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Letteratura scientifica selezionata sul tema "Corrosion efficiency"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 7 febbraio 2022

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Articoli di riviste sul tema "Corrosion efficiency"

Strachotová, K. C., M. Kouřil, K. Kuchťáková e Š. Msallamová. "Inhibition efficiency of sodium salts of carboxylic acids on corrosion of lead in archive environment". Koroze a ochrana materialu 63, n. 1 (1 marzo 2019): 37–47. http://dx.doi.org/10.2478/kom-2019-0005.

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Abstract Lead in archive environment suffers from severe corrosion attack caused by the organic acids’ vapours usually presented in such an environment. One of possible ways of corrosion protection of lead is its surface treatment by solutions of sodium salts of monocarboxylic acids (general formula CH3(CH2)n-2COONa, noted NaCn, n = 10, 11, 12). The principle of this corrosion protection is a creation of conversion coating on the lead’s surface, which decreases corrosion rate of lead in the atmospheric environment polluted by organic acids’ vapour. Our research aims at the selection of a suitable protection system that would be applicable to conservation of historical lead in archives and museums. This paper evaluates the corrosion behaviour of treated lead based on the values of polarisation resistance and shape of potentiodynamic curves in simulated corrosive environment (0.01 mol l−1 solution of acetic acid). The lead samples with different state of surface (pure, corroded and electrochemically cleaned) were treated with sodium salts of monocarboxylic acids NaCn (n = 10, 11, 12) having concentration of 0.01 and 0.05 mol l−1. In simulated corrosive atmosphere (above 0.001 mol l−1 acetic acid solution vapours), corrosion rate was measured by means of electrical resistance technique. The inhibition efficiency of monocarboxylic acids is dependent on their carbon chain length and their concentration. The greatest inhibiting efficiency in corrosive atmospheres and for all lead samples was observed for the sodium salt of dodecanoic acid having concentration of 0.05 mol l−1. Artificially created corrosion products and salt coatings were analysed by X-ray diffraction analysis and their surface morphology was observed by scanning electron microscopy. A protective salt coatings are mainly composed of metallic soaps in dimer form.

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Hou, Zhen Bo, Tian Hao Li, Xian Wei Lv e Bing Ge Fu. "Influence of Imidazoline Inhibitor on CO₂ Corrosion of N80 Steel in Annulus Zone of Pump Recovery Well". Advanced Materials Research 1061-1062 (dicembre 2014): 49–54. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.49.

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The impact of CO2 partial pressure ,fluid producing rate and corrosive medium on the CO2 corrosion regularity of N80 steel and the inhibition efficiency of imidazoline inhibitor are investigated respectively through simulation of the actual working environment in the mined-out space of mechanical oil production wells by using high temperature and pressure reactor. According to the results, the corrosion rate of metals increases with CO2 partial pressure but the inhibition efficiency of the inhibitor is hardly affected when CO2 partial pressure in the scope of 1~3MPa. The increase of the fluid producing rate will accelerate the corrosion of metals and the inhibition efficiency will decline. With corrosion inhibitor applied, metals corrode slower in the liquid phase than in the gas in the initial stage, but latterly the corrosion rate is gradually higher than that in the gas phase.

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Augustin, M., e M. Ščerbejová. "Anticorrosive efficiency of preservants for farming machinery". Research in Agricultural Engineering 49, No. 1 (8 febbraio 2012): 22–26. http://dx.doi.org/10.17221/4947-rae.

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Selected anticorrosion preserving agents were subjected to a comparison on the basis of tests made under operating conditions. Resistance of materials to corrosion markedly varies with operating conditions and impact of outer environment with the most important factors influencing the corrosion rate being SO<sub>2</sub> content, temperature and humidity. Relative protective efficiency of preserving agents was assessed on the basis of weight losses of protected and unprotected samples. It was found out that the material’s resistance to corrosion is significantly depending on warehousing conditions (SO<sub>2</sub>, temperature, humidity, etc.) and on the quality of the applied preservant. Depending on various environments, the values of relative protective efficiency of water-soluble preservant and preserving agent based on vegetable oils were ranging from 38–87% and 47–75%, respectively.

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Ushakov, I. A., V. S. Nikonova, I. V. Polynskii, L. G. Knyazeva, M. M. Polynskaya e E. A. Antsiferov. "Study on efficiency of corrosion inhibitors based on derivatives of isothiuronic salts". Proceedings of Universities. Applied Chemistry and Biotechnology 11, n. 2 (4 luglio 2021): 326–32. http://dx.doi.org/10.21285/2227-2925-2021-11-2-326-332.

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Metals play a pivotal role in industry; their use constantly grows. It is virtually impossible to find an industrial field without the use of metals and their alloys. However, owing to the quality degradation of metal during the operational process, corrosion appears not only on its surface but also under a coating, which leads to its destruction. To avoid this, corrosion inhibitors are necessary. Organic compounds have been widely used as corrosion inhibitors. Many organic corrosion inhibitors have been developed nowadays. In the literature, organic compounds comprising N, O, S and P heteroatoms are described, which reduce corrosion rate. The organic compounds are adsorbed on the metal surface, forming a thin layer. Adsorption occurs either through electrostatic interaction or, in some cases, the formation of covalent bonds. The work aimed to study isothiuronic salts as corrosion inhibitors to evaluate their protective properties using the polarisation curves method. Objects of research were isothiuronic compounds containing two active centres separated by saturated and unsaturated carbon bonds (structures 1-3). In structures 4-7, one isothiuronic fragment has different propylene substituting groups. It has been previously shown that these compounds can act as effective brightening agents when applying nickel coatings. A model solution with a density of 1.12 g/cm3 was prepared to study the corrosion inhibitors. The corrosion inhibitor concentration was 400 mg/L. Studies have shown that the compounds with two isothiuronic moieties do not always exhibit improved properties for inhibiting metal degradation in a corrosive environment. In particular, they showed worsening of the inhibiting properties for samples made of steel 20 and identical properties for that made of steel 3.

