Aspects of Applying Hard Chromium Coatings on the Inner Surfaces of Components for Hydraulic Drives with Hydrostatic Guideways

Abstract:

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.

• Periodical: Solid State Phenomena (Volume 316)
• Pages: 827-832
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.316.827
• Online since: April 2021
• Authors: Dmitry V. Ardashev*, Leonid V. Shipulin, A.S. Degtyareva-Kashutina
• Keywords: Chromium Plating, Hydraulic Drives, Hydrostatic Guideways, Inner Surfaces

References

[1] M.A. Shluger, Galvanic coatings in mechanical engineering: Vol. 1, Mechanical Engineering, Moscow, (1985).

[2] L.Ya. Bogorad, Chromium plating, Mechanical Engineering, Leningrad, (1984).

[3] F.F. Azhogin, M.A. Belenky, I.E. Gal et al., Electroplating, Metallurgy, Moscow, (1987).

[4] V.I. Liner, Protective coating of metals, Metallurgy, Moscow, (1974).

[5] R. Weiner, Galvanic Chromination, Mechanical Engineering, Moscow, (1964).

[6] L.N. Solodkova, V.N. Kudryavtsev, Electrolytic chromium plating, Globe, Moscow, (2007).

[7] M.A. Shluger, Galvanic coatings in mechanical engineering: Vol. 2, Mechanical Engineering, Moscow, (1985).

[8] A.M. Sukhotin, Handbook of Electrochemistry, Chemistry, Leningrad, (1981).

[9] A.M. Yashpolsky, V.A. Ilyin, A brief reference book of galvanic engineering, Mechanical Engineering, Leningrad, (1981).

[10] G.A. Pokrovskaya, Theory and practice of chromium plating, KRDENTP, Kiev, (1974).

[11] M.B. Cherkez, L.Ya. Bogorad, Chromium plating, Mechanical Engineering, Leningrad, (1978).

[12] O.N. Gruba, I.V. Shmidt, A.E. Gorodkova, Influence of the Parameters of Galvanomechanical Chromium Plating on the Coating Quality and Process Productivity, Solid State Phenomena. 284 (2018) 1173-1177.

DOI: 10.4028/www.scientific.net/ssp.284.1173

[13] D.A. Zherebtcov, O.N. Gruba, K.R. Smolyakova, Effect of Abrasive Tools in Galvanomechanical Treatment on the Roughness of the Deposited Chromium Layer, Solid State Phenomena. 284 (2018) 1178-1183.

DOI: 10.4028/www.scientific.net/ssp.284.1178

[14] D.M. Galimov, D.V. Ardashev, A.A. Dyakonov, Methods for determining the quality of galvanic chromium coating, Solid State Phenomena. 284 (2018) 1307-1312.

DOI: 10.4028/www.scientific.net/ssp.284.1307

[15] M.A. Dasoyan, I.Ya. Palmskaya, Equipping shops for electrochemical coating, Mechanical Engineering, Leningrad, (1979).

[16] M.F. Plekhanov, Calculation and design of devices for applying electroplated coatings, Engineering, Moscow, (1988).

[17] N.M. Antonov, Device for chromium plating and anodizing the internal surfaces of cylindrical parts, USSR Patent 629890/22 (1960).

[18] M.A. Schluger, V.A. Kazakov, Method for dimensional chromium plating of the inner surface of cylindrical parts, USSR Patent 862177/22-2 (1965).

[19] A.S. Zharkov, V.N. Belyaev, A.Yu. Kozlyuk, A.S. Andreyev, The method of electrolytic chromium plating of the inner surface of the pipes, Russian Federation Patent 2586957 2014151542 (2014).

[20] S.A. Prudius, E.M. Danilova, N.I. Nazaruk, T.I. Sergeeva, A method for applying a chromium coating to parts made of heat-resistant steels, Russian Federation Patent 2595195 2015102901 (2015).