电源参数及KF和SiC纳米颗粒对ZK60 镁合金微弧氧化膜的影响

对ZK60镁合金在硅酸盐体系、不同的电源参数情况下进行微弧氧化研究.通过实验分析,得到如下结果:微弧氧化时间对膜层的耐蚀性能有较大的影响.当膜层生长到一定厚度后,耐蚀性随微弧氧化时间的延长而变差;当电流较小时,膜层均匀,孔洞较小,当电流增大时,膜层粗糙,孔洞变大,并且容易产生裂纹;KF对镁合金微弧氧化膜层的生成有很好的促进作用,当加入KF为12g/L时,膜层厚度较没加KF增加一倍多,耐蚀性也得到很大提高.当F-浓度过高时,生成的膜层粗糙,而且容易脱落.在电解液中加入纳米SiC颗粒对微弧氧化膜层的厚度和耐蚀性无明显影响.

The Influence of Electric Parameters, KF and SiC Nano Particles on the Properties of the Micro-arc Oxidation Films of ZK60 Magnesium Alloy

The micro-arc oxidation of ZK60 magnesium alloy was carried out in silicate electrolyte systems with different electric parameters.Through experimental analysis,the results are as follows: Time has a greater impact on the corrosion resistance of the coatings.When the film grows to a certain thickness,the corrosion resistance of the coating declines with the increase of time.With the increase of current intensity,the morphology of the coating becomes rougher,the micro hole becomes bigger and micro cracks are evident.The concentration of KF in the electrolyte has a great influence on the quality of PEO films.With the concentration of 12 g/L KF in the electrolyte,the thickness of the film is nearly twice of the film without KF addition,and the corrosion resistance of the film has also been greatly improved.When the concentration of fluoride is too high,the film is easy to delaminate from the sample surface.The addition of nano-SiC particle in the electrolyte has no obvious effect on the corrosion and thickness of the micro arc films.