Abstract In this study, plasma electrolytic oxidation (PEO) composite coating on AZ31B magnesium alloy was performed in the suspension of glass particles (particle size of 500 nm). The effect of glass particle concentration on corrosion and wear behavior of coatings were investigated by potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and pin on disk tests. The results showed that the addition of glass particles with 5 g/l concentration enhanced corrosion and wear resistance of the coating due to the filling or sealing coating pores with molten glass. A uniform surface of the composite coating is obtained (0.1 µm roughness average) at a concentration of 5 g/l. Along with the further increase in concentration, the preferred locations in the coating process are decreased leading to the non-uniform coating. This consequently increases the un-melted particles on the surface. Corrosion current density at the concentration of 5 g/l glass particles decreased up to five times rather than coating without glass particles (from 13.71 to 2.64 µA.cm 2 ). Also wear rate at an optimum concentration of glass particles decreased from 0.48 to 0.05 µg/N.m.

中文翻译：

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AZ31B玻璃密封PEO复合涂层的单阶段生产

摘要 本研究在玻璃颗粒（粒径500 nm）悬浮液中对AZ31B镁合金进行等离子电解氧化（PEO）复合涂层。通过动电位极化 (PDP)、电化学阻抗谱 (EIS) 和针盘试验研究了玻璃颗粒浓度对涂层腐蚀和磨损行为的影响。结果表明，由于熔融玻璃填充或封闭涂层孔隙，添加浓度为 5 g/l 的玻璃颗粒增强了涂层的耐腐蚀性和耐磨性。在 5 g/l 的浓度下获得了复合涂层的均匀表面（平均粗糙度为 0.1 µm）。随着浓度的进一步增加，涂层过程中的优选位置减少，导致涂层不均匀。这因此增加了表面上未熔化的颗粒。与没有玻璃颗粒的涂层相比，5 g/l 玻璃颗粒浓度下的腐蚀电流密度降低了五倍（从 13.71 到 2.64 µA.cm 2 ）。此外，在最佳玻璃颗粒浓度下，磨损率从 0.48 µg/Nm 降低到 0.05 µg/Nm