2001•The Chinese Journal of Nonferrous MetalsRequires access

Low-chromate passive film modified with Ti(IV) ions

Yan Lü

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. [

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Key concepts: Chromate conversion coating, Materials science, Ion, X-ray photoelectron spectroscopy, Corrosion, Polarization (electrochemistry), Salt spray test, Salt (chemistry)