Relevant bibliographies by topics / Corrosion chaude

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Corrosion chaude'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Corrosion chaude"

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Pagetti, J., M. Troquet, J. Y. Regnier, and L. Bon. "Nouvelle cellule électrochimique pour l’étude de la corrosion à chaud des métaux." Matériaux & Techniques 83, no. 12 (1995): 23–25. http://dx.doi.org/10.1051/mattech/199583120023.

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Khireddine, M. H. "Corrosion de tôles en acier galvanisé prélaquées empilées en milieu chaud et humide." Revue de Métallurgie 91, no. 9 (September 1994): 1284. http://dx.doi.org/10.1051/metal/199491091284.

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Morbioli, R., P. Steinmetz, and C. Duret. "Mécanismes de corrosion à chaud de revêtements d'aluminiures type NiAl en conditions aéronautiques." Materials Science and Engineering 87 (March 1987): 337–44. http://dx.doi.org/10.1016/0025-5416(87)90396-x.

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Carman, John G., Gordon Reese, Rodney J. Fuller, Timnit Ghermay, and Roger Timmis. "Nutrient and hormone levels in Douglas-fir corrosion cavities, megagametophytes, and embryos during embryony." Canadian Journal of Forest Research 35, no. 10 (October 1, 2005): 2447–56. http://dx.doi.org/10.1139/x05-173.

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Gymnospermous embryos are nourished by fluids secreted from the megagametophyte. During early embryony, these fluids occupy the newly formed corrosion cavity. We describe a novel method for extracting corrosion cavity fluid and provide chemical analyses based on extractions from approximately 120 000 Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) megagametophytes. Levels of potassium, phosphorus, calcium, zinc, and iron were higher in corrosion cavity fluid than in whole tissue, but levels of sulphur and manganese were lower. Levels of cyclitols, sucrose equivalents, erythrose, and arabinose were many-fold higher in corrosion cavity fluid than in whole tissues. Ala, Ser, Arg, Glx, and NH3 exceeded 80 mmol/kg dry mass in corrosion cavity fluid. These levels were about 100-fold higher than those found in whole tissues. During early embryony, hormone levels in corrosion cavity fluid were higher than levels observed in whole megagametophytes by 120-fold for indole-3-acetic acid, 53-fold for abscisic acid, and 8- to 10-fold for cytokinins. Nutrient and hormone levels tended to be much higher in the corrosion cavity fluid than would have been predicted based on whole-tissue analyses. Dynamic changes in nutrient and hormone levels occurred over time in the corrosion cavity, and these changes may normalize embryony in situ.
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Ladoux, G., and C. Mauhe. "20 Ans d'expérience en service sur le comportement à la corrosion des superalliages et de leur protection dans les parties chaudes des turbines à gaz industrielles." Materials Science and Engineering 88 (April 1987): 331–39. http://dx.doi.org/10.1016/0025-5416(87)90102-9.

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Trivedi, Nayruti Siddharth, Murali Sankar Venkatraman, Clement Chu, and Ivan S. Cole. "Effect of climate change on corrosion rates of structures in Australia." Climatic Change 124, no. 1-2 (March 15, 2014): 133–46. http://dx.doi.org/10.1007/s10584-014-1099-y.

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Bordiga, M., J. Henderiks, F. Tori, S. Monechi, R. Fenero, A. Legarda-Lisarri, and E. Thomas. "Microfossil evidence for trophic changes during the Eocene–Oligocene transition in the South Atlantic (ODP Site 1263, Walvis Ridge)." Climate of the Past 11, no. 9 (September 30, 2015): 1249–70. http://dx.doi.org/10.5194/cp-11-1249-2015.

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Abstract. The biotic response of calcareous nannoplankton to environmental and climatic changes during the Eocene–Oligocene transition was investigated at a high resolution at Ocean Drilling Program (ODP) Site 1263 (Walvis Ridge, southeast Atlantic Ocean) and compared with a lower-resolution benthic foraminiferal record. During this time interval, global climate, which had been warm under high levels of atmospheric CO2 (pCO2) during the Eocene, transitioned into the cooler climate of the Oligocene, at overall lower pCO2. At Site 1263, the absolute nannofossil abundance (coccoliths per gram of sediment; N g−1) and the mean coccolith size decreased distinctly after the E–O boundary (EOB; 33.89 Ma), mainly due to a sharp decline in abundance of large-sized Reticulofenestra and Dictyococcites, occurring within a time span of ~ 47 kyr. Carbonate dissolution did not vary much across the EOB; thus, the decrease in abundance and size of nannofossils may reflect an overall decrease in their export production, which could have led to variations in the food availability for benthic foraminifers. The benthic foraminiferal assemblage data are consistent with a global decline in abundance of rectilinear species with complex apertures in the latest Eocene (~ 34.5 Ma), potentially reflecting changes in the food source, i.e., phytoplankton. This was followed by a transient increased abundance of species indicative of seasonal delivery of food to the sea floor (Epistominella spp.; ~ 33.9–33.4 Ma), with a short peak in overall food delivery at the EOB (buliminid taxa; ~ 33.8 Ma). Increased abundance of Nuttallides umbonifera (at ~ 33.3 Ma) indicates the presence of more corrosive bottom waters and possibly the combined arrival of less food at the sea floor after the second step of cooling (Step 2). The most important changes in the calcareous nannofossil and benthic communities occurred ~ 120 kyr after the EOB. There was no major change in nannofossil abundance or assemblage composition at Site 1263 after Step 2 although benthic foraminifera indicate more corrosive bottom waters during this time. During the onset of latest-Eocene–earliest-Oligocene climate change, marine phytoplankton thus showed high sensitivity to fast-changing conditions as well as to a possibly enhanced, pulsed nutrient supply and to the crossing of a climatic threshold (e.g., pCO2 decline, high-latitude cooling and changes in ocean circulation).
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Bordiga, M., J. Henderiks, F. Tori, S. Monechi, R. Fenero, and E. Thomas. "The Eocene–Oligocene transition at ODP Site 1263, Atlantic Ocean: decreases in nannoplankton size and abundance and correlation with benthic foraminiferal assemblages." Climate of the Past Discussions 11, no. 3 (May 7, 2015): 1615–64. http://dx.doi.org/10.5194/cpd-11-1615-2015.

