镁及镁合金环保型阳极氧化工艺研究  

Study of environmentally friendly anodizing process of Mg and its alloys

作　　者：邓姝皓[1] 易丹青[1] 毛俊华[1] 龚竹青[2] 苏玉长[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学冶金科学与工程学院,长沙410083

出　　处：《电镀与涂饰》2005年第1期15-19,共5页Electroplating & Finishing

基　　金：湖南省科技厅重大专项(04GK1008-2)

摘　　要：　研究了镁及镁合金无铬、无磷的环保型阳极氧化工艺。测定了镁阳极氧化的稳态伏安曲线和电流密度-时间曲线。通过研究氧化电压、电解液中NaOH和Al(OH)3的浓度、电解液温度、氧化时间等对镁阳极氧化成膜的影响,确定了最佳工艺条件。分析了最佳工艺条件下得到的镁合金氧化膜的成分、结构与表面形貌,并对镁合金基体与氧化膜的耐腐蚀性能进行了比较。结果表明,在环保型阳极氧化液中得到的镁合金氧化膜由镁和铝的氧化物组成,其色泽光滑,结构致密,与镁合金基体相比硬度与耐腐蚀性能都大为提高。An environmentally friendly anodizing process of Mg and its alloys based on the electrolyte solution that contains no chromium and phosphate was studied, and the steady-state voltammetry curve and current density-time curve were determined. By testing the influences such as galvanic voltage, concentration of NaOH and Al(OH)3 in electrolyte solution, operating temperature, anodizing time, etc., on the anodizing films of Mg and its alloys, and the best process conditions were obtained. The composition, structure and surface micrograph of the anodizing films of Mg and its alloys gained under the best process conditions were analyzed, and the corrosion resistance of the anodizing films and Mg alloys matrix was compared. Results show that the anodizing films of Mg and its alloys gained in environmentally friendly anodizing solution are composed of oxides of Mg and Al alloys, and have even luster and compact structure. Both its hardness and corrosion resistance are enhanced compared with Mg alloy substrates.

关 键 词：镁及镁合金 环保型 阳极氧化 氧化膜 

分 类 号：TG113.26[金属学及工艺—物理冶金]