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Yang, Na, Qin Liao, Qing Li, Peng Zhang e Longqin Li. "Simple and easy-operated method for filtering eco-friendly corrosion inhibitors". Anti-Corrosion Methods and Materials 63, n. 2 (7 marzo 2016): 73–81. http://dx.doi.org/10.1108/acmm-07-2014-1406.

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Purpose – The purpose of this paper was to find a simple and easy-operated method for filtering eco-friendly corrosion inhibitors. Design/methodology/approach – The molecular structures and atomic electronegativities of the four kinds of natural reagents, iota-Carrageenan, sodium alginate, sodium dodecanesulphonate (SDS) and sodium dodecylbenzene sulfonate were calculated by Gaussian and Natural Bond Orbital, and the corrosion inhibition rates were forecasted by the calculated results. Then, the realistic corrosion inhibition efficiency were confirmed by electrochemical impedance spectroscopy and potentiodynamic polarization tests in 3.5 Wt.% sodium chloride corrosive solutions. At the same time, the function of pefloxacin mesylate (PM) was explored in this paper polarization tests in 3.5 Wt.% sodium chloride corrosive solutions. Findings – Results showed that the order calculated by the chemical software was correct, and the corrosion inhibition of SDS was the best. Optimum addition of PM not only can reduce microbial corrosion but also can improve the corrosion inhibition by spatial cooperation. Practical implications – This method can be used to filter eco-friendly corrosion inhibitors quickly. PM can be also used to improve the corrosion inhibition rate of corrosion inhibitors. Originality/value – The present method to filter corrosion inhibitors was time-consuming, which needed lots of experiments to verify the corrosion inhibitive efficiency. The calculated method was simpler than others, which need complicated calculation process.

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Taranza, Luboš, e Rostislav Drochytka. "Verification of the Efficiency of Anti-Corrosion Systems for Reinforced Concrete Constructions in a Laboratory Environment". Applied Mechanics and Materials 357-360 (agosto 2013): 876–79. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.876.

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Corrosion of steel constructions due to the affection of aggressive agents is one of the principal problems affecting reinforced concrete constructions. In critical cases, this phenomenon may cause static destabilisation of the construction and as a result, it is necessary to protect constructions using primary and secondary protection which significantly decreases this risk. This paper addresses the options for evaluating various types of protective anti-corrosion systems which use progressive corrosion inhibitor technology in a laboratory environment. Corrosion inhibitors efficiently slow down the course of corrosive processes on steel reinforcement and prolong the service life of building constructions. The rate of efficiency can be verified with high information capability in the laboratory by a series of testing methods.

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Vigdorovich, V. I., L. E. Tsygankova, E. Yu Shel, N. V. Shel, L. G. Knyazeva, A. V. Dorokhov e A. A. Uryadnikov. "Modeling of corrosive atmospheres for evaluation of the efficiency of volatile inhibitors". Industrial laboratory. Diagnostics of materials 84, n. 7 (8 agosto 2018): 42–46. http://dx.doi.org/10.26896/1028-6861-2018-84-7-42-46.

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A method of modeling aggressive atmospheres used for different tests in corrosive environments close as possible to actual full-scale conditions is proposed. The method provides simulation of air atmospheres containing gaseous corrosion stimulants (CS) as microcomponents of air. The content of SCs in such atmospheres (both separately and together) can be set and maintained at an unchanged level within a wide range for as long as desired. The method is based on Henry’s equation characterizing concentration of the gas dissolved in a liquid phase as a function of the gas partial pressure in the equilibrium gas medium with allowance for the solubility of the corrosion stimulants in water in conditions under consideration. The procedure is easy to use and does not require long special training. Samples of corrosion stimulants NH3, CO2, and H2S are considered. Experimental results characterizing the corrosion rate of St3 carbon steel and copper with one or several CS simultaneously present in air atmosphere, as well as data on the efficiency of volatile inhibitors of «IFHAN» series under similar conditions are presented.

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Gaidar, Sergey M., Ruslan K. Nizamov, Mikhail I. Golubev e Ivan G. Golubev. "Protective Efficiency of Water-Soluble Corrosion Inhibitors". Mordovia University Bulletin 28, n. 3 (20 settembre 2018): 429–44. http://dx.doi.org/10.15507/0236-2910.028.201803.429-444.

