氨基酸类有机添加剂对镁合金阳极氧化的影响及其作用机制研究  

Effect of Amino Acid on the Anodic Oxidation of Magnesium Alloy and Its Mechanism

作　　者：沟引宁[1,2] 张丁非[3] 易丹[1] 张春艳[1,2] 

机构地区：[1]重庆理工大学材料学院,重庆400054 [2]重庆理工大学重庆市模具工程技术研究中心,重庆400054 [3]重庆大学国家镁合金材料工程技术研究中心,重庆400044

出　　处：《稀有金属材料与工程》2017年第4期1103-1109,共7页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展计划("973"计划)(2013CB632200);国家十二五科技支撑计划项目(2011BAE22B01-3);科技部国际合作项目(2010DFR50010);重庆市教委科学技术研究项目(KJ1400928);国家自然科学基金(51201192)

摘　　要：为了进一步改善镁合金表面阳极氧化膜的质量和性能,在Na OH+Na_2SiO_3基础电解液中添加氨基酸类有机添加剂对AZ31镁合金进行阳极氧化,研究了氨基酸类有机添加剂对镁合金阳极氧化过程及氧化膜厚度、表面形貌、结构及耐蚀性的影响。探讨了有机添加剂在镁合金阳极氧化中的作用机制。结果表明:不同的氨基酸对镁合金阳极氧化过程及氧化膜性能影响不尽相同,其中乙二胺四乙酸和L-鸟氨酸醋酸盐可显著提高阳极氧化的击穿电压,起到明显的抑弧作用,大幅度提高了氧化膜的厚度、致密性和耐蚀性能。有机添加剂主要通过缓蚀、抑弧和表面活性剂3方面的综合作用来影响镁合金阳极氧化的过程及氧化膜的性能。To further improve the quality and performance of its oxidation film, AZ31 magnesium alloy was anodized in NaOH＋Na2SiO3 base electrolyte with different amino acids as organic additives. The effects of different amino acids on the thickness, morphology, structure and corrosion resistance of the anodized films were investigated. The mechanisms of organic amino acids additives were discussed. Results show that there are different effects on the anodizing of magnesium alloy after adding different amino acids in electrolyte. EDTA and L-Orn have a remarkable effect on arc restraining, which result in an increase in the thickness of anodized films and a decrease in the surface micro-hole size and porosity, and finally the improvement in corrosion resistance. Organic additives, mainly through the combined effect of inhibition, arc suppression, and surfactant, affect the anodizing process and the performance of the oxide film.

关 键 词：氨基酸 有机添加剂 镁合金 阳极氧化 

分 类 号：TG174.4[金属学及工艺—金属表面处理]