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Abstract. The biotic response of calcareous nannoplankton to environmental and climatic changes during the Eocene–Oligocene transition (~34.8–32.7 Ma) was investigated at high resolution at Ocean Drilling Program (ODP) Site 1263 (Walvis Ridge, South East Atlantic Ocean), and compared with a lower resolution benthic foraminiferal record. During this time interval, the global climate which had been warm during the Eocene, under high levels of atmospheric CO2 (pCO2), transitioned into the cooler climate of the Oligocene, with overall lower pCO2. At Site 1263, the absolute nannofossil abundance (coccoliths per gram of sediment; N g−1) and the mean coccolith size decreased distinctly across the E–O boundary (EOB; 33.89 Ma), mainly due to a sharp decline in abundance of large-sized Reticulofenestra and Dictyococcites, within ~53 kyr. Since carbonate dissolution did not vary much across the EOB, the decrease in abundance and size of nannofossils may highlight an overall decrease in their export production, which could have led to an increased ratio of organic to inorganic carbon (calcite) burial, as well as variations in the food availability for benthic foraminifers. The benthic foraminiferal assemblage data show the global decline in abundance of rectilinear species with complex apertures in the latest Eocene (~34.5 Ma), potentially reflecting changes in the food source, thus phytoplankton, followed by transient increased abundance of species indicative of seasonal delivery of food to the sea floor (Epistominella spp.; ~34.04–33.54 Ma), with a short peak in overall food delivery at the EOB (buliminid taxa; ~33.9 Ma). After Oi-1 (starting at ~33.4 Ma), a high abundance of Nuttallides umbonifera indicates the presence of more corrosive bottom waters, possibly combined with less food arriving at the sea floor. The most important signals in the planktonic and benthic communities, i.e. the marked decrease of large reticulofenestrids, extinctions of planktonic foraminifer species and more pronounced seasonal influx of organic matter, preceded the major expansion of the Antarctic ice sheet (Oi-1) by ~440 kyr. During Oi-1, our data show no major change in nannofossil abundance or assemblage composition occurred at Site 1263, although benthic foraminifera indicate more corrosive bottom waters following this event. Marine plankton thus showed high sensitivity to fast-changing conditions, possibly enhanced but pulsed nutrient supply, during the early onset of latest Eocene-earliest Oligocene climate change, or to a threshold in these changes (e.g. pCO2 decline, high-latitude cooling and ocean circulation).
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Hansen, Katrine Elnegaard, Jacques Giraudeau, Lukas Wacker, Christof Pearce, and Marit-Solveig Seidenkrantz. "Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay." Climate of the Past 16, no. 3 (June 22, 2020): 1075–95. http://dx.doi.org/10.5194/cp-16-1075-2020.

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Abstract. Baffin Bay is a semi-enclosed basin connecting the Arctic Ocean and the western North Atlantic, thus making out a significant pathway for heat exchange. Here we reconstruct the alternating advection of relatively warmer and saline Atlantic waters versus the incursion of colder Arctic water masses entering Baffin Bay through the multiple gateways in the Canadian Arctic Archipelago and the Nares Strait during the Holocene. We carried out benthic foraminiferal assemblage analyses, X-ray fluorescence scanning, and radiocarbon dating of a 738 cm long marine sediment core retrieved from eastern Baffin Bay near Upernavik, Greenland (Core AMD14-204C; 987 m water depth). Results reveal that eastern Baffin Bay was subjected to several oceanographic changes during the last 9.2 kyr. Waning deglacial conditions with enhanced meltwater influxes and an extensive sea-ice cover prevailed in eastern Baffin Bay from 9.2 to 7.9 ka. A transition towards bottom water amelioration is recorded at 7.9 ka by increased advection of Atlantic water masses, encompassing the Holocene Thermal Maximum. A cold period with growing sea-ice cover at 6.7 ka interrupts the overall warm subsurface water conditions, promoted by a weaker northward flow of Atlantic waters. The onset of the neoglaciation at ca. 2.9 ka is marked by an abrupt transition towards a benthic fauna dominated by agglutinated species, likely in part explained by a reduction of the influx of Atlantic Water, allowing an increased influx of the cold, corrosive Baffin Bay Deep Water originating from the Arctic Ocean to enter Baffin Bay through the Nares Strait. These cold subsurface water conditions persisted throughout the Late Holocene, only interrupted by short-lived warmings superimposed on this cooling trend.
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Li, Cong, Rong-tang Zhang, Jie-bing Zhu, Zhi-jun Liu, Bo Lu, Bin Wang, Yu-zhou Jiang, Jie-sheng Liu, and Ping Zeng. "Model test of the stability degradation of a prestressed anchored rock slope system in a corrosive environment." Journal of Mountain Science 17, no. 10 (October 2020): 2548–61. http://dx.doi.org/10.1007/s11629-019-5835-7.

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Dissertations / Theses on the topic "Corrosion chaude"

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Couture, Ludovic. "Etude de la corrosion à haute température d'alliages réfractaires en présence de sels alcalins lors de la conversion thermochimique de la biomasse." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00721749.

