Self-coloring of coatings upon two-stage plasma-electrolytic treatment of AD31 alloy

• A.G. Rakoch¹, E.P. Monakhova², P.N. Grishin¹, V.A. Bychkov¹, M.V. Zheleznyi³, A.E. Kutyrev⁴ and D.P. Catenda¹

¹ National Research Technological University MISIS, Leninsky pr. 4, 119049 Moscow, Russian Federation
² Certification Center LLC, Moscow, Russia, Amurskaya Street, 9/6c8, 107497 Moscow, Russian Federation
³ A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Russian Academy of Sciences, Leninsky pr., 49, 119334 Moscow, Russian Federation
⁴ Federal State Unitary Enterprise “All-Russian Research Institute of Aviation Materials” of the National Research Center “Kurchatov Institute”, 17 Radio st., 105005 Moscow, Russian Federation

Abstract: A technique for the formation of anticorrosive wear-resistant plasma-electrolytic coatings with granite crumb texture on the surface of AD31T1 alloy, which is widely used in construction industry, have been developed. The technique is based on the two-stage plasma-electrolytic treatment of this alloy: a porous coating with non-uniform thickness is obtained at the first stage, while at the second stage a large number of through pores of the coating are closed with inclusion of cobalt-containing compounds. It has been found that in order to preserve the texture of granite crumbs of the coating, plasma-electrolytic oxidizing (PEO) should be carried out until the sample size and coating thickness cease to grow. At a long duration of PEO of samples from AD31T1 alloy, the color of the coating tends to black. Electrochemical tests show a high anticorrosive capability of coatings with granite crumb texture. Coatings with granite crumb texture on samples from AD31T1 demonstrate a high wear resistance.

Keywords: plasma-electrolytic treatment, aluminum alloys, decorative coatings, granite crumb texture, wear and corrosion resistance

Int. J. Corros. Scale Inhib., 2024, 13, no. 3, 1877-1890
doi: 10.17675/2305-6894-2024-13-3-31

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