电参数对镁合金微弧氧化膜层生长的影响及耐蚀性研究

Effects of Electrical Parameters on Growth of Mg Alloy Micro-arc Oxidation Coating and Corrosion Resistance

利用微弧氧化技术对AZ91D镁合金在硅酸盐和锆盐溶液中进行表面陶瓷化处理,发现电参数对膜层厚度有很大影响。并采用IM6e型电化学工作站,对微弧氧化镁合金进行电位极化曲线测量。通过电化学测量对微弧氧化镁合金的腐蚀行为进行分析。用处理好的镁合金进行腐蚀实验,用失重法和极化法测试其耐蚀性,发现电解液中锆元素会大大提高膜层的耐蚀性。同时通过XRD分析发现硅酸盐电解液中制备的陶瓷膜主要由Mg2SiO4、MgO和MgF2等相组成,锆盐电解液中制备的陶瓷膜主要由MgO、MgF2和ZrO2相组成。

The ceramic surface treatment of AZ91D alloy was done in silicate and zirconium salt solution using micro-arc oxidation technology. The electrical parameters on the film thickness have a great influence. The micro-arc polarization curves of Mg alloy were measured using 1M6e electrochemical workstation. The corrosion behavior of micro-arc Mg alloy was analyzed by electrochemical measurement. With treated magnesium alloys doing corrosion experiments, the corrosion resistance was analyzed using mass loss method and polarization method. The results show that the zirconium element can greatly improve the corrosion resistance of the film. Also found by XRD analysis of silicate salt electrolyte, ceramic membrane is mainly constituted by Mg2SiO4, MgO, MgF2 phase, etc., zirconium salt electrolyte ceramic membrane is mainly constituted by MgO, MgF2 and ZrO2 phase.