摘要
采用微弧氧化和磁控溅射复合技术在镁合金表面制备高硬度镀层。通过X衍射仪、扫描电镜、测厚仪和电化学工作站等分析手段对镀层的组织结构和性能进行研究。结果表明,镀层由MgO、MgSiO 3、CrN和Cr 2N等物相组成,自腐蚀电位从-1.69 V上升到了-0.9 V,极化电阻从3.4×10^3 ohm·cm 2增加到了4.6×10^5 ohm·cm ^2,腐蚀电流密度从1.2×10^-5 A/cm^ 2降低至8.2×10^-8 A/cm ^2,耐腐蚀性能得到了显著提高。
The micro-arc oxidation technique and magnetron sputtering technique are used to make high-hardness complex film on magnesium alloy in this paper.The microstructures and corrosion resistance of the film were studied by X-ray diffraction,scanning electron microscope and eddy current thickness meter,and corrosion behavior of the film was investigated by electrochemical methods.The results show that the film was mainly composed of MgO、MgSiO3、CrN and Cr2N.The corrosion potential and polarization resistance of base alloy increase respectively from-1.69V and 3.4×10^3(ohm·cm ^2)to-0.9V and 4.6×10^5(ohm·cm ^2)and its corrosion current density decreases from 1.2×10^-5(A/cm ^2)to 8.2×10^-8(A/cm^ 2)after addition of high-hardness complex film on magnesium alloy,which shows high-hardness complex film can improve obviously corrosion protection of magnesium alloy.
作者
徐振丽
Xu Zhenli(Jiashan County Productivity Promotion Center,Jiashan 314100,China)
出处
《农机使用与维修》
2020年第1期30-32,共3页
Agricultural Machinery Using & Maintenance
关键词
镁合金
复合镀层
微观结构
耐腐性
magnesium alloy
complex film
microstructure
corrosion resistance
