摘要
制备了热浸锌层钛盐转化膜,采用SEM、EDS表征了转化膜的表面形貌、化学成分,采用XPS技术分析了膜层的组成,探讨了膜层的生长过程。通过中性盐雾试验、电化学极化分析和电化学阻抗研究了膜层的耐蚀性能。结果表明,膜层主要由含结晶水的Ti(OH)4/TiO2和Zn(OH)2/ZnO组成,随着处理时间的增加钛盐转化膜逐渐增厚,膜层中的Ti含量逐渐增加。与未经处理的热浸镀锌层比较,转化膜层腐蚀电流密度减小,极化电阻和电化学阻抗显著增大,耐蚀性明显增强。
A Ti containing conversion film on hot-dip galvanized steel was prepared by chemical conversion in titanium sulfate solution. The surface morphology, chemical composition and ingredients of the film were characterized by means of SEM, EDS and XPS. Then the corrosion resistance of the galvanized steel coated with Ti containing conversion film was examined by NSS test, electrochemical polarization and electrochemical impedance spectroscopy(EIS). The results show that the Ti containing conversion film gradually thickens and the Ti content of the film increases with the increasing time in the solution; the film mainly consists of Ti(OH)4/TiO2and Zn(OH)2/ZnO. In comparison with the blank galvanized steel, the corrosion current density decreases, the polarization resistance and the electrochemical impedance increase significantly for the galvanized steel with Ti containing conversion film on top. The Ti containing conversion films enhance the corrosion resistance significantly, among them a film prepared in the solution for 10 min exhibits the highest corrosion resistance.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2014年第7期521-527,共7页
Chinese Journal of Materials Research
基金
广东省教育部产学研结合项目2012B091100312
中央高校基本科研业务费专项资金2012ZM0011资助~~
关键词
材料失效与保护
热浸镀锌
转化膜
钛盐
耐蚀性能
materials failure and protection,hot-dip galvanizing,conversion film,titanium,corrosion resistance
