摘要
为探究单宁酸对热镀Zn-Al-Ce层表面磷钼复合转化膜耐蚀性的影响,以不同单宁酸浓度的磷钼复合转化液对热镀Zn-Al-Ce镀层进行转化处理,采用硫酸铜点滴试验、NSS试验、NaCl溶液浸泡试验、极化曲线等研究了单宁酸浓度对复合转化膜耐蚀性的影响,并用SEM分析了复合转化膜的结构。结果表明:当单宁酸浓度6 g/L、钼酸钠浓度15 g/L、p H值为2时所形成转化膜的耐蚀性能最好,膜层最致密。
Hot-dipped Zn-Al-Ce coating was converted by phosphate-molybdate complex conversion solution with different tannic acid concentrations,and the effects of tannic acid concentrations on corrosion resistance of composite conversion films were studied by copper sulfate drips,NSS tests,salt water immersion tests and polarization curves,then the structure of composite conversion film was analyzed by SEM.Results showed that the conversion film had the best corrosion resistance and was the densest when the concentrations of tannic acid and sodium molybdate were 6,15 g/L and the pH value was 2.
作者
王立
刘志宏
杨珂
屈中伟
赵定义
WANG Li;LIU Zhi-hong;YANG Ke;QU Zhong-wei;ZHAO Ding-yi(Power Grid Planning and Research Center of Guizhou Power Grid Co.,Ltd.,Guiyang 550000,China;Wuhan Tengyao New Materials Engineering Co.,Ltd.,Wuhan 430000,China)
出处
《材料保护》
CAS
CSCD
北大核心
2020年第3期117-119,125,共4页
Materials Protection
基金
贵州电网有限责任公司科技项目“纳米稀土修饰多元热镀锌合金材料在输电杆塔上的研究与应用”资助。
关键词
热镀锌
单宁酸
复合转化膜
稀土
耐蚀性
hot galvanizing
tannic acid
composite conversion film
rare earth
corrosion resistance
