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 T i(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。
The corrosion resistance, composition and struc ture of Ti(Ⅳ) compound m odified passive films formed in low concentration of chromate solutio n 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 l o w-chromate passive film was also discussed. The experimental results show tha t the Ti(Ⅳ) ions in the passive film can effectively improve the white rust-inhibit iv e capacity of low chromate passive film, and it is caused by adulteration effec t of Ti(Ⅳ)ions and hydrolysis redeposition effect of Ti(Ⅳ)compound in the pa ssive film.
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