3-7 Post Treatment of Silane and Cerium Salt as Chromate Replacers on Galvanized Steel
A complex film on the hot-dip galvanized steel sheets (HDG) was prepared by immersing the sheets in 0.1wt％ Ce(NO<,3>)<,3> solution and 5vol.％ silane solution in turn. The corrosion protection of the complex film was evaluated by potentiodynamic linear polarization (LPR), electrochemical impendence spectra (EIS) and nature salt spray (NSS) tests and compared with that of single cerium film and silane film. The results show that, the presence of these films on the zinc coating hinders the corrosion reaction by reducing the rate of both the anodic and the cathodic reaction in the corrosion process, and the corrosion protection of the complex film is much better than that of the single cerium film or silane film and closed to that of chromate film, because the polarization resistance RD and the electrochemical impendence are increased markedly.The microstructure and chemical composition of these pretreated films was also investigated by SEM and AES.
Hot-dip galvanized coating Cerium salt film Silane film non-chromate pasivation
Lu Jin-tang Kong Gang Wu Hai-jiang Chen Jin-hong Che Chunshan
School of Material Science and Engineering, South China University of Technology, Guangzhou 510640, China
国际会议
第七届亚太镀锌大会(The 7th Asia Pacific General Galvanizing Conference)(7th APGGC)
北京
英文
173-177
2007-09-14（万方平台首次上网日期，不代表论文的发表时间）