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Journal articles on the topic 'Chromium plating'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 July 2024

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1

Pearson, T. "Chromium Plating,." Transactions of the IMF 87, no. 2 (March 2009): 63. http://dx.doi.org/10.1179/174591909x436507.

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2

MATSUSHITA, TETSUO. "Ultrahard chromium plating." Jitsumu Hyomen Gijutsu 34, no. 11 (1987): 459–62. http://dx.doi.org/10.4139/sfj1970.34.459.

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3

Snyder, Donald L. "Decorative chromium plating." Metal Finishing 98, no. 1 (January 2000): 215–22. http://dx.doi.org/10.1016/s0026-0576(00)80328-1.

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4

Newby, Kenneth R. "Functional chromium plating." Metal Finishing 98, no. 1 (January 2000): 223–33. http://dx.doi.org/10.1016/s0026-0576(00)80329-3.

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5

Snyder, Donald L. "Decorative chromium plating." Metal Finishing 97, no. 1 (January 1999): 215–22. http://dx.doi.org/10.1016/s0026-0576(00)83079-2.

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6

Newby, Kenneth R. "Functional chromium plating." Metal Finishing 97, no. 1 (January 1999): 223–47. http://dx.doi.org/10.1016/s0026-0576(00)83080-9.

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7

Snyder, Donald L. "Decorative chromium plating." Metal Finishing 105, no. 10 (2007): 173–81. http://dx.doi.org/10.1016/s0026-0576(07)80332-1.

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8

Newby, Kenneth R. "Functional chromium plating." Metal Finishing 105, no. 10 (2007): 182–91. http://dx.doi.org/10.1016/s0026-0576(07)80333-3.

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9

Snyder, Donald L. "Decorative chromium plating." Metal Finishing 99 (January 2001): 215–22. http://dx.doi.org/10.1016/s0026-0576(01)85279-x.

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10

Newby, Kenneth R. "Functional chromium plating." Metal Finishing 99 (January 2001): 223–33. http://dx.doi.org/10.1016/s0026-0576(01)85280-6.

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11

Newby, Kenneth R. "Functional chromium plating." Metal Finishing 100 (January 2002): 212–21. http://dx.doi.org/10.1016/s0026-0576(02)82022-0.

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12

Snyder, Donald L. "Decorative chromium plating." Metal Finishing 97, no. 1 (January 1999): 219–26. http://dx.doi.org/10.1016/s0026-0576(99)80021-x.

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13

Newby, Kenneth R. "Functional chromium plating." Metal Finishing 97, no. 1 (January 1999): 227–38. http://dx.doi.org/10.1016/s0026-0576(99)80022-1.

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14

Snyder, Donald L. "Decorative chromium plating." Metal Finishing 93, no. 1 (January 1995): 205–12. http://dx.doi.org/10.1016/0026-0576(95)93367-b.

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15

Newby, Kenneth R. "Functional chromium plating." Metal Finishing 93, no. 1 (January 1995): 213–22. http://dx.doi.org/10.1016/0026-0576(95)93368-c.

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16

Suárez García, Óscar Javier. "Obtaining decorative chromium plating from trivalent chromium solutions." Ingeniería e Investigación 26, no. 2 (May 1, 2006): 75–83. http://dx.doi.org/10.15446/ing.investig.v26n2.14739.

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The present work was aimed at a qualitative evaluation, in the laboratory, of different alternatives for assembling and operating a trivalent chromium bath for decorative chromium plating. Different chromium concentration solutions and different complexing agents were used. The initial result of this analysis was that chloride, formate and acetate solutions produced the best results. Solution preparation conditions were evaluated: temperature, chromium III complex formation time and also operation during the plating process: pH and temperature. The experimental work was done in the Alfacrom Ltda company; the parameters evaluated consisted of the appearance of chromium deposit and the minimum current density at which it appeared. Resistance to corrosion was tested in a saline-spray chamber, taking conventional hexavalent chromium plating as reference. This assay was done in the Universidad Nacional de Colombia’s Chemical Engineering Laboratory. It was concluded that trivalent chromium plating may represent a technical and economic alternative to conventional hexavalent chromium plating, this being a highly toxic and contaminant process. However, research should be continued into finding optimal process conditions.
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17

Islam, Md Saiful, Md Jahid Hasan, Promita Poroma, and Sraboni Akter. "A review on the environment friendly electroplating of Cr (III) & Cr (VI)." Journal of Science and Engineering Papers 01, no. 01 (January 18, 2024): 31–39. http://dx.doi.org/10.62275/josep.24.1000006.

