AZ91D镁合金在硅酸盐体系下微弧氧化配方的优化

微弧氧化是一种先进的表面处理工艺。该技术具有工艺简单、清洁无污染、膜层均匀致密，材料适应性宽等特点，得到的微弧氧化膜既具备普通阳极氧化膜的性能，又兼有陶瓷喷涂层的优点，突破了传统的阳极氧化技术，是镁合金阳极氧化的重点发展方向，其中工艺参数特别是电解液的组成和浓度对微弧氧化膜结构和性能影响方面的研究具有极其重要的作用。本文采用4因素3水平的正交实验，从考察耐腐蚀性、膜层厚度和致密性出发，确定了AZ91D镁合金在硅酸盐体系下微弧氧化电解液的优选配方，并研究了在此配方条件下生成微弧氧化陶瓷膜的微观形貌和相结构。

Optimization of Electrolyte Formula of Micro-arc Oxidization for AZ91D Magnesium Alloys in Silicate Solutions

Micro-arc oxidization MAO is a new promising surface treatment method of forming ceramic coatings on metals. There are many properties in MAO process, such as simple and clean technique, uniformity and compact coating, wide adaptability for materials and so on. Since the micro-arc oxidized coating possesses the performance of the conversional anodic oxidization coating and the excellence of ceramic spray coating, MAO has become the most important developing aspect for magnesium and its alloy. Especially, the study that constitute and consistence of the electrolyte solution influence the structures and properties of ceramic coating play a main role. In the paper, adopting orthogonal test in silicate solutions for AZ91D magnesium alloys and observing the corrosion resistance, the uniformity of thickness and the compactness of the ceramic coating, the electrolyte solution of the micro-arc oxidization was determined. And the phase structure, surface morphology and character of section of micro-arc oxidized ceramic coating under the optimum condition were investigated.