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首页> 外文期刊>Key Engineering Materials >Investigation of the Anti-corrosion Ceramic Coating Formed on AZ91D Magnesium Alloy by Micro-arc Oxidation
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Investigation of the Anti-corrosion Ceramic Coating Formed on AZ91D Magnesium Alloy by Micro-arc Oxidation

机译：微弧氧化在AZ91D镁合金上形成防腐蚀陶瓷涂层的研究

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摘要

A new micro-arc oxidation method with a home-made asymmetric alternating-current (ac) power supply for forming an anti-corrosion ceramic coating on AZ91D magnesium alloy was presented, and two different silicate-based and aluminate-based preparing solutions were introduced to coating formation. The effect of many processing parameters on the growth and performance of the formed ceramic coating was investigated. It was found that the electrolyte concentration, current density, treating time duration and other parameters have significant influence on the coating morphology and anti-corrosion performance. Through the polarization curve test, it showed that the coating oxidized in silicate solution has better corrosion-resistance due to its continuous and compact structure than that formed in aluminate solution. The morphology and microstructure of the coating were analyzed through SEM, XRD technology. The coating consists of two layers, i.e., loose layer and compact layer. The compositions and phase structures varied with electrolytes, and it was found that the micro-arc oxidation coating prepared in silicate solution is composed of MgO and Mg_2SiO_4, while the coating prepared in aluminate is mainly composed of MgAl_2O_4.
机译：提出了一种采用自制不对称交流电源的微弧氧化新方法，以在AZ91D镁合金上形成防腐蚀陶瓷涂层，并介绍了两种不同的硅酸盐基和铝酸盐基制备溶液。涂层形成。研究了许多工艺参数对所形成的陶瓷涂层的生长和性能的影响。结果表明，电解液浓度，电流密度，处理时间等参数对涂层的形貌和耐蚀性能有重要影响。通过极化曲线测试表明，在硅酸盐溶液中氧化的涂层由于其连续而致密的结构比在铝酸盐溶液中形成的涂层具有更好的耐腐蚀性。通过SEM，XRD技术分析了涂层的形貌和微观结构。涂层由两层组成，即疏松层和致密层。组成和相结构随电解质的变化而变化，发现在硅酸盐溶液中制备的微弧氧化涂层由MgO和Mg_2SiO_4组成，而在铝酸盐中制备的涂层主要由MgAl_2O_4组成。

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