中文摘要：

采用恒流控制模式在Na2SiO，电解液体系下制得6061铝合金微弧氧化膜，研究了电流密度对微弧氧化陶瓷膜结构和性能的影响。为了提高膜层性能采用了一种新的电流模式，并与恒流条件下的陶瓷层显微结构和耐腐蚀性进行了比较。结果表明，随着电流密度的不断增大，陶瓷膜的厚度、表面粗糙度也随之增大，耐腐蚀性能逐渐降低，硬度则呈现先增大后减小的趋势，膜层主要由a-A12O3和7-A12O3组成，采用新的电流模式得到的陶瓷膜显微裂纹明显减少，耐腐蚀性明显提高。

英文摘要：

Micro-arc oxidation coating on 6061 aluminum alloy was prepared in a Na2SiO3 contain- ing electrolyte by a constant current control mode, and the effect of current density on the micro- structure and performance of micro-arc oxidation ceramic coating was studied by a series of tests. Results for the above coatings show that their thickness and surface roughness increase with the in- creasing current density, however, their corrosion resistance decrease, and their hardness increases first and then decreases with the increasing current density. The ceramic coatings are mainly com- posed of ~t-Al：O3 and 7-A1203. As a comparison, a novel current control method was adopted to pre- pare a micro-arc oxidation coating. Accordingly, the amount of micro-cracks was significantly re- duced, and the corrosion resistance was obviously enhanced for the coating prepared by the new mode.