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
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(NO3)3·6H2O 20g/L, H2O2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。
镧钝化膜
正交试验
耐蚀性
galvanized steel
lanthanum conversion film
orthogonal experiment
corrosion resistance
Abstract
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)3·6H2O 20 g/L, H2O2 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.
中图分类号 TG178
所属栏目 试验研究
基金项目 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)
收稿日期 2010/11/9
修改稿日期 2010/12/3
网络出版日期
作者单位点击查看
备注孔纲, 副研究员, 博士,
引用该论文: KONG Gang,WU Shuang,LIU Ling-yan,LU Jing-tang. Preparation Process Optimization for Lanthanum Conversion Coating on Galvanized Steel[J]. Corrosion & Protection, 2011, 32(9): 684
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参考文献
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【2】Montemor M F, Simoes A M, Ferreira M G S. Composition and corrosion behavior of galvanized steel treated with rare-earth salts:the effect of the cation[J]. Progress in Organic Coating, 2002, 44(2):111-120.
【3】Lu J T, Wu H J, Kong G, et al. Growth and corrosion behavior of rare earth film on hot dip galvanized steel[J]. Trans Nonferrous Met Soc China, 2006, 16(6):1397-1401.
【4】Ferreira M G S, Duarte R G, Montemor M F, et al. Silanes and rare earth salts as chromate replaces for pre-treatments on galvanized steel[J]. Electrochimica Acta, 2004, 49(17, 18):2927-2935.
【5】彭天兰, 满瑞林, 徐斌. 镀锌钢板表面耐腐蚀稀土镧盐转化膜的制备[J]. 涂料工业, 2008, 38(11):51-54.
【6】孔纲, 刘玲艳, 钟正, 等. 热镀锌后镧盐转化膜的制备及耐蚀性能[J]. 材料保护, 2010, 43(7):36-39.
【7】Scholes F H, Soste C, Hughes A E, et al. The role of hydrogen peroxide in the deposition of cerium-based conversion coatings[J]. Applied Surface Science, 2006, 253(4):1770-1780.
【8】Montemor M F, Simoes A M, Ferreira M G S. Composition and behaviour of cerium films on galvanised steel[J]. Progress in Organic Coatings, 2001, 43(4):274-281.
【9】孔纲, 刘仁彬, 卢锦堂, 等. 热镀锌表面镧盐转化膜生长机理的研究[J]. 金属学报, 2010, 46(4):487-493.
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