铝在磷酸和钨酸钠体系中的高压氧化行为  

HIGH VOLTAGE ANODIZATION BEHAVIOUR OF ALUMINUM IN MIXED ELECTROLYTES OF PHOSPHORIC ACID AND SODIUM TUNGSTATE

作　　者：刘建平[1] 旷亚非[1] 许岩[1] 侯朝辉[1] 

机构地区：[1]湖南大学化学化工学院,长沙410082

出　　处：《中国腐蚀与防护学报》2001年第4期234-239,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：机械工业发展基金( 97FA0 5 0 4 )资助项目

摘　　要：对铝在磷酸和钨酸钠体系中的高压氧化行为进行了研究 .结果表明其氧化行为可以分为四个阶段 ,即常规阳极氧化阶段、膜层沉积的初始阶段、快速增厚阶段和缓慢生长阶段 .第一阶段形成的氧化膜与在单独的磷酸或钨酸钠体系中形成的氧化膜有所不同 .扫描电镜 (SEM )结果表明 ,氧化膜微观结构呈“羊毛线头” ,这些羊毛线头在电压升高时聚集、交织成网架结构 ,为膜层的沉积作准备 .溶液中的电解质粒子 ,如WO2 - 4、PO3 - 4等阴离子 ,在界面电化学及焦尔热的联合作用下絮集于网架状氧化膜表面 ,并经浓缩、凝聚、脱水和快速冷却 。High voltage anodization of aluminum in mixed electrolytes of phosphoric acid and sodium tungstate could be divided into four stages: conventional anodization stage,initial stage of anodic deposition,rapid growth stage and slow growth stage.The film formed during the first stage was different from that formed either in phosphoric acid or sodium tungstate electrolyte.SEM results showed that it had a woolen like microstructure and quickly interlaced into a web in the second stage with the increase of the voltage.The electrolytic species such as PO 3- 4?WO 2- 4 and et al,aggregated toward the gel formed near the oxide and transformed to the noncrystalline film through concentration,coagulation,dehydration and refrigeration under the combined action of electrochemical and Joule heat effects.

关 键 词：铝 高压阳极氧化 非晶体转化膜 磷酸 钨酸钠 

分 类 号：TG174.451[金属学及工艺—金属表面处理]