材料期刊网

对AZ91D镁合金进行了表面微弧氧化处理,研究了处理前后合金在流量为2mL·min-1的模拟体液中浸泡5d后的耐腐蚀降解性能;对浸泡5d的微弧氧化镁合金在流动模拟体液中进行了摩擦磨损试验,研究了载荷、转速、磨损时间对其摩擦磨损性能的影响,分析了其磨损形貌及规律.结果表明:微弧氧化膜为多孔结构,局部有细小裂纹.微弧氧化镁合金的耐腐蚀降解性能明显优于镁合金基体的.浸泡5d后的微弧氧化镁合金在模拟体液中进行磨损时,其摩擦因数随载荷的增大而增大,随转速增大、磨损时间的延长而减小;磨损量随载荷、转速增大和磨损时间延长而增大;低速时以黏着磨损为主,高速时以剥层磨损为主.

The micro-arc oxidation was conducted on AZ91D magnesium alloy surface,and then the corrosive degradation resistance of the non-oxidized and micro-arc oxidized alloys was studied during immersion in the simulated body fluid of 2 mL·min-1 for 5 d.The friction and wear experiment in the flowing simulated body fluid was performed on the micro-arc oxidized magnesium alloy with immersion for 5 d The effects of load,rotating speed and wear time on the friction and wear properties were investigated and the wear morphology and mechanism were analyzed.The results show that the micro-arc oxide film had a porous structure and local tiny cracks.The corrosive degradation resistance of the micro-arc oxidized magnesium alloy was better than that of the magnesium alloy substrate.During the wear of micro-arc oxidized magnesium alloy with 5 d immersion in the simulated body fluid,the friction coefficient increased with the increasing load and decreased with the increasing rotating speed and wear time,while the wear losses increased with the increase of the load,rotating speed and wear time.The wear mechanism was mainly adhesive wear at the low rotating speed while delamination wear at high rotating speed.