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在以Na2SiO3为主体的电解液中,利用微弧氧化技术在触变成形AZ91D镁合金表面原位生长出厚60～65μm的膜层,用UMT-2MT型球-块往复式摩擦试验机对膜层的干滑动磨损行为进行了研究。用SEM、XRD分析了微弧氧化陶瓷层磨损前后的表面形貌和相组成。结果表明:微弧氧化膜层是由Mg2SiO4、Mg、MgO、MgO2和Al3.16Mg1.81组成的陶瓷层;在滑动磨损过程中,随着载荷的增大,摩擦系数先增大后减小,磨损率则先缓慢增长后迅速增长;随着频率的增加,摩擦系数逐渐降低,磨损率先上升后缓慢下降,磨损机制由微切屑磨损向磨粒磨损转变。
In Na2SiO3 as the main electrolyte, the micro-arc oxidation technology was used to form in-situ 60 ~ 65μm thick film on the surface of thixoformed AZ91D magnesium alloy by UMT-2MT ball-block reciprocating tribometer Film dry sliding wear behavior were studied. The surface morphology and phase composition of MAO coatings before and after wear were analyzed by SEM and XRD. The results show that the micro-arc oxidation layer is a ceramic layer composed of Mg2SiO4, Mg, MgO, MgO2 and Al3.16Mg1.81. In the sliding wear process, the friction coefficient first increases and then decreases with the increase of load, The wear rate firstly increased slowly and then increased rapidly. With the increase of the frequency, the friction coefficient decreased gradually, the wear rate firstly increased and then slowly decreased, and the wear mechanism changed from micro-chip wear to abrasive wear.