热镀锌钢表面镧钝化膜的制备工艺优化  

Preparation Process Optimization for Lanthanum Conversion Coating on Galvanized Steel

作　　者：孔纲[1] 吴双[1] 刘玲艳[1] 卢锦堂[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640

出　　处：《腐蚀与防护》2011年第9期684-686,690,共4页Corrosion & Protection

基　　金：国际铅锌研究组织项目(ILZRO/IZA/2009023);中央高校基本科研业务费专项资金(2009ZM0072)

摘　　要：通过正交试验研究了热镀锌层镧盐转化膜的成膜影响因素,探讨了处理液成分、成膜温度和成膜时间等对热镀锌钢钝化膜的影响,确定了最佳成膜工艺参数范围:La(NO_3)_3·6H_2O 20g/L,H_2O_2浓度8～12 ml/L,处理温度65～80℃,成膜时间10～30 min,溶液pH值4.0。中性盐雾试验结果表明,采用该工艺处理镀锌钢,可以显著降低镀锌钢的腐蚀速率。The influencing factors of film formation on the corrosion resistance of lanthanum conversion film on hot dip galvanized steel were studied by the orthogonal experiment. The influences of bath composition, treatment temperature and time on the properties of conversion film were discussed. The optimum parameters gained from orthogonal tests were： La（NO3）3·6H2O20 g/L, H202 8-12 ml/L, T 65-80℃, t 10-30 min, pH 4. 0. The corrosion resistance of the lanthanum conversion film was evaluated by salt spray test. The results showed that the lanthanum conversion film was silvery gray, uniform and its corrosion rate decreased significantly compared with that of the hot dip galvanized steel.

关 键 词：镀锌钢 镧钝化膜 正交试验 耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理]