摘要
电流密度是影响微弧氧化膜层结构和性能的主要因素之一。采用测厚仪、扫描电镜(SEM)、电化学测试等手段研究了AM60B镁合金在不同电流密度下硅酸盐溶液中微弧氧化膜层的结构和耐蚀性能。结果表明,随电流密度的增大,氧化膜厚度呈线性增加;氧化膜的表面微孔数目减少,微裂纹扩展程度增大。电化学腐蚀测试结果显示,电流密度9.0A/dm2下生成的氧化膜耐蚀性最好,主要与膜层较致密的微观结构有关。
Current density is one of the key factors influencing the structure and properties of microarc oxidation coatings.Thus microarc oxidation coatings were prepared on AM60B magnesium alloy from a silicate electrolyte at different current density.The effects of the current density on the structure and corrosion resistance of the microarc oxidation coatings were investigated using a thickness meter,scanning electron microscope,and electrochemical device.The results showed that the coating thickness increased linearly with the increasing current density.The micro-structure of the coatings was highly dependent on the current density.The number of the micropores on the coating surface decreased and the micro-cracks were enlarged with increasing current density.Moreover,the coating formed at a current density of 9.0 A/dm2 had the best corrosion resistance,which was attributed to its compact microstructure.
出处
《材料保护》
CAS
CSCD
北大核心
2007年第8期24-26,29,共4页
Materials Protection
基金
创新研究群体科学基金(50421502)
关键词
镁合金
微弧氧化
电流密度
微观结构
耐蚀性
magnesium alloy
microarc oxidation
current density
microstructure
corrosion resistance