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Introduction. As a result of damage to agricultural and forestry machines from corrosion, the costs of maintaining their performance are increasing. The use of water-soluble inhibitors can slow or halt the destructive process. However, many of the inhibitors have disadvantages, for example, flammability or toxicity. The purpose of this work is to study the protective effectiveness of aqueous solutions of boric acid ester and triethanolamine and to develop recommendations for their use for anticorrosive protection of agricultural and forestry machinery in long-term storage. Materials and Methods. Protective compositions were prepared by dissolving boric acid ester and triethanolamine in distilled and industrial water at room temperature. Aqueous solutions with a concentration of water-soluble inhibitors of 5–50 g/l (0.5–5 mass %) were used for research. The linear polarization resistance method was used to assess their protective efficiency. Solartron (UK) measuring complex was used for electrochemical studies. Accelerated corrosion tests were carried out on steel plates according to GOST 9.054-75 in the g-4 humidistat. The aftereffect of water-soluble corrosion inhibitors was evaluated by the residual film protective efficiency. Results. The influence of the concentration of the ester of boric acid and triethanolamine in aqueous solutions for their protective properties is studied. It was found that boric acid and triethanolamine slow the anode reaction. The analysis of the research results has showed that the corrosion rate of the steel electrode decreases with increasing the concentration of water-soluble inhibitor in process water. This decrease is the most noticeable when the concentration in the range of 10–50 g/l with an increase in the concentration in the solution of boric acid and triethanolamine to 50 g/l, their protective efficiency varies by 6–14 %. The optimal concentration of the inhibitor in the composition is obtained, which is 10 g/l during corrosion tests of steel plates, the protective efficiency of the solution with a concentration of 10 g/l of the water-soluble inhibitor was more than 70 %. In case of precipitation on the samples, the protective efficiency of the solutions decreased to 20–25 %. When tested in a closed unheated room on steel samples during the year there were no traces of corrosion. Conclusions. The study demonstrates that boric acid and triethanolamine is a watersoluble inhibitor of anodic corrosion. When the concentration of water-soluble inhibitor in process water increases, the corrosion rate of the steel electrode decreases. Optimum concentration of ester of boric acid and triethanolamine in the protective solution should be 10 g/l. For corrosion tests of steel plates, the shielding effectiveness of a solution of water- soluble inhibitor was more than 70 %. In the conditions of direct exposure to atmospheric precipitation on the samples of the protective efficiency of the solutions decreased to 20–25 %. When tested in a closed unheated room on steel samples there were no traces of corrosion during the year. Thus, the ester of boric acid and triethanolamine is effective to protect against atmospheric corrosion in a closed room. it Is recommended to apply it for protecting cars against corrosion at short-term storage on open platforms. The application field of water-soluble inhibitor when agricultural and forestry machines are retained for long-term storage is defined; combine stages of cleaning cars from pollution and preserving their surfaces for protection against corrosion are offered. The article will be useful to specialists in the field of protection of agricultural machinery from corrosion.

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Agboola, Oluranti, Toluwani Adedoyin, Ojo Sunday Isaac Fayomi, Ayoola Ayodeji, Samuel E. Sanni, Augustine Omoniyin Ayeni, Patricia Popoola et al. "DNA Inhibition of Hydrogen Ion-Induced Corrosion of Mild Steel Used for Pipelines in Oil and Gas Industries". Asian Journal of Chemistry 33, n. 4 (20 marzo 2021): 767–74. http://dx.doi.org/10.14233/ajchem.2021.22686.

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Corrosion of mild steel via chemical reaction in a corrosive environment is a problematic occurrence that is very common in oil and gas industries. Corrosion constitutes a huge part of the total costs in the production of oil and gas. Corrosion inhibitors have found interest in the scientific domain because they are mainly understood by their chemical complexes and formulations. Their utilization in small amount on metal surface used in oil and gas industries can help shield the metal from corrosion devoid of any significant alteration in the concentration of the corrosive media in the environment. An effort was made to study the possibility of using calf thymus gland DNA (CTGDNA) inhibitor in chlorine induced mild steel for possible usage in piping in oil and gas industry. The SEM micrograph shows that the adsorption of the CTGDNA biomacromolecules coat on the mild steel surfaces functions as a protection against HCl corrosive solution. Electrochemical study and weight loss analysis showed that the inhibitor efficiency (70.48 and 72%, respectively) of the tested DNA (CTGDNA) in HCl acidic corrosion environment for the mild steel was high at 1.5 M of HCl. The inhibitor efficiency decreased with increasing HCl concentrations. The open circuit potential (OPC) revealed that the mild steels got corroded until the end of the immersion. The intensities of XRD peak substantiate the existence of corrosion products of FeCl2.

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Mas’ud, Zainal Alim, Noviyan Darmawan, Januari Dawolo e Yusuf Bramastya Apriliyanto. "Fatty Amidine as Copper Corrosion Inhibitor". Journal of Chemistry 2020 (4 novembre 2020): 1–8. http://dx.doi.org/10.1155/2020/1092643.

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The development of green and sustainable corrosion inhibitors for copper in a corrosive marine environment is highly desired. Herein, we studied the fatty acid-based amidine as the new type of renewable corrosion inhibitor. Stearamidine salt was used as a model inhibitor, and it was synthesized through stearonitrile intermediate with an excellent isolated yield of 88%. We used electrochemical (potentiodynamic polarization) and morphological (scanning electron microscopy) measurements to assess the corrosion inhibition efficiency of stearamidine in 3.0 wt.% NaCl at 300 K. We show that, in such a condition, the optimum inhibition efficiency of 96% was achieved using only 0.2 mM stearamidine. The results suggested the fatty amidine is a promising corrosion inhibitor for copper that is suitable in the saltwater ecosystem. The thermodynamic parameters of the interaction between the stearamidine and the copper surface were determined, and the result suggests that the adsorption process occurred accordingly with the Langmuir adsorption isotherm and involved both physisorption and chemisorption.

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Più fonti

Tesi sul tema "Corrosion efficiency"

Luo, Jiaqi [Verfasser]. "Corrosion of copper in antibacterial efficiency test / Jiaqi Luo". Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2020. http://d-nb.info/1230797343/34.

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Elshami, Ahmed. "Efficiency of corrosion inhibitors used for concrete structures in aggressive environment". Nantes, 2012. http://www.theses.fr/2012NANT2035.

