Methods for Determining the Quality of Galvanic Chromium Coating

Abstract:

The surface and microsections of the cross-section of the chromium coating samples were studied. The microhardness of the coating and the base material was tested, their metallographic studies were conducted. The analysis of the microstructure showed that the base metal of 45 and 38XA steel of all samples is in the normalized state. The analysis of the microstructure of the samples subjected to surface HFC hardening (high frequency currents) showed that the temperature of heating during quenching is insufficient, and it leads to a lower strength and hardness of the layer. The sample with a lower hardness of the chromium coating has a higher coating viscosity and resistance to wear. The sample with the highest microhardness of the coating is characterized by increased brittleness. The hardness of the metal substrate and its structure does not affect the properties of the chromium coating layer.

• Periodical: Solid State Phenomena (Volume 284)
• Pages: 1307-1312
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.284.1307
• Online since: October 2018
• Authors: D.M. Galimov, Dmitry V. Ardashev*, Aleksandr A. Dyakonov
• Keywords: Chromium Coating, Metallography, Microhardness

References

[1] M.A. Shluger, Galvanic coatings in mechanical engineering: Handbook. In 2 volumes, Mashinostroenie, Moscow, (1985).

[2] S. Davis, A. James, Electrochemical Dictionary, World, (1979).

[3] M.A. Dasoyan, I.Ya. Palmskaya, Equipment of electrochemical coatings shops, third ed., Mechanical Engineering, Leningrad, (1979).

[4] N.P. Fedotiev, Applied Electrochemistry, Chemistry, (1962).

[5] L.G. Borisova, Methods of researching materials and processes: Methodological guidelines for independent work, St. Petersburg Mining University, Saint Petersburg, (2016).

[6] GOST 9.302 - 88. Metallic and non-metallic coatings. Control methods. Gosstandart, (1990).

[7] P.M. Vyacheslavov, N.M. Shmelev, Methods of testing electrochemical coatings, Mechanical Engineering, Leningrad, (1977).

[8] K. I. Godovskaya, L. Tolstaya, Laboratory workshop on technical analysis and quality control of electrochemical coatings, Mechanical Engineering, Moscow, (1984).

[9] K.E. Rumyantseva, Physical and technological properties of coatings: Manual, GOU VPO ISCTU, Ivanovo, (2007).

[10] Kh. K. Baskaev, A.I. Samokhotsky, Metal Science and Heat Treatment of Metals: A Teaching and Methodological Manual on Diploma Projecting: A Textbook for Technical Schools, Mechanical Engineering, Moscow, (1966).

[11] A.D. Assonov, Technology of thermal processing of machine parts, Mechanical Engineering, Moscow, (1969).

[12] V.M. Nikiforov, Technology of metals and other structural materials. - 2 nd ed., revided and added, Higher education. school, Moscow, (1977).

[13] A.E .Leikin, B.I. Rodin, Material science, High School, Moscow, (1971).

[14] Yu. M. Lakhtin, V.P. Leontieva, Material Science, Mechanical Engineering, Moscow, (1990).

[15] D.N. Garkunov, Tribotechnics, (1985).

[16] A.G. Kalmykov, Yu. I. Golovin, V.F. Terentyev et al., Methods for determining the hardness of metallic materials: Educational and reference manual, VSTU Publishing House, Voronezh, (2000).

[17] A.I. Korotin, Technology of drawing galvanic coatings: Manual, Higher School, Moscow, (1984).

[18] I.S. Yasnikov, Yu.S. Nagornov, I.V. Gorbachev, R.R. Mikeev, P.S. Sadovnikov, N.Yu. Shubchinskaya, A.V. Aminarov, Scanning electron microscopy as a method of studying microscopic objects of electrolytic origin, Fundamental research, 1-3 (2013).

[19] М.М. Krishtal, I.S. Yasnikov, V.I. Polunin et al., Scanning electron microscopy and X-ray spectral microanalysis in practical applications, Technosphere, Moscow, (2009).

[20] D. Brandon, U. Kaplan, Microstructure of materials. Methods of research and control, Technosphere, Moscow, (2004).

[21] Yu. A. Bykov, S.D. Karpukhin, M.K. Boichenko et al., Raster electron microscopy and X-ray spectral analysis. Apparatus, principle of operation, application, MSTU of N.E. Baumana, Moscow, (2003).