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Les carburants BtL (Biomass to Liquid) font partie des carburants alternatifs au pétrole dits de seconde génération car synthétisés à partir de biomasse solide (contenant de la lignocellulose). Le procédé de fabrication de tels carburants par voie thermochimique repose sur deux étapes successives : la gazéification de la biomasse suivie par un procédé de Fisher-Tropsch. Certains éléments contenus dans la biomasse comme les sels alcalins peuvent se retrouver après l'étape de gazéification et être à l'origine d'attaques sous forme de sels fondus et ainsi endommager les infrastructures. Le travail réalisé dans ce manuscrit consiste à simuler la corrosion de parois d'échangeur thermique en présence de sulfate et chlorure de sodium sous atmosphère de gazéification (CO/H2/CO2) très faiblement oxydante (~ 10−18 bar). Afin de comparer les résultats à ceux issus de la bibliographie, les essais ont également été conduits sous atmosphère fortement oxydante (Ar/O2). Les essais réalisés sur alliage chrominoformeur, HR-120 (38Ni-34Fe-25Cr) à une température de 900°C en présence de sulfate de sodium en milieu faiblement oxydant ont mise en évidence une corrosion de type catastrophique localisée et réversible de l'alliage. Le comportement de l'alliage aluminoformeur, 214 (76Ni-16Cr-4Al) apparaît plus protecteur dans des conditions similaires. En présence de chlorure de sodium, les deux alliages se comportent d'une manière totalement identique : corrosion catastrophique en milieu fortement oxydant et impact du sel négligeable sous atmosphère faiblement oxydante. Un chapitre remède prometteur a été développé en fin de manuscrit.
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Castillo, Montes Jaime. "Impacts des stratégies d'exploitation de réseaux intérieurs sur la durabilité de canalisations d'eau chaude." Phd thesis, Université de La Rochelle, 2011. http://tel.archives-ouvertes.fr/tel-00730705.

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Afin de maitriser la qualité d'eau dans les réseaux d'eau chaude sanitaire, des traitements de désinfection thermiques et chimiques sont utilisés. Ces traitements de désinfection peuvent avoir un impact sur la dégradation des canalisations. L'influence de l'addition d'hypochlorite de sodium et de l'augmentation de la température sur la vitesse et le mode de dégradation des canalisations en cuivre, acier galvanisé, PERT/Al/PERT et PVCc a été étudiée. Pour ceci, des essais de vieillissement accéléré ont été réalisés en conditions statiques et dynamiques. Afin de réaliser les essais en conditions dynamiques, un banc d'essais à échelle 1 a été conçu et construit.La chimie des solutions d'hypochlorite de sodium à des températures élevées (>50°C) est complexe, ceci a motivé la réalisation d'une étude complémentaire sur les espèces présentes en fonction du pH et la cinétique de décomposition des solutions d'hypochlorite de sodium. Cette étude a révélé que l'augmentation de la température de 50°C à 70°C à une valeur de pH donnée produit une diminution significative de la concentration en acide hypochloreux. De plus, la décomposition de l'hypochlorite de sodium en chlorates est accélérée par la présence de cuivre et elle peut devenir significative à partir de 50°C.Les essais de vieillissement réalisés sur les canalisations ont révélé que l'addition d'hypochlorite de sodium est pénalisante par rapport à la vitesse de dégradation du cuivre, acier galvanisé et PERT/Al/PERT. Cependant, la dégradation du PVCc ne semble pas se voir affectée par l'addition d'hypochlorite de sodium. L'élévation de la température de 50°C à 70°C paraît accélérer légèrement la dégradation du PERT/Al/PERT et du PVCc. En revanche, avec une chloration de 25 ppm en hypochlorite de sodium, le mode de corrosion du cuivre est uniforme à 70°C tandis qu'il est localisé à 50°C.Les conclusions de ces résultats peuvent être d'utilité pour la conception et la maintenance des réseaux d'eau chaude sanitaire.
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Sanviemvongsak, Tom. "Oxydation et corrosion à haute température de superalliages à base de nickel issus de la fabrication additive." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0066.

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La résistance à l’oxydation isotherme et cyclique de l’alliage 718 produit par le procédé de fusion sélective par faisceau laser (LBM) et par faisceau d’électrons (EBM) a été comparée à celle de l’alliage 718 forgé (AMS5662). Les essais d’oxydation isotherme à 850 °C sous air ont montré des tenues à l’oxydation similaires en termes de prise de masse et d’oxydation intergranulaire pour les trois alliages. L’effet de la rugosité sur les cinétiques d’oxydation a été quantifié et il a été démontré que la cinétique d’oxydation intergranulaire suit le modèle de Wagner de l’oxydation interne avec un contrôle partiel par la diffusion de Al en volume. Les essais d’oxydation cyclique à 900 °C ont montré une couche d’oxyde bien plus adhérente pour l’échantillon forgé que pour les échantillons LBM et EBM. Cela pourrait être dû à une quantité de soufre en solution plus importante dans les échantillons issus de la FA. La résistance à la corrosion chaude cyclique et à l’oxydation cyclique à 900 °C et 1100 °C de superalliages issus de la FA (Alliage A, IN738, C1023 et Hastelloy X) ont été comparées. Les essais réalisés sur le banc d’oxydation cyclique du CIRIMAT et sur le banc brûleur de Safran Helicopter Engine, ont montré des cinétiques de variation de masse similaires sur les deux bancs malgré les atmosphères très différentes, sauf pour les alliages fortement affectés par la corrosion chaude à 900 °C sur banc brûleur. Les alliages les plus sensibles à la corrosion chaude cyclique ont une plus faible teneur en Cr (Alliage A) et/ou une teneur élevée en Mo (C1023), et présentent de l’oxydation intergranulaire (Alliage A, C1023 et 738). Dans l’ensemble, pour les matériaux les plus denses, les résultats ne montrent pas de différences significatives entre les échantillons issus de la FA et ceux coulés, ce qui valide ces nouveaux procédés de fabrication du point de vue de la résistance à l’oxydation-corrosion à haute température
The resistance to isothermal and cyclic oxidation of alloy 718 produced by laser beam melting (LBM) and electron beam melting (EBM) was compared to that of wrought alloy 718 (AMS5662). Isothermal oxidation tests at 850 °C in air showed similar oxidation behaviour in terms of weight gain and intergranular oxidation for all three alloys. The effect of roughness on oxidation kinetics was quantified and it was shown that the intergranular oxidation kinetics follow Wagner's model of internal oxidation partially controlled by the volume diffusion of Al. Cyclic oxidation tests at 900 °C showed a much more adherent oxide layer for the wrought sample than for the LBM and EBM samples. This could be due to a higher amount of sulphur in solution in the AM samples. The resistance to cyclic hot corrosion and cyclic oxidation at 900 °C and 1100 °C of superalloys from AM (Alloy A, IN738, C1023 and Hastelloy X) were compared. The tests carried out on CIRIMAT’s cyclic oxidation rig and on Safran Helicopter Engine’s burner rig showed similar mass variation kinetics on the two rigs despite the very different atmospheres, except for alloys strongly affected by hot corrosion at 900 °C on the burner rig. The alloys most susceptible to cyclic hot corrosion have a lower Cr content (Alloy A) and/or a high Mo content (C1023), and exhibit intergranular oxidation (Alloy A, C1023 and 738). Overall, for the densest materials, the results do not show significant differences between the samples made by AM and the cast samples. These results validate the use of these AM Ni-based superalloys, as far as high temperature oxidation-corrosion is concerned
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Laurent, Barbara. "Compréhension du comportement en corrosion d’un acier austénitique inoxydable enrichi en silicium en milieu acide nitrique chaud et concentré." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEC003/document.

