Corrosion resistance of 316L stainless steel in acetic acid by EIS and Mott-Schottky

Abstract

The properties of the passivation film formed on 316L stainless steel were studied by Electrochemical Impedance Spectroscopy (EIS), Mott-Schottky and Voltammetry measurements in high-temperature acetic acid. The results show that the passivation film formed on 316L stainless steel is stable in 60% acetic acid solution from 25 °C to 85 °C. As temperature increased, the polarization resistance decreased but the interface capacitance increased. There was hardly any relation between temperature and the intrinsic property semiconductor. The passivation film represents the p-semiconductor property in the potential interval of −0.5–0.1 V; represents the n-semiconductor property in the potential interval of 0.1–0.9 V; and represents the p-semiconductor property in the potential interval of 0.9–1.1 V. The voltammetry measurements show that the structure of the passivation film is stable when the temperature is lower than 55 °C and that its stability decreased when this temperature is exceeded.

Keywords

stainless steel / passivation film / Mott-Schottky / acetic acid

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