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La détérioration d'une structure en béton peut être dû à de nombreux processus, qui agissent individuellement ou en synergie. Quelques exemples de processus qui causent la détérioration des matériaux cimentaires comprennent des attaques sulfatique, des cycles gel-dégel, de la carbonation ou des attaques salins provoquant la corrosion des armatures dans le béton. La corrosion des armatures est l'un des phénomènes les plus importants qui réduit la durée de vie des ouvrages en béton, en impactant de façon importante le budget maintenance de la structure affectée. L’objectif de ce travail est d'étudier la durabilité à long terme de différents inhibiteurs de corrosion. D’une part, trois inhibiteurs de corrosion sont choisis comme représentatifs : le nitrite de calcium (CNI), l’éthanolamine (AMA) et le sodium monofluorophosphate (MFP). Ils sont incorporés dans trois bétons différents : le béton de ciment Portland (OPCC), le béton de ciment reconstitué avec 70% de ciment Portland et 30% de laitier (BCC) et le béton prêt à l’emploi (RMC). Afin d'étudier l'efficacité de ces trois inhibiteurs, quatre approches sont employées : une à l’échelle de la solution interstitielle de béton, une à l'échelle de la solution extraite de ciment, une à l'échelle du mortier et une à l'échelle du béton. L'étude est réalisée en employant des méthodes électrochimiques et analytiques afin de caractériser le mécanisme d'inhibition en présence d'ions chlore. D’autre part, l'objectif de cette étude est d'explorer l'efficacité d'un nouveau pigment inhibiteur de zinc-phosphate (ZP) obtenu par la conversion chimique et le traitement électrochimique cathodique. Cette étude est réalisée à l’échelle de la solution interstitielle de béton ainsi qu’à à l'échelle du mortier
The deterioration of a concrete structure may occur due to many processes, which act individually or synergistically. Some examples of processes that cause material deterioration include alkali aggregate reactivity, sulphate attacks, freezing, thawing, cycling, carbonation or salt attack inducing corrosion of concrete reinforcement. Corrosion of reinforcing rebars is one of the most important phenomenon’s that reduce the service life of a concrete structure, and causes a huge impact on the maintenance budget of affected structure. The objective of this research work is to study the long-term durability of different corrosion inhibitors. On the one hand, three additive corrosion inhibitors are selected as representatives : one is a calcium nitrite based corrosion inhibitor (CNI), the other corrosion inhibitors are ethanolamine (AMA) and sodium monoflurophosphate (MFP). They were admixed in water before casting of three different concretes (Ordinary Portland cement concrete (OPCC), blended cement concrete prepared with 30% slag in mass substitution of Portland cement (BCC) and ready-mix concrete (RMC)). In order to characterize the effectiveness of these inhibitors, four approaches are used: one at the level of pore concrete simulating solutions, one at the solution extract of cement level, one at the mortar level and one at the concrete level. The study was performed through the using electrochemical and analytical methods to discuss the inhibition mechanism in the presence of chloride ions. On the other hand, the objective of this study is to explore the efficiency of a new inhibitive pigment zinc-phosphate (ZP) used as coating for rebars and obtained by chemical conversion and cathodic electrochemical treatment, to protect carbon steel rebar against the corrosion by chloride ions in fresh pore concrete simulating solutions and mortars

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Rommetveit, Tarjei. "On the Efficiency of Data Communication for the Ultramonit Corrosion Monitoring System". Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10064.

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Ultramonit is a system under development for permanent installation on critical parts of the subsea oil- and gas pipelines in order to monitor the corrosion continuously by using ultrasound. The communication link which connects the Ultramonit units with the outside world is identified as the systems bottleneck, and it is thus of interest to compress the ultrasonic data before transmission. The main goal of this diploma work has been to implement and optimize a lossy compression scheme in C on the available hardware (HW) with respect to a self-defined fidelity measure. Limited resources, such as memory constraints and constraints with respect to the processing time, have been a major issue during implementation. The real-time aspect of the problem results in an intricate relation between transfer time, processing time and compression ratio for a given fidelity. The encoder is optimized with respect to two different bit allocation schemes, two different filters as well as various parameters. Compared to transferring the unprocessed traces, the results demonstrate that the transfer time can be reduced with a factor 12. This yields acceptable fidelity concerning the main application of long term monitoring of subsea pipelines. However, for ultra-high precision applications where the total change in thickness due to corrosion is less than a few micrometers, compression should not be employed.

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Wang, Hansheng. "Electrochemical investigation of "green" film-forming corrosion inhibitors :". Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-40888.

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In this work, a comparative electrochemical study has been performed to evaluate corrosion inhibition property of several film-forming corrosion inhibitors provide by Akzo Nobel on carbon steel in a chloride solution. For carbon steel exposed to 1 M NaCl solution with and without added inhibitor, electrochemical measurements including electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR) at different exposure time intervals, and potentiodynamic polarization at the termination of the exposure, have been performed to investigate the film forming process and to evaluate corrosion inhibition efficiency of the inhibitors, as well as its evolution with time. The corrosion resistance data obtained from the EIS and LPR measurements are in good agreement. The results indicate different inhibition properties of the inhibitors tested. The inhibition effect of SSF CI-1 is negligible in the first hour of exposure, but it increases steadily with time for 1 day, and then remains the same level during the exposure up to one week. SSF CI-2 exhibits a good inhibition effect in the first hour, but the effect decreases with time to a low level after 8 hours, and then increases again with prolonged exposure. SSF CI-4 shows a low inhibition effect during the first day, and then increases to a maximum level after three days’ exposure. For SSF CI-5 and SSF CI-6, the inhibition effect within 8 hours is relative low but higher than that of SSF CI-4, and the effect increases with time during prolonged exposure. The SSF CI-5 seems to be better than SSF CI-6 because of a more stable inhibition effect. The EIS results indicate that most of the inhibitors form a resistive surface film on carbon steel, which becomes more resistive and protective after several days’ of exposure. However, in the initial stage of exposure, the SSF CI-6 does not show an effect of formation of a resistive film on the surface. The potentiodynamic polarization measurements suggest that, SSF CI-1 and SSF CI-2 are anodic type inhibitor, SSF CI-4 is cathodic type inhibitor, and SSF CI-5 and SSF CI-6 are mix type inhibitor. Moreover, the inhibitors tested show a similar corrosion inhibition effect as mussel adhesive protein (MAP) at the low dosage level.