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L’objectif de ces travaux est de comprendre et modéliser le comportement en corrosion de l’acier Uranus S1N en milieu acide nitrique chaud et concentré. La littérature montre que cet acier présente un comportement en corrosion particulier, en comparaison à d’autres aciers comme l’acier 304L. Les aciers 304L et Uranus S1N ont une composition chimique similaire à l’exception du silicium (moins de 1% pour le 304L et 4% pour l’Uranus S1N). En milieu acide nitrique seul, l’acier 304L présente une vitesse de corrosion plus faible que celle de l’acier Uranus S1N. Cette tendance s’inverse lorsque l’on ajoute des ions oxydants au milieu. Les mécanismes physico-chimiques en jeu ne semblent pas clairement établis. On souhaite comprendre quel est l’effet de l’enrichissement en silicium conduisant à cette différence de comportement. Les phénomènes de réduction et d'oxydation sont comparés entre les deux aciers pour différentes conditions : acide nitrique pur, présence de vanadium pentavalent, présence de chrome hexavalent. On montre que la présence de Si diminue les cinétiques de réduction et donc empêche l'acier Uranus S1N de se trouver dans son domaine transpassif même en conditions très oxydantes. Puis la couche passive de l'acier Uranus S1N est étudiée à travers trois jeux d'expériences. D'une part ses caractéristiques thermodynamiques sont étudiées par la mesure du potentiel d'activation de l'acier. D'autre part, sa composition chimique, sa morphologie et sa structure sont mis en lumière par la correlation de différentes techniques in-situ et ex-situ cohérentes. Enfin, la rupture de passivité à haut potentiel est observée car le Si est suspecté responsable de la disparition de l'attaque intergranulaire. Ces trois axes d'études de l'oxyde protecteur de l'acier Uranus S1N font appel à des techniques in-situ originales comme l'Atomic emission spectro electrochemistry permettant de coupler la mesure électrochimique à l'analyse élémentaire en ligne, mais également à des techniques d'analyses ex-situ telles que la spectroscopie à photoélectrons X ou la spectroscopie d'énergie dispersive sur lame mince
This work aims at understanding the corrosion behavior of the Uranus S1N stainless steel (SS) in hot and concentratred nitric acid. The Uranus S1N SS is a 304L type SS (18Cr-15Ni) added by 4 wt.% of Si. In pure nitric acid, the 304L SS dissolves slower. In other words, Si enhances the corrosion rate of the SS. But when oxidizing species are added, the 304L dissolves at a much higher rate than the Uranus S1N. Mecanisms involving Si that bring to this phenomenon are not clearly established. The purpose of this thesis project is to elucidate the role of Si in the spontaneous corrosion of the SS in pure nitric acid and in presence of oxidizing species. Reduction and oxydation phenomena are compared, through I-V curves measurements, between both steels, for different conditions : pure nitric acid, presence of pentavalent vanadium, hexavalent chromium. It was shown that Si diminishes the reduction kinetics and prevents the Uranus S1N SS to be shifted to its transpassive domain even when conditions are largely oxidizing. Then the oxide layer was investigated through three sets of experiments. Firstly, thermodynamics of the oxides where characterized by measuring the activation potential of the SS. Secondly, their chemical composition, thickness and structure were investigated coupling congruent in-situ and ex-situ measurements. Eventually, high potential passivity breakdown was investigated to understand why Si inhibits the intergranular attack at the surface. These three investigations rely on coupling original in-situ techniques as the atomic emission spectroelectrochemistry (electrochemical measurements coupled to elemental on line analysis) and ex-situ surface analysis as X-Ray photoelectron spectroscopy or Energy dispersive X-ray spectroscopy on cross-section thin blades
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Colot, Daniel. "Corrosion à chaud d'aciers réfractaires application aux chaudières à charbon pulvérisé /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376129565.

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Colot, Daniel. "Corrosion à chaud d'aciers réfractaires : application aux chaudières à charbon pulvérisé." Compiègne, 1988. http://www.theses.fr/1988COMPD111.

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L'étude du comportement d’aciers réfractaires dans un domaine de température compris entre 450°C et 850°C a montré que les aciers ferritiques contenant 8 à 9 % de Cr sont sensibles à la corrosion par les sels fondus qui se forment dans les dépôts cendreux à la surface des tubes d’échangeurs thermiques. Aux températures inférieur à 600°C, domaine de stabilité des trisulfates liquides (Na,K)3 Fe (SO4)3, la corrosion est gouvernée par la sulfuration du Cr de la couche interne des produits de corrosion. Entre 600 et 700°C, la disparition de la phase liquide, liée à la décomposition thermique des trisulfates entraine une diminution de la corrosion en fonction de la température. Aux températures supérieures à 700°C, la corrosion de ces aciers devient catastrophique. Les silicates et les sulfates de métaux alcalins fondus entrainent un mécanisme de corrosion dans les sels fondus, caractérisé par la destruction des couches d’oxydes protectrices. En ce qui concerne les aciers plus riches en Cr (25 Cr – 20 Ni) et (25 Cr – 4 Al) leur corrosion apparaît seulement aux températures supérieures à 700°C. Il semble que la présence de composés à base de silice soit responsable de cette corrosion par scorification de la couche superficielle d’oxydes.
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Ranaivoarisoa, Aimé. "Etude des couplages entre les processus de fatigue-corrosion et corrosion sous contrainte d'un acier inoxydable austénitique en milieu chloruré chaud." Bordeaux 1, 1994. http://www.theses.fr/1994BOR10655.

