2-3 Microstructure and corrosion resistance of hot dip galvanizing Zn-Ti coating
Zn-Ti coatings were prepared on steel containing 0.09％ Si by hot dip galvanizing in Zn-Ti baths. The influence of titanium on the microstructure of the coatings was investigated, and the corrosion resistance of the coatings was studied by neutral salt spray test (NSS), electrochemical polarization and X-ray photoelectron spectrum (XPS) analysis. The results show that, when the titanium content in the zinc bath increases, the growth of ζ phase in coating is restrained obviously, the thickness of coating decreases. Titanium can effectively restrain the excess growth of coating induced by reactive steel containing silicon during the hot dip galvanizing process. When the titanium content in the zinc bath is over 0.05％, the Γ2 phase particles are formed in the coating. The Zn-Ti coating shows lower corrosion current, larger polarization resistance, less spontaneous corrosion tendency in 5％ NaCl solution and better corrosion resistance than those of pure zinc coating. The oxidized film of Zn-Ti coating is composed of ZnO and TiO<,2>. The excellent corrosion resistance of Zn-Ti coating results from the reason that the present of steadier TiO<,2> film.
hot dip galvanizing Zn-Ti coating microstructure corrosion resistance
Xu Qiao-yu Gui Yan Lu Jin-tang Kong Gang Che Chun-shan
College of Materials 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
71-75
2007-09-14（万方平台首次上网日期，不代表论文的发表时间）