Passivation behavior and surface chemistry of Fe-based amorphous coating in NaCl solution: Influence of applied potential and immersion time.

The influence of the potential for film formation and immersion time on the corrosion resistance of the passive film formed on Fe-based amorphous coating was thoroughly investigated. The semiconducting properties and chemical composition of the passive films were analyzed employing Mott-Schottky and XPS techniques. Results indicate that the stability of the film diminished as the potentials and immersion periods increased. The structural properties and chemical composition of film played a crucial role in the corrosion resistance of the coating in a chloride electrolyte. The accumulation of cation vacancies and the formation of metal chlorides increased the likelihood of film rupture, ultimately leading to pitting. • Reveal the effect external environmental conditions on the characteristics of the passive film. • The corrosion resistance of passive film is independent of the thickness. • Reveal the effect of passive film structure and composition on the coating's corrosion resistance. • The formation of a cation vacancy condensate and solid metal chloride lead to failure of the passive film. [ABSTRACT FROM AUTHOR]