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L'etude de la relation entre la corrosion sous contrainte et la fatigue-corrosion basse frequence d'un acier inoxydable austenitique en milieu chlorure est effectuee relativement aux processus d'amorcage et de propagation des fissures. L'influence de la vitesse de deformation macroscopique (liee a la frequence de sollicitation) sur les differents processus est mise en evidence. L'ensemble des resultats permet ainsi de determiner une frontiere entre les deux phenomenes en terme de vitesse de deformation critique. Une etude fractographique des facies de rupture permet de proposer une schematisation de la frontiere a partir de l'evolution de la morphologie du mode de fissuration suivant la frequence de sollicitation
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Rothea, Rémi. "Etude par la technique d’émission acoustique de la corrosion sous contrainte des aciers inoxydables austénitiques en milieu chlorure chaud." Lyon, INSA, 1990. http://www.theses.fr/1990ISAL0024.

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Le phénomène de fissuration sous contrainte, très redouté dans la pratique industrielle en raison de sa complexité et de ses conséquences économiques, fait l'objet dans ce travail, d'une étude par la technique d'émission acoustique. Cette technique s'avère être un outil puissant non seulement pour le suivi de la propagation des fissures, mais aussi pour l'investigation des mécanismes fondamentaux de la corrosion sous contrainte. Après une revue critique des résultats de la littérature mettant en évidence les difficultés spécifiques au cas industriellement important des aciers inoxydables austénitiques en milieu chloruré chaud (MgC12 44% 145°C), les différentes sources d'émission acoustique en présence sont identifiées et caractérisées expérimentalement : ébullition, dégagement d'hydrogène, dépassivation locale, déformation plastique, propagation de fissures. Les valeurs des paramètres intervenant dans les essais de traction lente et de traction pulsée sont alors optimisées pour obtenir une fissuration fiable, reproductible et représentative des cas rencontrés dans la pratique. Une étude micro-fractographique met en évidence des aspects caractéristiques des faciès de rupture autorisant ainsi une meilleure compréhension des mécanismes de corrosion sous contrainte et des transitions de mode de fissuration trans-inter-granulaire. La mise au point d'une chaîne d'acquisition numérique rapide des signaux d'émission acoustique et la mise en œuvre d'une géométrie spéciale d'éprouvette et de capteur permettent d'améliorer la sensibilité de détection. Des logiciels de traitement des signaux sont développés pour calculer en temps différé l'énergie,la fréquence et la localisation des sources d'émission. L'influence, sur les caractéristiques des signaux et sur le mode de rupture, de cinq paramètres expérimentaux est particulièrement étudiée : la nature de l'environnement, sa température, le taux de déformation, la pureté de l'acier et la nature du tenseur des contraintes en fond de fissure. Un mécanisme différent de fissuration est retenu selon le mode de rupture observé.
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Amor, Zakia. "Suivi de l'endommagement en corrosion sous contrainte des aciers inoxydables austénitiques, en milieu chloruré chaud, par la méthode d'impédance électrochimique." Bordeaux 1, 1989. http://www.theses.fr/1989BOR10552.

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Application, dans le cas de deux aciers inoxydables austenitiques (aisi 304l et 316l) en milieu chlorure concentre, de la methode d'impedance electrochimique a la detection du passage entre la phase d'amorcage et la phase de propagation des fissures
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Tinani, Suraj P. "Techniques to Analyze Underdeposit Corrosion." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1272643724.

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Books on the topic "Corrosion chaude"

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Głuszek, Józef. Rôle des films passifs dans le processus de corrosion sous contrainte des aciers inoxydables 18-10 dans les solutions chlorurées chaudes. Wrocław: Wydawn. Politechniki Wrocławskiej, 2000.

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Radchenko, Tat'yana, and Yuriy Shevcov. The creation of protective and strengthening coatings by methods of electron beam processing in vacuum. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1000599.

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This monograph presents basic theoretical and applied issues of the process of electron beam heat treatment, cladding and welding in various industries. Reviewed hardware and technological aspects, peculiarities of formation of structure of metals and alloys, as well as the patterns of change of such physical-mechanical properties, such as hardness, wear resistance, corrosion resistance, thermal conductivity. The specific examples of the electron beam to create a strengthening and protective coatings. Can be recommended as a textbook for students of technical universities, engineers and researchers and practical workers in the field of welding production.
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Svallfors, Stefan. Who Loves the Swedish Welfare State? Attitude Trends 1980–2010. Edited by Jon Pierre. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199665679.013.2.

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Attitudes toward social spending, collective financing, and public organization, willingness to pay taxes, suspicion about welfare abuse, and trust in the task performance of the welfare state show a large degree of stability in Sweden, and where change is registered, it tends to go in the direction of increasing support. More people state their willingness to pay higher taxes for welfare policy purposes; more people want collective financing of welfare policies; and fewer people perceive extensive welfare abuse. Class patterns change so that the salaried and the self-employed become more similar to workers in their attitudes. Hence, no attitudinal corrosive effects from increased marketization of the Swedish welfare state can be detected on public support for welfare policies.
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Pérez López, Tezozomoc, Hosefa A. Paat Estrella, Francisco Javier Barrera Lao, and Gabriela P. Aldana, eds. IX Congreso Nacional ALCONPAT 2020. EPOMEX-UAC, 2020. http://dx.doi.org/10.26359/alconpat2020.

