( 1.湖南大学化学化工学院, 长沙 410082;
2. 湖南大学 材料科学与工程学院, 长沙 410082)
摘 要: 以NH4H2PO4、 NaF和NaOH组成基础电解液, 采用有机胺作为抑弧剂,对AZ91D镁合金高压阳极氧化过程进行了研究。结果表明: 有机胺对镁合金的阳极氧化有着显著的抑弧效应, 可使镁合金的阳极火花放电电压提高50~80V。 在抑制阳极发生弧光放电的状态下, 镁合金表面可以沉积一层致密、 具有较高硬度和优良耐蚀性能的氧化膜层。分析了有机胺对氧化膜层性能和表面形貌的影响以及不同有机胺在镁合金阳极氧化过程中的抑弧能力, 并初步探讨了有机胺在镁合金阳极氧化过程中的抑弧机理。
关键字: 镁合金; 有机胺; 阳极氧化; 抑弧效应
( 1. College of Chemistry and Chemical Engineering,
Hunan University,Changsha 410082, China;
2. College of Materials Science and Engineering,
Hunan University,Changsha 410082, China)
Abstract: The anodizing behavior of AZ91D magnesium alloys in base electrolyte containing NH4H2PO4, NaF and NaOH at high voltage was investigated by using organic amine as additive of restraining sparking. The results show that the organic amines have remarkable effect on anodizing of magnesium alloys. Under restraining sparking, a compact oxidation film, which has high hardness and good corrosion resistance, can be deposited on the surface of magnesium alloys. The effects of organic amines on properties and morphologies of oxidation film, and on abilities of restraining sparking were studied in detail. Moreover, the mechanism of restraining sparking of organic amine about anodizing of magnesium alloys was discussed.
Key words: magnesium alloys; organic amine; anodizing; effect of restraining sparking