小电流镀铜对阳极氧化AZ31镁合金耐蚀性的影响

Influence of plating Cu at low current density on the corrosion resistance of the anodized AZ31 magnesium alloy

研究了小电流镀铜封孔对阳极氧化AZ31镁合金耐蚀性能的影响.AZ31镁合金阳极氧化后,在传统的镀铜液中进行阴极小电流处理.SEM、EDS和XRD分析结果表明,阴极小电流处理后,在阳极氧化膜的多孔层中发生了铜的沉积.在质量分数为3.5%NaCl水溶液中测试的极化曲线表明,AZ31镁合金阳极氧化后进行小电流镀铜处理,可以提高自腐蚀电位,降低自腐蚀电流密度,使耐蚀性能得到显著提高.

The influence of role sealing produced by plating Cu at low current density on the corrosion resistance of the anodized AZ31 magnesium alloy was studied. After anodization, AZ31 specimens were treated as a cathode with low current density in a traditional solution for Cu electroplating. The experimental results of SEM, EDS and XRD show that after such treatment at low current density, Cu is deposited in the porous layer of anodized film. The polarizing curves measured in 3.5 % sodium chloride solution show that after plating Cu at low current density the corrosion potential of the anodized AZ31 magnesium alloy increases, and its corrosion current density reduces correspondingly, which indicate that the corrosion resistance of the anodized AZ31 magnesium alloy increases.