AZ91D铸造镁合金交流脉冲双极微弧电沉积陶瓷膜

利用交流脉冲方法在AZ91D铸造镁合金表面成功实现阴、阳极微弧电沉积陶瓷膜,并使用SEM和XRD等手段对陶瓷膜的厚度、组织形貌、成分、结构和耐蚀性作了相应研究分析.结果表明,应用交流脉冲方法不仅能够在AZ91D铸造镁合金上实现阴、阳双极微弧电沉积陶瓷膜,同时在阴、阳极陶瓷膜中电沉积有稀土元素Ce.通过比较动电位扫描极化曲线和交流阻抗分析发现阴、阳极微弧氧化处理后AZ91D镁合金的耐蚀性得到显著提高.

Microarc Electrodeposition of Ceramic Coatings on Double Electrodes of AZ91D Magnesium Alloy by AC Pulse Method

It was carried out successfully to microarc electrodeposit ceramic coatings on the anode and cathode of AZ91D magnesium cast alloy with AC pulse method. The thicknesses, morphologies, composition and micro-structures of the coatings were studied by scanning electron microscopy (SEM) and X ray diffraction (XRD). Rare earth element as Ce can deposit in the anode and cathode ceramic coatings on AZ91D cast alloy besides that both electrodes have formed the same characteristic ceramic coatings. By comparing the electrochemical impendence spectroscopies (EIS) and potentiodynamic scanning polarization curves of the anode and cathode coatings, it was found that microarc oxidation (MAO) coatings on the anode and cathode of AZ91D have better corrosion resistance than that of bare AZ91D magnesium cast alloy.