成膜时间对镁合金铈盐转化膜的影响  

Effect of Conversion Time on Cerium Salt Conversion Coatings on the Surface of Magnesium Alloy

作　　者：郭毅[1] 鲁彦玲[1] 杜仕国[1] 陈言坤[1] 

机构地区：[1]军械工程学院三系,河北石家庄050003

出　　处：《材料保护》2010年第10期30-32,共3页Materials Protection

基　　金：军械工程学院科学研究基金(YJJXM09028)资助

摘　　要：以往鲜见成膜时间对稀土转化膜影响的系统研究。以优化后的转化工艺0.02 mol/L铈盐,5 mL/LH2O2,温度30℃,pH=2,在镁合金表面制得稀土转化膜,通过对不同转化时间制得的膜进行表面形貌分析、能谱分析、浸泡腐蚀试验和电化学试验,考察膜的形成过程及耐腐蚀性能。结果表明:随转化时间的延长,耐蚀性呈现增强的趋势;转化膜是在2种不同推动力下形成的双层膜结构,双层膜的耐腐蚀能力也不同;减少裂纹和修补裂纹是提高膜耐腐蚀能力的必要措施。The formation process and corrosion resistance of the rare earth conversion coatings were investigated by analyzing coatings obtained at different conversion time via scanning electron microscopy,energy dispersive spectrometry,immersion corrosion test and electrochemical test.Results show that the corrosion resistance of the rare earth conversion coatings tends to increase with extending conversion time.The conversion coatings had a double-layer structure,and their corrosion resistance varied with depth.Besides,it was feasible to effectively improve the corrosion resistance of the conversion coatings by decreasing the amount of cracks and by repairing the cracks as well.

关 键 词：镁合金 转化膜 硝酸铈 成膜时间 形成过程 耐腐蚀性能 

分 类 号：TG174.45[金属学及工艺—金属表面处理]