J. Mater. Sci. Technol. ›› 2021, Vol. 88: 79-89.DOI: 10.1016/j.jmst.2021.02.018

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Corrosion behavior of 13Cr stainless steel under stress and crevice in high pressure CO2/O2 environment

G.Y. Zhu, Y.Y. Li, B.S. Hou, Q.H. Zhang, G.A. Zhang*()   

  1. Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Materials Chemistry and ServiceFailure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
  • Received:2020-10-14 Revised:2021-02-03 Accepted:2021-02-23 Published:2021-03-19 Online:2021-03-19
  • Contact: G.A. Zhang
  • About author:*E-mail address: zhangguoan@gmail.com (G.A. Zhang).

Abstract:

In this work, through the self-developed setup for in situ electrochemical tests, the corrosion behavior of 13Cr stainless steel under the combined effect of stress and crevice in high pressure CO2/O2 environment was investigated. The results show that 13Cr stainless steel presents a self-passivation state. Under the action of stress, the anodic dissolution process of steel inside crevice is expedited. There is a galvanic effect between the stressed steel inside crevice and the unstressed steel outside crevice. The applied stress reduces the induction stage of crevice corrosion and induces a larger galvanic current, i.e., the applied stress promotes the development of crevice corrosion. Meanwhile, adding 0.1 MPa O2 is conducive to forming a more stable passive film but causes a greater galvanic effect.

Key words: Stainless steel, Crevice corrosion, Stress corrosion, Galvanic effect