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Chromium plating process is the most effective way of protecting the base material against hostile environment or improving surface properties of base material. There are several problems with traditional chrome plating. Traditional process uses toxic acid baths and may cause various health conditions. The baths employed contain chromic acid in which the chromium is in the hexavalent state. Hexavalent chromium has been proved to have toxic, mutagenic and cancerogenic effects for human health. As a result, In Europe, the implementation of the reach initiative will increase fees on companies still using Cr (VI) in 2017 and will require action plans to phase out Cr (VI) in the future. This has left the plating industry in a very delicate position with dark future prospects unless new solutions that are both effective and environmentally friendly are discovered. Superchrome Physical Vapor Deposition coating ahead of looming industry regulatory actions that will drive towards the removal of hazardous hexavalent chromium compounds. These new sputtered chromium coatings do not require a protective paint top coat to pass exterior automotive trim specifications. Visually the chromium coatings match those of electroplated decorative chromium in color and appearance.
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18

Li, Bao Song, and An Lin. "Study of Hard Chromium Plating from Trivalent Chromium Electrolyte." Key Engineering Materials 373-374 (March 2008): 200–203. http://dx.doi.org/10.4028/www.scientific.net/kem.373-374.200.

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Hard chromium deposits were prepared from a trivalent chromium plating bath as an alternative to conventional hexavalent chromium deposits. The influences of bath composition on the trivalent chromium electrodeposition process and deposited coating properties were studied. The effects of plating parameters such as current density, bath pH and plating time on structure and morphology of deposited coatings were investigated. Results show that the hard chromium deposits exhibited amorphous structure with thickness of 50-100μm and acceptable quality for functional coatings. The hard chromium deposits exhibited better wear resistance as well as corrosion resistance than that of hexavalent chromium deposits. The hardness of as-deposited chromium coatings is about 600-700HV. Heat treatment could improve the wear resistance and hardness of the hard chromium deposits. The formation of polynuclear coordination compounds from hydroxyl complex ions at high pH is the main disadvantageous factor for the sustained trivalent chromium plating process.
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19

Fomichev, V. T., A. V. Savchenko, and G. P. Gubarevich. "Specific Morphological Features of the Surface of Chromium Coatings Obtained in Electrolytes with Organic Additives." Materials Science Forum 1083 (April 6, 2023): 147–52. http://dx.doi.org/10.4028/p-kn0n0v.

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At the present time, the electrodeposition of chromium metal coatings of sufficient thickness and quality is possible only from chromium plating electrolytes containing chromic acid. The authors investigated the effect of the composition of chromium plating electrolyte on the quality of the resulting metal coating. It has been demonstrated that the introduction of organic additives, of gallic acid in particular, leads to significant changes in the surface of the metal deposit and to a decrease in its hardness. Assumptions have been made about the influence of organic additives on the metal deposition process. The experimental data on the content of gases in the chromium deposits obtained from electrolytes with gallic acid additive and without it have been presented.
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20

Ismayilov Vugar, Ismayilov Vugar. "ANALYSIS OF METHODS FOR INCREASING THE SURVIVABILITY OF SMALL ARMS AND CANNON BARRELS BY THE APPLICATION OF CHROME COATINGS." ETM - Equipment, Technologies, Materials 14, no. 02 (April 18, 2023): 172–79. http://dx.doi.org/10.36962/etm14022023-172.

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This paper is an analysis of modern chrome coating technologies for the barrels of small arms and cannons. Barrel survivability refers to the ability of a weapon system to fire a certain number of rounds without significant deterioration in ballistic characteristics. There are various methods to provide the necessary survivability of the barrels, both technological and constructive. This paper will consider technological methods, in particular chroming technologies. The objects of the research are various methods of chromium coating: electrolytic, cylindrical magnetron sputtering, galvanic honing, cathode-mechanical chromium plating, and thermodiffusion saturation by chromium. Electrolytic chrome plating in baths is the most common method, however it has significant drawbacks - toxic waste, difficulty in providing uniformity and integrity of plating, hydrogen release during plating, the need for subsequent heat treatment of the barrel. Coating barrels with cylindrical magnetron sputtering is one of the least studied methods, but from the available materials we can note the reduced toxicity and the absence of hydrogenation of the barrel and the plating. Nevertheless, the adhesion of the coating material and the barrel should be investigated. Analysis of the thermodiffusion chrome saturation method is also a promising method. However, a reduction in temperature during the coating process and subsequent normalization of the coating is necessary. This method is currently being investigated in the "Special purpose product technology" laboratory at the Azerbaijan Technical University. As a result of the research, the most prospective methods can be considered galvanic honing, the cathodic-mechanical method and thermodiffusion chrome saturation. The advantages of these methods are increased productivity and quality of the plating surface. In addition to the prospective chrome plating methods, the paper also noted questions for which the answers remain open. Keywords: barrel, coating, chromium plating, wear, electroplating, magnetron sputtering, diffusion.
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21