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GALLO, GERSON ORTIZ. "EVALUATION OF THE EFFICIENCY OF ALUMINA-COATED P92 STEEL TO HIGH TEMPERATURES CORROSION". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35988@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
A redução na emissão de CO2 na atmosfera é um dos desafios atuais mais importantes enfrentados por diferentes indústrias no mundo. A geração de energia através da queima de combustíveis fósseis utilizando oxigênio puro [1], também chamada de tecnologia de oxicombustão, é uma opção utilizada pelas indústrias de geração de energia para minimizar os índices de concentração de CO2 até emissão ZERO [1,2]. Inevitavelmente, as tubulações dos trocadores de calor que conformam aquelas plantas de energia, sofrem corrosão em contato com os gases de combustão (H2O-CO2) em altas temperaturas. Estas tubulações, fabricadas com aço ou com ligas ferro-cromo vem sendo utilizadas no intuito de reduzir a corrosão. Tubulações com revestimentos/recobrimentos protetores tem sido também considerados para aumentar a resistência a processos corrosivos sem requerer o emprego de ligas de alto custo. Um revestimento adequado deve ser inerte e estável em altas temperaturas como é o caso dos materiais cerâmicos. A alumina, sendo um material estável em ambientes característicos do processo de oxicombustão apresenta características favoráveis para esta proteção [3]. Amostras de Fe-Cr foram oxidadas sob condições que simularam processos de Oxicombustão nos laboratórios do Bundesanstalt Für Materialforschung Und-Prüfung (BAM) Berlim-Alemanha. O processo ocorreu a 650 graus Celsius durante 2000 h, em atmosfera contendo 60 por cento CO2,30 por cento H2O, 7 por cento N2, 2 por cento O2 e 1 por cento SO2. A caracterização microestrutural das amostras oxidadas foi realizada nos laboratórios do instituto Nacional de Tecnologia (INT), utilizando técnicas de Microscopia Eletrônica de Varredura (MEV) e Espectroscopia por Dispersão de Energia de Raios-X (EDS). Foram produzidos riscos na superfície do revestimento de Al2O3, previamente aos testes de oxidação, para simular falhas no revestimento; além da eficácia do revestimento de alumina, foi também avaliado o papel do cromo como meio protetor contra a corrosão e de outros elementos de liga no processo de oxidação do aço P92, buscando identificar o mecanismo de oxidação. Como resultado do fluxo dos gases de oxicombustão há formação de camadas de Fe3O4, Fe2O3 e cromo-espinélio nas ligas sem revestimento. As amostras que possuíam o revestimento de alumina apresentaram ótima proteção, com resultados de uma alta eficácia, enquanto as amostras que tinham riscos apresentaram uma oxidação interna de oxidação cromo-espinélio protetor na matriz logo abaixo da região afetada.
The reduction in the emission of CO2 in the atmosphere is one of the most important problems faced by different industries in the world. The generation of energy from oxyfuel oxygen, [1], also called Oxyfuel technology, is a matter of CO2 emission for ZERO [1,2]. Inevitably, as pipes of the heat exchangers that make up these power plants, they suffer corrosion in contact with the flue gases (H2O-CO2) at high temperatures. These pipes, made of steel or iron-chromium alloys, are not used instead of reducing corrosion. Pipes with protective coatings have already been submitted to increase resistance to corrosive processes without requiring the use of high cost alloys. One which must be inert and static at high temperatures is the case of ceramic materials. An alumina, being a suitable material to the environments characteristic of the Oxyfuel process, presents characteristics favorable to the protection [3]. Fe-9Cr samples were oxidized under conditions that simulated Oxyfuel processes in the laboratories of the Bundesanstalt Für Materialforschung Und-Prüfung (BAM) Berlin-Germany. The process occurred at 650 degree Celsius for 2000 h, in an atmosphere containing 60 percent CO2, 30 percent H2O, 7 percent N2, 2 percent O2 and 1 percent SO2. The microstructural characterization of the oxidized samples was performed in the laboratories of the National Institute of Technology (INT), using Scanning Electron Microscopy (SEM) and X-ray Energy Dispersion Spectroscopy (EDS) techniques. Risks were produced on the Al2O3 coating surface, prior to the oxidation tests, to simulate coating failures; besides the effectiveness of the alumina coating, the role of chromium as a protective medium against corrosion and other alloying elements in the oxidation process of P92 steel was also evaluated, in order to identify the oxidation mechanism. As a result of the flow of oxyfuel gases, Fe3O4, Fe2O3 and chromium-spinel layers are formed in the alloys without coating. The samples that had the alumina coating presented optimum protection, with results of a high efficiency, while the samples that had scratches presented an internal oxidation of protective chromium-spinel oxidation in the matrix just below the affected region.

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Zvandasara, Tendayi. "Influence of hydrodynamics on carbon steel erosion-corrosion and inhibitor efficiency in simulated oilfield brines". Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/2284/.