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The construction industry is an indicator of economic development: in good times both individuals and companies invest to increase or improve their houses and facilities. The halted construction is an indication of economic difficulties. Hence the importance of protecting infrastructure investments through diagnostic, recovery and construction rehabilitation procedures. IX National Congress ALCONPAT Mexico 2020 addressed the thematic axes: Materials and nanomaterials, Durability and sustainability, Preservation of built heritage, Preservation, maintenance and rehabilitation, Semi and non-destructive tests, Corrosion in concrete structures, Climate Change. Four Plenary Conferences were presented, given by renowned researchers from Spain, Colombia, Mexico and Argentina. Nine Master Conferences were also presented, given by Researchers from the Autonomous University of Nuevo León, Veracruzana University, CNIC of Havana, Cuba and the Autonomous University of Campeche. 61 papers were received, divided into: 35 oral presentations 26 poster presentations. The participating institutions were: Universidad Autónoma de Campeche, Universidad Autónoma de Nuevo León, Universidad Veracruzana, Universidad Autónoma del Estado de Hidalgo, Tecnológico Nacional de México (Instituto Tecnológico de Chetumal), Universidad Autónoma de Chiapas, Cinvestav Unidad Mérida, Universidad Autónoma de Yucatán , Universidad Michoacana de San Nicolás de Hidalgo, Universidad Juárez Autónoma de Tabasco, CIIDIR IPN Campus Oaxaca, Centro Nacional de Investigaciones Científicas de Cuba, Consultor Independiente de Ecuador, Centro Internacional de Matemáticas Numéricas e Ingeniería (España), Universidad Nacional del Sur ( Argentina). Effort and enthusiasm of the participants to carry out the event in virtual mode, due to the existing adverse sanitary conditions, stands out. It is one more indication of the strength of the ALCONPAT community in maintaining the continuity of one of its activities to exchange knowledge and experiences for the improvement of practices aimed at prolonging the durability of the infrastructure.
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de Melo-Martín, Inmaculada, and Kristen Intemann. The Fight Against Doubt. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190869229.001.0001.

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Current debates about climate change or vaccine safety provide an alarming illustration of the potential impacts of dissent about scientific claims. False beliefs about evidence and the conclusions that can be drawn from it are commonplace, as is corrosive doubt about the existence of widespread scientific consensus. Deployed aggressively and to political ends, ill-founded dissent can intimidate scientists, stymie research, and lead both the public and policymakers to oppose important policies firmly rooted in science. To criticize dissent is, however, a fraught exercise. Skepticism and fearless debate are key to the scientific process, making it both vital and incredibly difficult to characterize and identify dissent that is problematic in its approach and consequences. Indeed, as de Melo-Martín and Intemann show, the criteria commonly proposed as means of identifying inappropriate dissent are flawed, and the strategies generally recommended to tackle such dissent are not only ineffective but could even make the situation worse. The Fight against Doubt proposes that progress on this front can best be achieved by enhancing the trustworthiness of the scientific community and being more realistic about the limits of science when it comes to policymaking. It shows that a richer understanding is needed of the context in which science operates so as to disarm problematic dissent and those who deploy it in the pursuit of their goals.
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Book chapters on the topic "Corrosion chaude"

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Wranglén, Gösta. "Corrosion protection by change in the corrosive medium." In An Introduction to Corrosion and Protection of Metals, 165–73. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4850-1_13.

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Wranglén, Gösta. "Corrosion protection by change of the electrode potential metal/corrosive medium." In An Introduction to Corrosion and Protection of Metals, 174–84. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4850-1_14.

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Barry, Dana M., and Hideyuki Kanematsu. "Change from Metals to Nonmetals." In Corrosion Control and Surface Finishing, 271–80. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55957-3_24.

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Hayat, Muhammad Aamer, and Yong Chen. "A Brief Review on Nano Phase Change Material-Based Polymer Encapsulation for Thermal Energy Storage Systems." In Springer Proceedings in Energy, 19–26. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_3.

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AbstractIn recent years, considerable attention has been given to phase change materials (PCMs) that is suggested as a possible medium for thermal energy storage. PCM encapsulation technology is an efficient method of enhancing thermal conductivity and solving problems of corrosion and leakage during a charging process. Moreover, nanoencapsulation of phase change materials with polymer has several benefits as a thermal energy storage media, such as small-scale, high heat transfer efficiency and large specific surface area. However, the lower thermal conductivity (TC) of PCMs hinders the thermal efficiency of the polymer based nano-capsules. This review covers the effect of polymer encapsulation on PCMs while concentrating on providing solutions related to improving the thermal efficiency of system.
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Wranglén, Gösta. "Corrosion protection by change of metal and by design." In An Introduction to Corrosion and Protection of Metals, 147–64. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4850-1_12.

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Maria Segers, John Paul. "Corrosion Management - The Key to Sustainable Development of Marine Structures." In Coasts, marine structures and breakwaters: Adapting to change, 2: 708–716. London: Thomas Telford Ltd, 2010. http://dx.doi.org/10.1680/cmsb.41318.0072.

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Bastidas-Arteaga, Emilio, and Mark G. Stewart. "Climate change impact on RC structures subjected to chloride ingress and carbonation-induced corrosion." In Routledge Handbook of Sustainable and Resilient Infrastructure, 626–45. Abingdon, Oxon ; New York, NY : Routledge, 2019. |: Routledge, 2018. http://dx.doi.org/10.4324/9781315142074-32.

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Salgado, Rebeca, Hoda Akbari, Maria C. Brown, Isobelle Reid, and Sarah J. McCormack. "Study of Corrosion Effect of Micronal® Phase Change Materials (PCM) with Different Metal Samples." In Renewable Energy and Sustainable Buildings, 709–17. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18488-9_57.

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Herrera Hernández, Héctor, Adriana M. Ruiz Reynoso, Juan C. Trinidad González, Carlos O. González Morán, José G. Miranda Hernández, Araceli Mandujano Ruiz, Jorge Morales Hernández, and Ricardo Orozco Cruz. "Electrochemical Impedance Spectroscopy (EIS): A Review Study of Basic Aspects of the Corrosion Mechanism Applied to Steels." In Electrochemical Impedance Spectroscopy. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94470.

