Abstract
The influence of Sn on pitting corrosion of ferritic stainless steels has been investigated by AC and DC electrochemical methods in 3.5 wt% NaCl and gravimetric tests in 6 wt% FeCl3 at 25 °C. 0.14 wt% Sn addition can improve pitting potential, while excessive addition (about 0.33 wt%) can deteriorate pitting corrosion resistance. Sn‐bearing steels have higher passive film resistance and faster growth rate of more compact passive film, in which the charge carrier density is reduced probably due to the presence of SnO2. Dissolved Sn2+ can inhibit elementary anodic reactions. Therefore, the content of Sn should be optimized within 0.1–0.23 wt% to obtain better corrosion resistance.
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