摘要
采用直流和直流脉冲电源对AZ91D镁合金进行微弧氧化处理,得到具有相同厚度的氧化膜,通过显微硬度测定、扫描电镜观察和极化曲线测试等手段研究了不同电源对微弧氧化膜层性能的影响。结果表明:直流电源下膜层的生长速率大于脉冲直流电源下的;用不同电源处理得到的氧化膜,硬度基本相同;脉冲直流电源下氧化膜的表面形貌、耐蚀性好于直流电源下的,高频下氧化膜的表面形貌、耐蚀性优于低频下的氧化膜。
Micro-arc oxidation coatings were prepared on AZ91D magnesium alloy using DC and pulsed DC power sources.The influence of the power source modes on the properties of the micro-arc oxidation coatings was investigated by means of microhardness testing,scanning electron microscopy,and polarization curve measuring,aiming at comparing the growth rate,microhardness,surface topography and corrosion resistance.It was found that the micro-arc oxidation coating prepared from the DC power source had a greater growth rate than that prepared from the pulsed DC power source,while the microhardness of the coatings was almost independent on the power source mode.Moreover,the micro-arc oxidation coating prepared from the pulsed DC power source had better surface topography and corrosion resistance than the one prepared from the DC power source,and high frequency pulsed DC power source was beneficial to improving the surface topography and corrosion resistance of the coatings.
出处
《材料保护》
CAS
CSCD
北大核心
2007年第6期42-44,共3页
Materials Protection
基金
国家自然科学基金项目(10275020)
关键词
直流和直流脉冲电源
镁合金
微弧氧化
极化曲线
性能
DC and pulsed DC power source
magnesium alloy
micro-arc oxidation
polarization curve
properties