Ardashev, D. V., L. V. Shipulin, and A. S. Degtyareva-Kashutina. "Aspects of Applying Hard Chromium Coatings on the Inner Surfaces of Components for Hydraulic Drives with Hydrostatic Guideways." Solid State Phenomena 316 (April 2021): 827–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.827.

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We considered the processes of chromium plating the inner surfaces of the components of cylinders with hydrostatic guideways. We demonstrated the various aspects of the chromium plating process – the limitations placed on the machinery depending on the dimensions of the parts to be plated and the unevenness of the deposition rate of chromium along the length of the part. We developed a diagram of an installation for the application of a hard chromium coating on inner surfaces, which includes a cathode, an anode, a tank, and a pipeline. The distinctive features of the installation are the method of supplying the electrolyte at an angle to the horizontal, which allows us to supply the electrolyte through a turbulent flow swirling along a helical path, and the use of a chromium-plated installation casing. We studied various modes for applying a hard chromium coating on the inner surfaces of a hydraulic cylinder. As a result, we determined the optimal composition of the chromium electrolyte – the ratio of chromic anhydride and sulfuric acid – which is 10:1, respectively, and experimentally selected deposition modes. Chromium coatings obtained through the use of the concentrated electrolyte, which we developed, and the chromium plating method have 5...20% greater hardness and a 10...30-times reduction in porosity with the formation of a shiny, lumpy sludge, which corresponds to corrosion-resistant and wear-resistant coatings needed to manufacture hydraulic drives with highly efficient hydrostatic guideways.
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22

KOBAYASHI, Yuichi. "Crack Free Chromium Plating." Journal of the Surface Finishing Society of Japan 65, no. 4 (2014): 162–66. http://dx.doi.org/10.4139/sfj.65.162.

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23

MORTON, P. H. "Nickel and Chromium Plating." Surface Engineering 3, no. 1 (January 1987): 18. http://dx.doi.org/10.1179/sur.1987.3.1.18.

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24

Gardner, Alan. "Decorative trivalent chromium plating." Metal Finishing 104, no. 11 (November 2006): 41–45. http://dx.doi.org/10.1016/s0026-0576(06)80342-9.

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25

Schario, Mark. "Decorative trivalent chromium plating." Metal Finishing 106, no. 6 (June 2008): 66–68. http://dx.doi.org/10.1016/s0026-0576(08)80167-5.

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26

Snyder, Donald L. "Decorative Chromium Plating Basics." Metal Finishing 110, no. 2 (March 2012): 14–21. http://dx.doi.org/10.1016/s0026-0576(13)70110-7.

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27

Blum, Dr William. "CHROMIUM PLATING IS EXPANDING." Journal of the American Society for Naval Engineers 39, no. 1 (March 18, 2009): 120–25. http://dx.doi.org/10.1111/j.1559-3584.1927.tb04983.x.

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28

Mooney, Ted. "Chromium plating on aluminum." Metal Finishing 95, no. 1 (January 1997): 65. http://dx.doi.org/10.1016/s0026-0576(97)81985-x.

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29

Kotomchin, A. N. "Оptimization of the chrome plating bath operation during the restoration of vehicle parts." Russian Automobile and Highway Industry Journal 18, no. 4 (September 17, 2021): 390–405. http://dx.doi.org/10.26518/2071-7296-2021-18-4-390-405.

