影响热镀锌板三价铬钝化膜质量的因素及改进措施  

Factors affecting the quality of trivalent chromium passivation coating on hot-dip galvanized steel sheet and improvement measures

作　　者：张亮亮[1,2] 李研[1,2] 于洋[1,2] 高小丽[1,2] 张秋生 鲍成人 

机构地区：[1]首钢技术研究院,北京100043 [2]绿色可循环钢铁流程北京市重点实验室,北京100043 [3]首钢京唐公司冷轧厂,河北唐山063200

出　　处：《电镀与涂饰》2016年第16期858-862,885,共5页Electroplating & Finishing

摘　　要：针对某冷轧厂生产的三价铬钝化热镀锌板耐蚀性差的问题,从微观特征与钝化工艺方面对钝化膜质量进行研究。发现钝化膜质量与膜中Cr化合物的含量正相关,致密性越好则耐蚀性越好,而且钝化膜厚度及其均匀性与带钢运行速率、基板厚度、钝化涂覆辊辊间压力等参数有密切关系。从钝化液浓度、基板粗糙度、涂覆辊辊间压力、钝化辊辊面质量等方面对钝化工艺进行优化,钝化膜质量得到明显改善,72 h中性盐雾试验合格率达到95%以上。The quality of trivalent chromium passivation coatings were studied from the aspects of microscopic characteristics and passivation process to solve the problem of poor corrosion resistance of the hot-dip galvanized steel sheets produced in a cold rolling plant. It was found that the quality of passivation coating is positively correlated with the content of Cr compounds in the coating. The better the compactness ofpassivation coating is, the high its corrosion resistance is. The coating thickness and its uniformity are closely related with the running rate and thickness of steel strip, the pressure of passivation coating roller and so on. The passivation process parameters including passivation bath composition, the roughness of steel strip, the stress of passivation coating roller and the quality of passivation coating roller surface were optimized. The quality of passivation coatings are improved obviously after optimization. The pass rate is higher than 95% in 72-hour neutral salt spray test.

关 键 词：钢 热浸镀锌 三价铬钝化膜 耐蚀性 中性盐雾试验 微观结构 工艺优化 

分 类 号：TG174.443[金属学及工艺—金属表面处理] TG178[金属学及工艺—金属学]