两种成膜促进剂对Mg-Gd-Y-Zr镁合金表面铈盐转化膜耐蚀性能的影响  

Effect of Two Kinds of Accelerants on Corrosion Resistance of Cerium-based Conversion Film on Mg-Gd-Y-Zr Mg

作　　者：古锐[1] 张新明[1] 陈明安[1] 易建龙[1] 

机构地区：[1]中南大学材料学院,长沙410083

出　　处：《腐蚀与防护》2009年第11期839-842,共4页Corrosion & Protection

摘　　要：为了替代Cr6+化学转化膜处理工艺,在Mg-Gd-Y-Zr镁合金表面分别用苯甲酸钠和碳酸钠这两种成膜促进剂在CeCl3溶液中制备铈盐转化膜,通过正交试验方法获得了成膜的最佳工艺条件。利用扫描电镜分析手段对转化膜的微观形貌进行了分析,探讨了铈盐转化膜成膜机制。得到的铈盐化学转化膜具有优良的耐蚀性能。An orthogonal experiment was designed to optimize the Ce-based process in CeCl3 solution with two kinds of accelerants of sodium benzoate and sodium carbonate to replace the Cr^6＋ conversion process on Mg-Gd-Y-Zr magnesium alloy. The morphology and formation mechanism of the conversion film were studied by SEM and electrochemical experiment, the optimal process was 30 ℃ ,40 min, CeCl3 0. 005 mol/L with the sodium benzoate as accelerant, and the temperature should be 10 ℃ when the accelerant was sodium carbonate. The obtained coating has good corrosion resistance.

关 键 词：镁合金 铈盐转化膜 成膜促进剂 

分 类 号：TG178[金属学及工艺—金属表面处理]