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AC impedance measurements have been applied for over twenty years in electrochemistry and physics to investigate the electrical properties of conductive materials and their interfaces using an external electrical impulse (VOLTAGE, V or CURRENT, I) as driving force. Furthermore, its application has recently appeared to be destined in the Biotechnology field as an effective tool for rapid microbiologic diagnosis of living organism in situ. However, there is no doubt that the electrochemical impedance spectroscopy (EIS) is still one of the most useful techniques around the world for metal corrosion control and its monitoring. Corrosion has long been recognized as one of the most expensive stumbling blocks that concern many industries and government agencies, because it is a steel destructive phenomenon that occurs due to the chemical interaction with aqueous environments and takes place at the interface between metal and electrolyte producing an electrical charge transfer or ion diffusion process. Consequently, it is experimentally possible to determine through the EIS technique the mechanism and control that kinectics of corrosion reactions encounter. First, EIS data is collected through a potentiostat/galvanostat apparatus. After, it is fitted to a mathematical model (i.e. an equivalent electrical circuit, EEC) for its interpretation and analysis, fundamentally seeking a meaningful physical interpretation. Finally, this review reports some basic aspects of the corrosion mechanism applied to steels through the experimental EIS response using Nyquist or Bode plots. Examples are given for different applied electrochemical impedance cases in which steel is under study intentionally exposed to a corrosive aqueous solution by applying a sinusoidal potential at various test conditions.
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Almzarzie, Khuloud, Ayman Almassri, Ahmad Falah, and Hassan Kellawi. "Electrochemical, Thermodynamic, Surface, and Spectroscopic Study in Inhibition of Iron Corrosion with Turmeric Root Extract (TRE)." In Electrochemical Impedance Spectroscopy. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92648.

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Turmeric root extract was tested as corrosion inhibitor for iron in 0.5 M HCl, using potentiodynamic polarization and electrochemical impedance spectroscopy, scanning electron microscope, and energy dispersive X-ray analysis. The inhibition efficiency increases as the time of immersion rises but decreases with temperature rise. The Nyquist plots showed that the charge transfer resistance increases and the double-layer capacitance decreases as the time of immersion increases. Tafel results show that both corrosion current and corrosion speed are reduced with time of immersion. All impedance spectra of EIS tests exhibit one capacitive loop, which indicates that the corrosion reaction is controlled by charge transfer process. Inhibition efficiency increases with the concentration of the inhibitor reaching its maximum value, 88.90%, at 8 g/100 mL. Thermodynamic parameters, Ea, ∆H*, and ∆S*, were estimated, and the mechanism of corrosion and inhibition was discussed. The adsorption of turmeric root extract followed Langmuir adsorption isotherm.
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Conference papers on the topic "Corrosion chaude"

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Durnie, William H., and Don Harrop. "Using Modelling & Data Analytics to Signal Change - Can we Avert a 'Midlife Crisis'." In SPE International Oilfield Corrosion Conference. Society of Petroleum Engineers, 2008. http://dx.doi.org/10.2118/114115-ms.

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Shi, Xiang, Julia R. de Rezende, and Kenneth Sorbie. "Microbial Ecology Metrics to Assess the Effect of Biocide on Souring Control and Improve Souring Modelling." In SPE International Oilfield Corrosion Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205037-ms.

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Abstract Reservoir souring is a long-standing issue for the oil and gas industry caused by sulfate-reducing microorganisms (SRM) producing H2S from sulfate ions. In this work, we investigated the connections between the development of souring and the change in three key microbial ecology metrics: the abundance, alpha diversity and community structure of a souring microbiota under the biocide treatment of 100 ppm glutaraldehyde (henceforth referred to as GA). These are studied in sand-packed flow-through bioreactors during and after the biocide treatment using cutting-edge DNA assays. Our study suggests that the rebound of microbial sulfide production after the 100 ppm GA treatment is closely associated with the recovery in microbial abundance and microbial alpha diversity. The study also shows that 100 ppm GA treatment may lead to a measurable shift in the SRM community structure. By comparing the effluent microbial community with the sand microbial community, the study suggests that the change in alpha diversity of the produced water microbial community might be an early warning for the sulfide breakthrough due to souring recurrence in practice. This work explores the relationship between souring and the underlining microbial community behaviours in response to the 100 ppm GA treatment and, to characterise these changes, we propose measurable metrics. A conceptual model is also proposed describing the near-term biological process behind the biocide treatment-recovery cycle in a souring scenario. Finally, this work highlights the potential applications and caveats of harnessing the increasingly available field microbial community data for the improvement of souring modelling and field souring control strategies.
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Tsao, Pei-Haw, Hung-Yu Chiu, H. C. Liao, K. C. Chen, M. C. Sung, Worth Chen, and Antai Xu. "Investigation of charge induced bond pad corrosion." In 2013 IEEE 63rd Electronic Components and Technology Conference (ECTC). IEEE, 2013. http://dx.doi.org/10.1109/ectc.2013.6575777.

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Shopov, Antonio, Borislav Bonev, and Nikolay Brayanov. "Change of spring constant for springs with corrosion." In Fifth International Conference on Road and Rail Infrastructure. University of Zagreb Faculty of Civil Engineering, 2018. http://dx.doi.org/10.5592/co/cetra.2018.900.

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AL-Yasiri, Mortatha Saadoon. "Erosion Corrosion of Drill Pipe During Drilling Operations." In SPE International Oilfield Corrosion Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205044-ms.

