Abstract The micro-arc oxidation (MAO) coatings were prepared in four different electrolyte systems, including mixed acid, phosphate, phosphate-aluminate and phosphate-silicate electrolytes. The friction and wear properties of MAO coatings in ambient air, seawater and four groups of saline solutions related to seawater were investigated. The results showed that the addition of silicate to phosphate could increase the density of the coating. The phosphate-aluminate ceramic layer exhibited the lowest wear rate in various environments. Additionally, the friction coefficient and wear rate of MAO coating in seawater were lower than those in ambient air, which was due to the boundary lubrication effect of seawater. Meanwhile, the presence of divalent metal salts in seawater made its lubricity better than other salt solutions.

中文翻译：

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人工海水中不同电解质体系制备微弧氧化涂层的摩擦学机理

摘要 在混合酸、磷酸盐、磷酸盐-铝酸盐和磷酸盐-硅酸盐电解质四种不同的电解质体系中制备了微弧氧化（MAO）涂层。研究了 MAO 涂层在环境空气、海水和与海水有关的四组盐水溶液中的摩擦磨损性能。结果表明，在磷酸盐中加入硅酸盐可以提高涂层的致密度。磷酸盐-铝酸盐陶瓷层在各种环境中的磨损率最低。此外，由于海水的边界润滑作用，MAO涂层在海水中的摩擦系数和磨损率低于环境空气中的摩擦系数和磨损率。同时，海水中二价金属盐的存在使其润滑性优于其他盐溶液。