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Corrosion within the oil and gas sector is an ongoing concern for operators. The challenging nature of extraction and processing fluids is an unavoidable cause of severe metallic corrosion. With modern emphasis on health, safety and the environment, the case for managing corrosion has become an imperative agenda. Whilst new and more effective methods of mitigation are key, an interim solution is improving the value of current methods. A literature survey carried out within this project has revealed CO2 corrosion as contributing to most corrosion related failures within the industry. The corrosion behaviour in CO2 containing environments is complex partly due to the wide range of prevailing conditions such as temperature, CO2 concentration and flow conditions. For oil and gas transportation pipelines, internal corrosion mitigation can be achieved by the use of chemical inhibitors. Inhibitors have been established to be effective but are by no means a complete solution. Issues such as their effectiveness in high velocity and high shear flow are a main consideration for their function. The hydrodynamic nature of the flowing fluids can affect inhibitor efficiency by either slowing the rate of formation of the inhibitive layer or causing degradation of well-formed inhibitive layers. A combined effect may also be active. The corrosion behaviour of carbon steel in simulated oilfield conditions is investigated in this project with emphasis on conditions of varying velocity, impinging flow and consequently shear stress. Since inhibition is the main mitigation technique for fluid related corrosion, the efficiency of a commercially used inhibitor is, in this case assessed in the abovementioned conditions. To simulate both impingement and flow, a jet impingement apparatus is used in conjunction with a segmented-electrode specimen set up to separately study the erosion-corrosion behaviour of different hydrodynamic zones under the jet. Corrosion rates are measured by gravimetric analysis and results are also evaluated with electrochemistry. Additionally, galvanic interactions between the different hydrodynamic zones have been investigated. Visual and light-optical microscopic examinations are also used to assess variable effects within the zones. Under such conditions, the corrosion rates have been found to be significantly higher in impingement zones. Aerated conditions have shown a significant variation in corrosion behaviour between impingement and non-impingement zones. The results in CO2 saturated brines are consistent but with evidence of different relations between hydrodynamics and the corrosion rate. The inhibitor has been shown to be effective in CO2 saturated brines and significantly influenced by both inhibitor concentration and hydrodynamic conditions. Inhibitor efficiency has also shown a complex dependence on concentration and establishes a need to evaluate optimum inhibitor concentrations before field application. Evaluation of the mass loss results against electrochemistry has shown a large discrepancy between the two methods. This rather surprising result suggests solid-free flow is not entirely free of erosion and synergistic effects. This comprehensive study has not only improved current knowledge on the relation between hydrodynamics and inhibitor efficiency but also indicates a critical need to evaluate suitability of current monitoring methods. Electrochemical methods are increasingly used as a method of choice and while they contribute significant monitoring data, they are observed to be unable, alone, to monitor erosion and synergy. An industry review on their suitability to monitor solid-free flow corrosion is recommended.

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WANG, QIANG. "The Role of Zinc Particle Size and Loading in Cathodic Protection Efficiency". VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2908.

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Metallic additives, also known as anticorrosive pigments, can provide sacrificial cathodic protection and complement the barrier protection afforded by heterogeneous organic coatings to metallic substrates. The unique systematic study of the corrosion resistance of an epoxy coating reinforced with different sizes (80nm, 500nm, 10um) and continuous multiple pigment volume concentration (0, 2%, 10%, 20%, 45%) below global critical pigment volume concentration of zinc particles were studied. The thesis is developing the fundamental understanding to optimize corrosion protection and predicting the protection with time. The properties of these cathodic coatings were investigated by a single-frequency electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP) measurements that can be used as to understand cathodic protective state. Finite Element Analysis (FEA) has been applied here for modeling and simulating part of actual experiments. This thesis will help understanding the sensitivity and efficiency to various size and loading of metallic additives for corrosion protection.

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ASSIS, SERGIO L. de. "Estudo comparativo de ensaios acelerados para simulacao da corrosao atmosferica". reponame:Repositório Institucional do IPEN, 2000. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10872.

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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Al-Zubail, Saleh Abdullah. "An evaluation of efficiency of phenylenediamines as corrosion inhibitors for ASTM-A-179 steel in 1.0 N hydrochloric acid at room temperature". Ohio : Ohio University, 1986. http://www.ohiolink.edu/etd/view.cgi?ohiou1183039807.

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Al-Zubail, Saleh Abdullah. "An evaluation of efficiency of phenylenediamines as corrosion inhibitors for ASTM-A-179 steel in 1.0 N hydrochloric acid at room temperature". Ohio University / OhioLINK, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1183039807.

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Libri sul tema "Corrosion efficiency"

Elaghtaa, A. R. Effect of the presence of precorrosion on the efficiency of inhibitor in CO2 corrosion. Manchester: UMIST, 1995.

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Abdulrahman, A. Influence of pre-corrosion on the inhibitor efficiency of a quaternary amine in oxygen-free CO2 containing solution. Manchester: UMIST, 1996.

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Belokonev, Vladimir, Sergey Pushkin, Valeriy Nikol'skiy, Aleksandr Klimashevich, Mariya Ayrapetova e Nikolay Abashkin. Prevention and treatment of obstruction of the esophagus after chemical burns, corrosive liquids. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/991907.

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Textbook is dedicated to the prevention and treatment of obstruction of the esophagus after chemical burns by corrosive liquids. Presented possible options for the treatment of patients depending on the stage of the disease, prone to recurrence and complications. The main method of treatment of patients with obstruction of the esophagus is probing the efficiency of which depends on the techniques of its implementation. Considered indications for balloon dilatation and stenting of the esophagus. Great attention is paid to the prevention of complications of dilatation of the esophagus and treatment for their development. Meets the requirements of Federal state educational standards of higher education of the last generation. Designed for students of higher educational institutions, clinical interns, postgraduate students, doctors, surgeons and medical teachers.

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An Assessment of the IMEF Depot-Level Corrosion Prevention and Control Program and the Viability of Making it More Efficient and/or Outsourcing the Requirements through Private Sector Initiatives. Storming Media, 2002.

