(北京科技大学 表面科学与腐蚀工程系，北京 100083)
摘 要: 通过采用极化阻力测量、中性盐雾试验和SEM，XRD，XPS等手段研究了含Ti(Ⅳ)低铬钝化膜的耐蚀性、组成与结构，探讨了钛离子对钝化膜防护机理的影响。结果表明，膜内Ti(Ⅳ)离子可以有效地提高镀锌低铬钝化膜的抗白锈能力，这是由于膜内Ti(Ⅳ)离子的掺杂效应和Ti(Ⅳ)化合物水解再沉积作用所致。
关键字: Ti(Ⅳ)化合物； 铬酸盐； 耐蚀性； 转化膜
（Department of Corrosion Engineering, University of Science and Technology Beijing,
Beijing 100083, P.R.China）
Abstract:The corrosion resistance, composition and structure of Ti(Ⅳ) compound modified passive films formed in low concentration of chromate solution were studied by means of polarization resistance measuring, neutral salt spray test and SEM, XRD, XPS, and the effect of Ti(Ⅳ) ion on the protective mechanism of low-chromate passive film was also discussed. The experimental results show that the Ti(Ⅳ) ions in the passive film can effectively improve the white rust-inhibitive capacity of low chromate passive film, and it is caused by adulteration effect of Ti(Ⅳ)ions and hydrolysis redeposition effect of Ti(Ⅳ)compound in the passive film.
Key words: Ti(Ⅳ) compound； chromate; corrosion resistance; conversion coating