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Introduction. In the process of chrome plating of car parts, there is a change in the composition of the chrome plating bath, which affects the stability of the ongoing processes – the performance and quality of the chrome coating. Therefore, it is necessary to constantly monitor the chrome plating bath for the presence of foreign elements that can be formed during the operation of the bath during the reaction of the solution with the anode or cathode.Materials and methods. During the research, the necessary equipment was used, which made it possible to determine with sufficient accuracy the content of trivalent chromium and its effect on the electrolysis process – the performance and quality of chrome coatings. A well-known technique was used to determine the quality and performance.Results. When conducting studies of the obtained cold self-regulating chromium plating electrolyte, it was found that trivalent chromium has a significant effect on the stability of the chromium plating bath. The content of which can vary within 2...25 g/l during operation. As a result, it was found that the optimal amount of trivalent chromium is its content in the chromium plating bath from 2 to 15 g/l. With a lower or higher content, the electrolysis performance and the quality of the chrome coating decrease. It was also found that in order to maintain the optimal amount of trivalent chromium and increase the time for stable operation of the chromium bath, it is necessary to observe the ratio of the area of the anode and cathode (the coated surface of the part), the value of which is within 3...4.Discussion and conclusion. As a result of the conducted research, it will make it possible, under certain conditions, to carry out the process of chromium deposition from a cold self-regulating electrolyte, which will allow for stable chromium deposition at high productivity and the necessary quality of the coatings obtained. The main condition is to control and maintain the amount of trivalent chromium in the chromium plating electrolyte in the bath.
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30

Gruba, O., and N. Vekesser. "Increasing the Efficiency of the Electrolytic Chromiation Process." Bulletin of the South Ural State University series "Chemistry" 14, no. 1 (2022): 114–24. http://dx.doi.org/10.14529/chem220113.

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The problem of increasing reliability and durability of machines, mechanisms, and instruments is common to all fields of technology. This problem can be solved by applying wear-resistant coatings and chromium-based alloys. The method of electrochemical chromium plating has a number of significant disadvantages: low current efficiency of chromium; the lowest dissipation ability among galvanic processes; high energy intensity; the presence of high internal stresses of chromium coatings; hydrogenation of chromium and base alloy sediments. Therefore, at present, a large number of studies are being carried out aimed at intensifying chromium plating processes. The present paper is aimed at studying the possibilities of optimizing the chromium plating process by changing the composition of an electrolyte. The currently used chromium plating electrolytes are classified according to the following parameters: electrolyte composition, process conditions, cathode current efficiency, and quality of the obtained coatings. On the basis of experimental studies carried out by the authors, the possibility of intensifying the process of electrolytic chromium plating from aqueous solutions by changing the composition of the electrolyte has been shown. The influence of a number of anions (SO_4^(2–), SiF_6^(2–), Cl^–, F^–,NH_2 SO_3^–, PO_4^(3–), IO_3^–, I_2 O_7^(4–)) on the quality of precipitation and the current efficiency has been studied. Methods for improving the most popular universal electrolytes have been proposed.
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31

SHIMPO, Ryokichi. "Hard Chromium Plating Using Trivalent Chromium Baths." Journal of The Surface Finishing Society of Japan 69, no. 6 (June 1, 2018): 219–25. http://dx.doi.org/10.4139/sfj.69.219.

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32

Wang, Fang, Song Xue, and En Jiang. "Study on Change of Chromium Plating Thickness of Threads of Control Rod Drive Mechanism of Nuclear Power." Materials Science Forum 956 (June 2019): 125–34. http://dx.doi.org/10.4028/www.scientific.net/msf.956.125.

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Control rod drive mechanism is one of the key main components in nuclear power plants and serves in harsh environments such as high temperature, high pressure and nuclear radiation. In order to ensure the service life and to prevent biting when assembling, some of the threads of control rod drive mechanism need to be chromium plated. In view of the high demands of the same chromium plating thickness on all surfaces of the threads of control rod drive mechanism of nuclear power and non-uniformity in chromium plating thickness of threads due to poor throwing power of chromium plating solution, five representative kinds of threads of control rod drive mechanism were selected and the plating thickness change of the root diameter, pitch diameter and crest diameter of threads was studied in this paper by means of depositing different thickness chromium coating on the surface of threads. The experimental results show that thicker coating is deposited on the crest of thread because of high current density and thinner coating is deposited on the root of thread because of low current density, which can provide reference for specification of chromium plating thickness of thread products of control rod drive mechanism.
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33

Nguyen, Vinh Phoi, Thien Ngon Dang, and Chi Cuong Le. "Effect of Residual Stress and Microcracks in Chrome Plating Layer to Fatigue Strength of Axle-Shaped Machine Parts." Applied Mechanics and Materials 889 (March 2019): 10–16. http://dx.doi.org/10.4028/www.scientific.net/amm.889.10.