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Capitoli di libri sul tema "Corrosion efficiency"

Tiong, Ung Hing, e Graham Clark. "Aircraft Joints and Corrosion Control". In ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives, 625–34. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1664-3_50.

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Hayat, Muhammad Aamer, e 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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Kawahara, Yuuzou, Kouji Sasaki e Yuuji Nakagawa. "Development and Application of High Cr-High Si-Fe-Ni Alloys to High Efficiency Waste-To-Energy Boilers". In High-Temperature Oxidation and Corrosion 2005, 513–22. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-409-x.513.

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Tissier, Yolaine, Véronique Bouteiller, Elisabeth Marie-Victoire, Suzanne Joiret e Thierry Chaussadent. "Corrosion Processes of Carbonated Chloride-Contaminated Reinforced Concrete and Electrochemical Chloride Extraction (ECE) Efficiency". In RILEM Bookseries, 159–72. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-90236-4_12.

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Djellali, Souad, Hana Ferkous, Rachid Sahraoui e Sara Meharga. "Efficiency of Alkaloids Crude Extract of Cinnamomum Zeylanicum as Corrosion Inhibitor of Mild Steel in Sulfuric Acid Solution". In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (2nd Edition), 1379–84. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-51210-1_219.

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Huang, Ao, Gu Huazhi e Zou Yang. "Towards Efficient Modeling on Slag Corrosion of Lightweight Corundum Spinel Castable for Ladle". In Proceedings of the Unified International Technical Conference on Refractories (UNITECR 2013), 863–68. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118837009.ch147.

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Kozhukharov, Stephan, e Christian Girginov. "Recent Trends of the Use of Rare Earth Elements for Efficient Environmentally Compliant Corrosion Protection of Aluminum and Its Alloys". In NATO Science for Peace and Security Series B: Physics and Biophysics, 437–45. Dordrecht: Springer Netherlands, 2020. http://dx.doi.org/10.1007/978-94-024-2018-0_35.

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Singh, Ramesh. "Testing of High-Efficiency Coating Materials and Their Efficiency". In Corrosion Control for Offshore Structures, 149–62. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-12-404615-3.00010-3.

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Singh, Ramesh. "High-Efficiency Coating and Cathodic Protection". In Corrosion Control for Offshore Structures, 131–47. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-12-404615-3.00009-7.

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Adams, Feyisayo Victoria, Mbali Mokgatla, Abubakar Ishak, Chukwuma Valentine Onwujiuba, Pwafureino Reuel Moses e Utseoritselaju Okorodudu. "Corrosion Inhibitors: Effect on Aluminum Alloys". In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000197.

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Aluminum alloys are less corrosion resistance compared to the pure aluminum. The less corrosion resistance of the aluminum alloys results from trading their mechanical strength and stability with their corrosion resistance. Aluminum alloys show inhibition in alkaline, acidic, neutral chloride free, and chloride media. This study covers studies done on different inhibitors used in corrosion inhibition of aluminum alloys in various media. Generally, the inhibition efficiency of the inhibitors increases with increase in the concentration of the inhibitors. The inhibition efficiency also depends on the characteristic of the inhibitor; whether it is a mixed-type, anodic, or cathodic inhibitor. The experimental data fit in Langmuir adsorption isotherm indicates physical adsorption, while Gibb’s free energy values show that aluminum alloys’ corrosion inhibition is by spontaneous adsorption process. The addition of chloride in alkaline solution improves corrosion inhibition of aluminum alloys.

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Atti di convegni sul tema "Corrosion efficiency"

Reddy, V. Srinivasa, Thoodi Prashanth, V. Mallikarjuna Reddy e S. Shrihari. "Assessment of efficiency of corrosion inhibitors in mitigating corrosion of rebars in concrete". In SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0057893.

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Weghorn, S. J., e D. W. Stegmann. "Enhancing Chemical Efficiency Using Slow-Release Corrosion Inhibitors". In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 2005. http://dx.doi.org/10.2118/93169-ms.

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Wang, Yefei, Zhen Yang, Renzhuo Wang, Wuhua Chen, Mingchen Ding, Fengtao Zhan e Baofeng Hou. "High-efficiency Corrosion Inhibitor for Acidizing: Synthesis, Characterization and Anti-corrosion Performance of Novel Indolizine Derivative". In SPE International Conference on Oilfield Chemistry. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/193587-ms.

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Gamal, Hany, Salaheldin Elkatatny, Dhafer Al Shehri e Mohamed Bahgat. "Dissolution of Sulfates and Sulfides Field Scales by Developed Scale Dissolver". In SPE International Oilfield Corrosion Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205038-ms.

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Abstract Oil and gas industry deals with fluid streams with different ions and concentrations that might cause scale precipitation. The scale precipitation, will thereafter, affect the fluid flow characteristics. Many problems will be raised by the scale deposition that affects the overall petroleum production. This paper aims to develop a non-corrosive acid system with high dissolution efficiency for field complex scales that have sulfates and sulfides minerals. The paper provided a series of lab analysis that covers the compositional analysis for the collected scale sample, and evaluating the developed acid system for compatible and stable properties, dissolution efficiency, and the corrosive impact. A field scale sample that has a composite chemical composition of paraffin, asphaltene, sulfides and sulfates compounds with different weight percentages by employing the diffraction of X-ray technology. Developing the new scale dissolver was achieved by specific compositional study for the organic acids to achieve high dissolution efficiency and low corrosive impact for the field treatment operations. The study results showed the successful scale removal for the developed dissolver at low temperature of 95 and 113 °F for surface treatment jobs. The dissolution efficiency recorded 62 and 71 % for 17 hours at the temperature levels respectively. The fluid showed a stable and compatible performance and has a pH of 12. The corrosion test was conducted without any scale inhibitors and the results showed the low corrosion effect by 0.0028 lbm/ft2. The obtained successful results will help to dissolve such complex field scales, maintain the well equipment, and maintain the petroleum production from scale issues.

