Effect of secondary passivation on corrosion behavior and semiconducting properties of passive film of 2205 duplex stainless steel

The effects of secondary passivation on the electrochemical behavior of passive films on the surface of 2205 duplex stainless steel were studied by potentiodynamic polarization, EIS and Mott–Schottky analysis. The composition and surface morphology of the passive film were analyzed by ICP-MS, ARXPS...

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Bibliographic Details
Published in:Journal of materials research and technology 2021-11, Vol.15, p.6828-6840
Main Authors: Yang, Guangming, Du, Yafei, Chen, Siyao, Ren, Yongsheng, Ma, Yulong
Format: Article
Language:English
Subjects:
Corrosion resistance
Duplex stainless steel
Passivation
Passive film
Semiconducting properties
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Summary:The effects of secondary passivation on the electrochemical behavior of passive films on the surface of 2205 duplex stainless steel were studied by potentiodynamic polarization, EIS and Mott–Schottky analysis. The composition and surface morphology of the passive film were analyzed by ICP-MS, ARXPS and SEM. These results manifested that the passive film formed by secondary passivation has good pitting resistance, due to the increase of the content of oxidized Fe3+, Cr3+ and Mo4+ in the passive film, which improves and increases the dissolution and migration rate of metal cations in the passive film, thus improving the compactness and stability of the passive film. The Mott–Schottky plots demonstrated that the five kinds of passive films have different semiconductor properties. The estimated doping density shows that the donor density of the passive film was significantly reduced by secondary passivation. In addition, Cl− and SO42− are permeated in the passivation layer and their adsorption on the surface of the passive film can be inhibited by the secondary passivation.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2021.11.118