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Chromium plating is used widely in industry to enhance wear, abrasion resistance and to restore the dimensions of undersized parts. However, tensile residual stress always exists in chrome layer because of hydrogen embrittlement so it affect to mechanical properties of the chromium plating machine element, especially in fatigue strength. In this paper, effect of residual stress in chrome plating layer to fatigue strength was studied. The sample (AISI 1045 steel) was plated with 10 and 60 micrometers thicknesses and residual stress in chrome plating layer was determined by X-ray diffraction technique (Cu-Kα radiation). The results showed that chromium layer thicknesses go up, tensile residual stress decrease and microcrack density increase. Consequently, fatigue strength goes down when chromium layer thicknesses increase.
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34

Gruba, Oksana N., Dmitrii V. Ardashev, and Victor P. Chernobrovin. "Main Directions of the Electrochemical Chrome Plating Process Intensification." Solid State Phenomena 299 (January 2020): 798–804. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.798.

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One of the main problems common to all areas of technology is to increase the reliability and durability of machines, devices, and mechanisms. This problem can be solved by applying wear-resistant coatings and chromium-based alloys. The method of electrochemical chrome plating has a number of significant drawbacks: low current efficiency of chromium; the lowest dispersing capacity among galvanic processes; high energy intensity; the presence of high internal stress chrome plating; hydrogenation of chromium sediments and base alloy. Therefore, at present, a large number of works are being carried out aimed at intensifying the processes of chromium plating. This work is aimed at exploring the possibilities of optimizing the process of chrome plating by changing the composition of the electrolyte. Classification of currently used electrolytes of chromium plating was carried out according to the following parameters: electrolyte composition, process conditions, cathode output by current and quality of the coatings obtained. On the basis of experimental studies conducted by the authors, the possibility of intensifying the process of electrolytic chromium plating from aqueous solutions, due to a change in the composition of the electrolyte, is shown. The effect of a number of anions (SO2-4, SiF2-6,Cl-,F-, NH2SO-3, PO3-4, IO3-3, I2O4-7) on the quality of sediments and current efficiency is studied. The ways to improve the most popular universal electrolytes are proposed.
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35

Munish Baboria and Atul Singh Pathania. "An analytical investigation pertaining to autocatalytic plating of chromium nickel carbide powder on copper alloys using electroless deposition method." World Journal of Advanced Research and Reviews 17, no. 1 (January 30, 2023): 291–301. http://dx.doi.org/10.30574/wjarr.2023.17.1.0002.

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Engineered components can gain desirable properties when coated with surface materials. Hard chromium has been given priority in material selection list while making choice for certain wear and corrosion- resistant coatings because of its desirable combination of chemical resistance, adhesion, and mechanical properties. Owing to the existing environmental safety concerns, there is restrictions on the employability of hexavalent chromium ions as plating material. This substantiates a need to develop an environmentally friendly process for alternative coatings. Today, Chromium Nickel Carbide (Cr-Ni-C) is emerging as good quality plating substrate with no the toxic compounds as compared to existing chromium complex. The purpose of this research paper is to investigate electroless processes for plating metal powder, chromium nickel carbide with nickel. These particles were successfully encapsulated with Ni by electroless deposition method using different solutions.
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36

Nikolova, S., T. Dobrev, and M. Monev. "Determination of trivalent chromium in chromium plating electrolytes." Metal Finishing 93, no. 5 (May 1995): 12–18. http://dx.doi.org/10.1016/0026-0576(95)90683-9.

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37

Izumi, Marcel Tadashi, Marcio Ferreira Hupalo, Nathalie Carine Christoforo Ribeiro, Joziel de Jesus Correa, José Deodoro Trani Capochi, and Osvaldo Mitsuyuki Cintho. "Study of the Utilization of Chromium Plating Waste by Mechanical Activation." Materials Science Forum 727-728 (August 2012): 392–97. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.392.

