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采用恒流控制模式在Na2SiO3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α-Al2O3和γ-Al2O3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。
A constant current control mode was used to prepare 6061 aluminum alloy microarc oxide film under Na2SiO3 electrolyte system. The effect of current density on the structure and properties of MAO ceramic film was studied. In order to improve the performance of the film using a new current mode, and constant current ceramic ceramic layer under the microstructure and corrosion resistance were compared. The results show that with the increasing of the current density, the thickness and surface roughness of the ceramic film also increase, the corrosion resistance decreases and the hardness increases first and then decreases. The film mainly consists of α- Al2O3 and γ-Al2O3. The microcracking of the ceramic film obtained by the new current mode is obviously reduced and the corrosion resistance is obviously improved.