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Alshanati, M., e V. Mishurov. "THE ESTIMATION OF CATHODIC PROTECTION EFFICIENCY FOR CORROSION IN THE SOIL". In INNOVATIVE TECHNOLOGIES IN SCIENCE AND EDUCATION. DGTU-PRINT, 2018. http://dx.doi.org/10.23947/itno.2018.2.370-373.

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Jano, Albana, Efrosini Kokalari, Alketa Lame e Valbona Hoxha. "Comparison of Corrosion Protection Efficiency of Two Kinds of Amino Acids". In 7th World Congress on Mechanical, Chemical, and Material Engineering. Avestia Publishing, 2021. http://dx.doi.org/10.11159/iccpe21.109.

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Harvey, D., O. Lunder e R. Henriksen. "The Development of Corrosion Resistant Coatings by HVOF Spraying". In ITSC 2000, a cura di Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0991.

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Abstract Coatings have been prepared using the Diamond Jet hybrid and JP5000 high velocity oxyfuel (HVOF) systems with the objectives of improving corrosion resistance and reducing costs through increasing deposition efficiency. Models relating deposition efficiency, coating oxygen content and corrosion resistance to process parameters including fuel flow rate, oxygen flow rate and stand-off distance have been developed. A corrosion test cell has been designed and a procedure determined for studying the corrosion behaviour of large numbers of thermally sprayed coatings in an efficient manner. A significant improvement to the corrosion resistance of HVOF sprayed coatings has been achieved by spraying parameter optimisation and investigation of powder size and distribution. The project has also investigated the influence of spray angle on coating performance with a view to future onsite application. Coating materials tested and compared include nickel alloys Hastelloy C276 and 59, cobalt alloy Ultimet, duplex stainless steel S32750 and an experimental iron-based spray-fuse composition.

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Dumitrescu, Andrei, e Alin Diniţă. "Efficiency Assessment of the Composite Materials Repair Systems Intended for Corrosion Damaged Pipelines". In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96279.

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Abstract This paper presents the results of the research work carried out by the authors in order to evaluate the efficiency of the composite material wraps/sleeves (made of a polymeric matrix and reinforcing fabric) used to repair steel pipelines carrying hydrocarbons upon which local metal loss defects (generated by corrosion and/or erosion processes) have been detected. The pipeline repair technologies consisting of the application of composite material wraps are perceived as being advantageous alternative solutions for substituting the conventional technologies, which require welding operations to be performed in the pipe areas with defects. The efficiency of the composite repair systems has been investigated by assessing the reinforcement effects (the restoration level of the damaged pipe mechanical strength) generated by the applied composite wraps as a function of their geometry and mechanical properties. To that purpose, numerical models based on finite elements have been developed and certified by comparing them with the results of several experimental programs previously performed by the authors. Finite elements simulations have also been conducted in the plastic region, taking into account material non-linearity. The calculation methods proposed in literature (among which a method previously developed by the authors) to define the composite wrap dimensions (thickness and length) for a given pipe have also been investigated and compared to our numerical results in order to select the most adequate solution for the design of the composite repair system. The optimal values for the mechanical properties of the composite material used by the repair system have also been defined.

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Stoean, Ruxandra, Catalin Stoean e Adriana Samide. "Deep Learning for Metal Corrosion Control: Can Convolutional Neural Networks Measure Inhibitor Efficiency?" In 2018 20th International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (SYNASC). IEEE, 2018. http://dx.doi.org/10.1109/synasc.2018.00065.

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Lee, Shang-Hsiu, e Marco J. Castaldi. "High Temperature Corrosion Resistance of Different Commercial Alloys Under Various Corrosive Environments". In 15th Annual North American Waste-to-Energy Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/nawtec15-3220.

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High temperature corrosion is a major operating problem because it results in unscheduled shutdowns in Waste-to-Energy (WTE) plants and accounts for a significant fraction of the total operating cost of WTE plants. Due to the heterogeneous nature of municipal solid waste (MSW) fuel and the presence of aggressive elements such as sulfur and chlorine, WTE plants have higher corrosion rates than coal-fired power plants which operate at higher temperature. To reduce corrosion rates while maximizing the heat recovery efficiency has long been a critical task for WTE operators. Past researchers focused on high temperature corrosion mechanisms and have identified important factors which affect the corrosion rate [1–4]. Also, there have been many laboratory tests seeking to classify the effects of these corrosion factors. However, many tests were performed under isothermal conditions where temperatures of flue gas and metal surface were the same and did not incorporate the synergistic effect of the thermal gradient between environment (flue gas) and metal surface. This paper presents a corrosion resistance test using an apparatus that can maintain a well controlled thermal gradient between the environment and the surface of the metals tested for corrosion resistance. Two commercial substrates (steels SA213-T11 and NSSER-4) were tested under different corrosive environments. The post-test investigation consisted of mass loss measurement of tested coupons, observation of cross-sectional morphology by scanning electron microscopy (SEM), and elemental analysis of corrosion products by energy dispersive spectrometry (EDS). The stainless steel NSSER-4 showed good corrosion resistance within the metal temperature range of 500 °C to 630 °C. The alloy steel SA213-T11 had an acceptable corrosion resistance at metal temperatures up to 540 °C, and the performance decreased dramatically at higher temperatures.

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