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In this study, the production of metallic chromium via metallothermic process was investigated. A chromium oxide-rich residue from chromium plating industry was characterized. Aluminothermic reduction was performed in lab-scale using an open graphite crucible. The plating residue and the aluminum powder were processed in a SPEX mill, in order to promote its effective mixing and mechanical activation. Energy dispersive X-Ray (EDX) analyses in the scanning electron microscope (SEM) have shown the presence of metallic chromium in the reaction products.
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38

KOSHIMIZU, Isao. "HEEF hard chromium plating process." Jitsumu Hyomen Gijutsu 33, no. 7 (1986): 248–53. http://dx.doi.org/10.4139/sfj1970.33.248.

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39

Mooney, Ted. "Copper underplates in chromium plating." Metal Finishing 95, no. 4 (April 1997): 62. http://dx.doi.org/10.1016/s0026-0576(97)90063-5.

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40

Mooney, Ted. "Chromium plating of auto springs." Metal Finishing 95, no. 1 (January 1997): 66. http://dx.doi.org/10.1016/s0026-0576(97)94625-0.

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41

Humphries, C. H. "PLATING WITH CHROMIUM FOR WEAR." Journal of the American Society for Naval Engineers 38, no. 4 (March 18, 2009): 964–67. http://dx.doi.org/10.1111/j.1559-3584.1926.tb02002.x.

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42

WATANABE, Kazuo. "Influence of Basic Component of plating Bath. Chromium Plating." Journal of the Surface Finishing Society of Japan 50, no. 2 (1999): 149–54. http://dx.doi.org/10.4139/sfj.50.149.

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43

Kokieva, Galia, and Varvara Dryzianova. "Pump elements recondition by electrolytic chromium plating." E3S Web of Conferences 273 (2021): 07003. http://dx.doi.org/10.1051/e3sconf/202127307003.

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Improving the efficiency of maintenance production in agriculture closely connected to the creation and implementation of such methods of repair and recondition of elements that improve the physicomechanical and service properties of wear joint assemblies.The presence of a nitrided case on the surface of elements lays the groundwork for obtaining a complex covering based on chromium nitrides. Electrolytic chromium plating is one of the ways to recondition elements that increase the service life and machines reliability, and reduce maintenance cost. However, the widespread adoption of chromium plating for the recondition of worn elements is hold back by the low productivity of the process. Therefore, the intensification of chromium plating in reconditioning worn-out machine elements is an urgent problem. It is advisable to recondition critical parts subjecting to abrasive wear, for example, precision vapors of fuel injection equipment, with chromium plating. However, the low productivity and high-energy consumption of the process require the improvement of the electrolyte in order to increase the current output of chromium and the permissible cathode density. The article describes a method for improving the quality of an electrolyte, a method for increasing its versatility, namely the supplementation of various organic additives and complexing substances into it.
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44

Bogdanov, Sergey P., Nikolay A. Khristiuk, A. V. Anisimov, and Maxim М. Sychov. "Increase of Stainless Steel Wear Resistance by Diffusion Chromium Plating Using Iodine Transport." Materials Science Forum 1040 (July 27, 2021): 139–52. http://dx.doi.org/10.4028/www.scientific.net/msf.1040.139.

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The article presents the results of a study of diffusion chromium plating of stainless steel X20Cr13 by iodine transport. The main kinetic laws of the process - the effect of temperature and time of chromium plating on the thickness of the coatings - have been studied. It is shown that the main phases of the coating are chromium carbides and nitrides with surface microhardness HV up to 15 GPa. The tribotechnical properties of the obtained coatings on rollers - friction pairs are determined.
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45

MORIKAWA, Tsutomu, and Masayuki YOKOI. "Induced Codeposition of Chromium Nitride from Chromium Plating Baths." Journal of the Surface Finishing Society of Japan 45, no. 11 (1994): 1141–45. http://dx.doi.org/10.4139/sfj.45.1141.

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46

Shaburova, N. A. "Thermal diffusion chroming of complex shape steel parts using a thermoemission field." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 79, no. 4 (May 20, 2023): 325–33. http://dx.doi.org/10.32339/0135-5910-2023-4-325-333.

