Dynamics of microdischarges evolution during plasma electrolytic oxidation in alkaline and silicate-alkaline electrolytes

Q1 Engineering

International Journal of Lightweight Materials and Manufacture Pub Date : 2024-08-26 DOI:10.1016/j.ijlmm.2024.08.002

S.N. Grigoriev , V.B. Ludin , A.V. Apelfeld , B.L. Krit , I.V. Suminov , S.V. Zhukov , D.B. Chudinov , A.V. Zakabunin , A.V. Zheltuhin , N.S. Popov

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Abstract

The dynamics of microdischarges evolution during plasma electrolytic oxidation (PEO) of AMg6 aluminum alloy at anode-cathode mode in alkaline and silicate-alkaline electrolytes was investigated. Experimental studies were carried out using high-speed photography of surface being treated of the alloy synchronized with the registration of the electric current and voltage in the «alloy being treated ‒ electrolyte ‒ counter electrode » system. As a result, the ranges of electrical voltages at which surface being treated is affected by sporadic weak and plural weak, medium, as well as powerful anode microdischarges were identified. The conditions of sporadic cathode microdischarges displaying were determined. Differences in the dynamics of microdischarges evolution during PEO processes in alkaline and silicate-alkaline electrolytes were shown and determined their influence on the thickness, through porosity and microhardness of the formed coatings.

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碱性和硅酸盐碱性电解质等离子体电解氧化过程中微放电演变的动力学研究

研究了碱性和硅酸盐-碱性电解液中阳极-阴极模式下AMg6铝合金等离子体电解氧化（PEO）过程中的微放电演变动力学。在“待处理合金-电解液-反电极”系统中，采用高速摄影同步记录待处理合金表面的电流和电压，进行了实验研究。结果，确定了偶发弱放电和复数弱放电、介质微放电以及强阳极微放电对表面处理电压的影响范围。确定了零星阴极微放电显示的条件。研究了碱性和硅酸盐-碱性电解质PEO过程中微放电演化动力学的差异，并通过形成涂层的孔隙率和显微硬度确定了它们对厚度的影响。

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