交流电压对AZ91D 镁合金阳极氧化膜层的影响 - 中国有色金属学报.PDF

18 8 2008 8 Vol.18 No.8 The Chinese Journal of Nonferrous Metals Aug. 2008 1004-0609(2008)08-1472-07 AZ91D ( 100083) AZ91D (170 V)170 V 170 V AZ91D TG 146.2; TG 178; TQ 153.6 A Effect of AC voltage on anodic film of AZ91D magnesium alloy WANG Xi-mei, ZHU Li-qun (School of Materials Science and Engineering, Beihang University, Beijing 100083, China) Abstract: The anodic films on AZ91D magnesium alloy were prepared in the electrolyte of Na SiO and silica sol by AC 2 3 sources. The effect of anodic voltage on the surface morphologies, growth rate and corrosion resistance of anodic films was investigated. The results show that the anodic reaction is rapid and the current increases quickly and the specimen’s surface is bestrewed with arc discharge when the anodic voltage exceeds 170 V. When the anodic voltage is less than 170 V, bisque sparks appear on the surface of magnesium alloy uniformly. The anodic films are smooth, uniformity and compact. Moreover, the growth rate and corrosion resistance of the anodic films is improved with increasing anodic voltage. When the anodic voltage is more than 170 V, the anodic films become coarse and their corrosion resistance is worse though their growth rate is extremely increased. Key words: AZ91D magnesium alloy; anodic oxidation; voltage; AC power source [6−8] [1−2]