The effect of electrolysis conditions during microarc oxidation  on the phase-structural state, hardness and corrosion resistance  of magnesium alloys

V.V. Subbotina; V.V. Belozerov

doi:10.15330/pcss.21.3.545-551

Authors

V.V. Subbotina National Technical University «Kharkiv Polytechnic Institute»
V.V. Belozerov National Technical University «Kharkiv Polytechnic Institute»

DOI:

https://doi.org/10.15330/pcss.21.3.545-551

Keywords:

microarc oxidation, ceramic coatings, alloy MA5, microstructure, X-ray phase analysis, microhardness, coating thickness, corrosion tests

Abstract

By the method of microarc oxidation for different types of electrolytes (which include KOH, Na₂SiO₃, Н₂О₂, NaOH, NaAlO₂, Na₅P₃O₁₀, NaF) and electrolysis conditions, multifunctional ceramic coatings on a magnesium alloy were obtained. The phase composition of the coating includes magnesium oxide (MgO), spinel MgAl₂O₄, Mg₂SiO₄ and Мg₃(РО₄)₂compounds. The phase composition of the coatings is determined by the composition of the electrolyte. The obtained MAO coatings provide high hardness, which is 1500 to 7300 MPa, as well as high corrosion resistance. The results obtained make it possible to recommend MAO coatings on magnesium alloys both as an external (functional) layer and for the formation of an underlayer for the subsequent application of protective coatings (varnishes, polymers, polytetrafluoroethylene, in particular).

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