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Abstract The presence of high rotating speeds and weights, the corrosiveness of water-based drilling muds, and high-speed mud with embedded cuttings, exposing drill string components to severe wear and corrosion that reduce their service life. The drill pipe erosion, abrasive wear and corrosion depend on properties of drilled cuttings and drilling fluids. Any variation in these properties leads to change in pipe degradation rate. There is a need to study the effect of individual factors, for expecting the drill pipe series life and to find a solution to this challenging problem. This research aims to evaluate the influence of real rock cuttings sizes and concentration as well as we investigate the effect of base fluid type on the erosion-corrosion rate. Actual drilled cuttings have been sieved to get three sizes of erodent cuttings; namely, 0.841 to 3.3 mm. Experiments are done with three sand concentrations (5%, 10% and 15%). The rate of erosion-corrosion of the drill pipe specimens is measured as the loss of weight per unit surface area per unit time under the dynamic action of solid particles. The eroded surfaces of the specimens are examined using Scanning Electron Microscopy (SEM) to visualise the impact of the drill cuttings at various conditions. It is seen that the rate of corrosion/erosion decreases with the increase of drilled cuttings concentration. Also, high erosion-corrosion rate is detected in situation of large drill cuttings particles. In this research, we explored a novel simple technique to simulate pipe erosion-corrosion in a reservoir-like environment. Furthermore, this paper proposed a new approach to control drill pipe erosion-corrosion by using SiO2-nanofluid.
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Liu, Liqiang, Xianjue Luo, Tao Niu, and Kai Wang. "Grounding Grid Corrosion Diagnosis Based on Large Change Sensitivity." In 2009 Fifth International Conference on Information Assurance and Security. IEEE, 2009. http://dx.doi.org/10.1109/ias.2009.241.

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Nogal, Maria, Emilio Bastidas-Arteaga, and Helena Maria dos Santos Gervásio. "Consideration of climate change-induced corrosion by structural codes." In IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.1064.

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<p>The impact of climate change on ambient temperature and relative humidity along with the present CO2 levels are speeding the corrosion process of reinforced concrete structures. The alarming cost of the associated reduction of the service life of structures, which is estimated to cost 3% to 4% of the Gross Domestic Product (GDP) of industrialized countries, has put the spotlight on the importance of introducing the issue of climate change on the new generation of Eurocodes. Amongst the strategies to tackle the problem, design-phase measures seem not to be always cost- effective, nevertheless, measures during service-life are generally the most expensive. This paper discusses the potential strategies to be addressed by structural codes to tackle the problem of climate change-induced corrosion, considering aspects such as the cost-benefit analysis, viability, and the large uncertainty involved in climate change evolution.</p>
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Chen, Junyu, and Weiping Zhang. "Modeling the interaction between non-uniform corrosion of rebar and corrosion-induced cover cracking." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.1947.

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<p>Circumferential non-uniform corrosion of rebars in concrete normally occurs in marine environment, and has an adverse impact on corrosion-induced cover cracking which may conversely change the circumferential corrosion profile. This paper investigates the interaction between chloride-induced non-uniform corrosion and corrosion-induced cover cracking. A chloride penetration model is introduced to predict the distribution of chloride content in concrete, which can determine the corrosion initiation time around the circumferential surface of a rebar. Subsequently, the time-dependent corrosion rate around the rebar surface can be calculated based on electrochemical theory, and then the corrosion profile at different time can be deduced. With the cross-sectional corrosion profile as an input, a mechanical model for corrosion-induced cover cracking can be utilized to simulate the development of surface crack, which has a significant influence on the diffusion of chloride ions and oxygen and may change the corrosion process. The derived model is verified with experimental results, and then a case study is conducted to demonstrate the time-varying non-uniform corrosion profile. Numerical simulation results indicate that, compared with uniform corrosion, non-uniform corrosion can lead to earlier cover cracking and faster development of surface crack width.</p>
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Stack, M. M., J. Rodling, and M. T. Mathew. "Micro-Abrasion-Corrosion Mapping of Bio-Materials: Some New Perspectives." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64156.

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Recent developments in the studies of micro-abrasion have resulted in the construction of mechanistic maps where the change in micro-abrasion is presented as a function of the main tribological parameters. However, in many practical situations where micro-abrasion occurs, the environment tends to be corrosive. In such cases, the interaction of micro-abrasion and corrosion is of interest because the combined interaction may lead to “synergistic” or “antagonistic” effects, where corrosion may have a deleterious or beneficial effect in modifying the mechanical properties of the surface. In this paper, the micro-abrasion of a Co-Cr specimen against an ultra high molecular weight polyethylene (UHMWPE) ball was studied in Ringers solution. The effects of applied load at a range of electrochemical potentials were investigated. Atomic force and scanning electron microscopy techniques were used to identify the extent of wear and the role of the corrosion film on the micro-abrasion rate enabling the various wear, corrosion and the interactive effects to be evaluated for the system. The results showed that various micro-abrasion-corrosion mechanisms could be identified in active and passive conditions. These were used to generate micro-abrasion-corrosion mechanism maps showing the change in mechanism as functions of load and applied potential and the extent of interaction between the wear and the corrosion processes was demonstrated on such maps. Possible uses of the generic form of these maps to identify micro-abrasion-corrosion mechanisms in other bio-medical applications are addressed in this paper.
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Singh, Kumar V., Carter Hamilton, and Steven Boehmer. "Characterization and Estimation of Mass Loss Due to Exfoliation Corrosion From Vibration Spectrum." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67486.

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Corrosion is a major concern to the aerospace community when evaluating the structural integrity and service-life potential of an airframe. The estimation of corrosion and characterization of material parameters due to such corrosion is of the paramount interest. In this study, corrosion characterization and estimation is considered by using vibration spectrum that can be obtained from non-destructive testing. To that end, aluminum 7075-T6 extrusions were exposed to the exfoliation corrosion environment specified in ASTM G 34 for various times, and the resultant mass loss was measured for each exposure. The corrosion attack was confined to a narrow band centered on the length of a beam specimen by masking the extrusion. Theoretical modeling and lab scale dynamic testing were conducted to establish the correlation between the mass loss and the associated spectral characteristics of the beam (natural frequencies). This research program demonstrates that changes in mass due to exfoliation corrosion may be identified by the measurable change in the spectrum. Estimation/characterization techniques based upon a low dimensional mathematical model as well as based only upon experimental data (natural frequencies) are developed. Successful non-destructive dynamic characterization of aluminum extrusions, therefore, can be the basis of corrosion evaluation and health monitoring of structures operating in corrosive environments.
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