Electrochemical and passive behaviour of tin alloyed ferritic stainless steel in concrete environment

•Metastable pitting corrosion increased with an increase in the NaCl concentration.•Diameter of stable pits increased with an increase in the NaCl concentration.•Chemical composition of the passive film was modified by the chloride.•Chloride leads to the dehydration of the passive film in the alkali...

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Bibliographic Details
Published in:Applied surface science 2018-05, Vol.439, p.232-239
Main Authors: Luo, Hong, Su, Huaizhi, Li, Baosong, Ying, Guobing
Format: Article
Language:English
Subjects:
Ferritic stainless steel
Pitting corrosion
Sn element
XPS
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Summary:•Metastable pitting corrosion increased with an increase in the NaCl concentration.•Diameter of stable pits increased with an increase in the NaCl concentration.•Chemical composition of the passive film was modified by the chloride.•Chloride leads to the dehydration of the passive film in the alkaline environment. In the present work, the electrochemical behavior and semiconducting properties of a tin alloyed ferritic stainless steel in simulated concrete solution in presence of NaCl were estimated by conventional electrochemical methods such as potentiodynamic polarization, electrochemical impedance spectroscopy, and capacitance measurement (Mott-Schottky approach). The surface passive film was analyzed by X-ray photoelectron spectroscopy. The results revealed a good agreement between pitting corrosion, electrochemical behaviour, and electronic properties. The p and n-type bilayer structure passive film were observed. The increase of Sn4+ oxide species in the passive film shows no beneficial effects on the pitting corrosion. In addition, the dehydration of the passive film was further discussed.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2017.12.243