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Effect of Sn on the Pitting Corrosion Behavior of Ultra‐Purified 17% Cr Ferritic Stainless Steel
Author(s) -
Zhang XiangJun,
Gao Fei,
Liu ZhenYu
Publication year - 2017
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201600059
Subject(s) - materials science , pitting corrosion , metallurgy , corrosion , gravimetric analysis , electrochemistry , anode , electrode , chemistry , organic chemistry
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% FeCl 3 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 SnO 2 . Dissolved Sn 2+ can inhibit elementary anodic reactions. Therefore, the content of Sn should be optimized within 0.1–0.23 wt% to obtain better corrosion resistance.