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Chemical-thermal treatment (CHT) technologies have been known and used since the 50s of the last century. CHT methods traditionally include carburizing, nitriding, diffusion metallization with zinc, chromium and other elements. CHT affects the chemical composition of the part surface, providing it with the required level of strength properties and corrosion resistance. The results of the authors' research show that the CHT technology and thermal diffusion chromium plating, in particular, can be significantly improved by activating the work of the internal thermionic field created by additives-emitters of electrons and oxygen anions in the saturating powder mixture. The correct choice of emitter additives allows not only to accelerate the diffusion of chromium, but also ensures such a technological prop-erty of the filling as good knockout of parts. The paper presents the results of thermal diffusion chromium plating of bushings with an inner diameter of 20 mm made of steel 40CrNiMo2 in saturating mixtures with serpentine and serpen-tine and coarse-grained ferro-tungsten powder as emitter additives. The efficiency of using such saturating mixtures is confirmed by the increased diffusion layer of chromium in the metal compared to chromium plating in traditional satu-rating mixtures by 60 and 130%, respectively, for a mixture with the addition of serpentine and a mixture with serpen-tine and ferrotungsten. The expediency of using mixtures of such compositions for chromium plating of complex-shaped parts is shown, and the use of coarse-grained ferrotungsten powder ensures its multiple use. The results of X-ray phase analysis of chromium-plated surfaces and measurements of their hardness are also presented
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47

Yang, Zhongyi, Ning Zhang, Hongtao Li, Bo Chen, and Bo Yang. "Comparison to Micro Wear Mechanism of PVD Chromium Coatings and Electroplated Hard Chromium." Materials 16, no. 7 (March 28, 2023): 2695. http://dx.doi.org/10.3390/ma16072695.

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Electroplated hard chromium (EPHC) has been widely used in industry due to its excellent mechanical properties, but the development of this technology is limited by environmental risks. The physical vapor deposition (PVD) process has shown promise as an alternative to EPHC for producing chromium-based coatings. In this research, we investigate the microstructure and wear resistance of pure chromium coatings using two PVD techniques, namely, magnetron sputtering ion plating (MSIP) and micro-arc ion plating (MAIP), which are compared to EPHC. To assess wear resistance, we evaluated factors such as hardness, coating base bonding force, wear rate and friction coefficient via friction and wear experiments. The results show that, in terms of microstructure, while the EPHC coating does not exhibit a strong preferred growth orientation, the PVD coatings exhibit an obvious preferred growth orientation along the (110) direction. The average grain size of the EPHC coating is the smallest, and the PVD chromium coatings show a higher hardness than the EPHC coating. The results of pin-on-disk tests show that there is little difference in friction coefficients between EPHC and MAIP chromium plating; however, the MAIP chromium coating showed an excellent specific wear rate (as low as 1.477 × 10−13 m3/Nm). The wear condition of the MAIP chromium coating is more stable than that of the EPHC coating, indicating its potential as a replacement for EPHC.
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48

Salakhova, R. K., V. V. Semenychev, and A. B. Tihoobrazov. "Specific electrical conductivity of chromium plating and nickel plating electrolytes." VESTNIK of the Samara State Aerospace University, no. 3(45) (December 30, 2014): 70. http://dx.doi.org/10.18287/1998-6629-2014-0-3(45)-70-78.

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49

Wang, Juan, Si Yu Lai, and Jin Zhou. "Finite Element Analysis of Chromium Layer for Cold Roller Based on Material Properties and Mechanics Properties." Advanced Materials Research 700 (May 2013): 160–63. http://dx.doi.org/10.4028/www.scientific.net/amr.700.160.

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The chromium-plating method is proposed to solve the wear and spalling problem of the cold roller in the rolling process. A three-dimensional asymmetric rolling model is constructed by using elastic-plastic finite tool, and the stress on the roller in different plating hardness, thickness and layers in cold rolling process is analyzed. By comparing the simulated results, the optimized state for chromium layer is scheduled.
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50

Shishurin, Sergey Aleksandrovich. "Results of stand and operational tests of high pressure fuel pump with plunger pairs recovered by nanocomposition chromination." Agrarian Scientific Journal, no. 8 (August 25, 2019): 95–99. http://dx.doi.org/10.28983/asj.y2019i8pp95-99.

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The article presents the technology of restoration and hardening of plunger pairs of fuel injection pumps by nanocomposite electrolytic chrome plating, as well as the results of bench and performance tests of fuel injection pumps for the YaMZ-238ND3 diesel engine. According to the test results, the reduction of the starting cyclic fuel supply for a pump with plunger pairs, restored and strengthened by nanocomposite electrolytic chromium plating is 1.1–1.38 times less than that of a pump with plunger pairs recovered and hardened by base chromium plating and 1.4–1.8 times less than the TNVD with serial plunger pairs.
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