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Corrosion Behavior of 17-4 PH Stainless Steel in Simulated Seawater Containing SRB |
MA Mingwei1, ZHAO Zhihao2, JING Siwen1, YU Wenfeng1, GU Yien1, WANG Xu1( ), WU Ming2 |
1. School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China 2. College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China |
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Abstract The effect of sulfate-reducing bacteria (SRB) and applied stress on the corrosion behavior of 17-4 PH stainless steel was studied in a simulated marine solution inoculated with SRB. The stress-strain curves and fracture morphology were analyzed to acquire the differences in corrosion behavior induced by sterile solution and SRB inoculum solution respectively. The results showed that the ISCC values were increased by 5.2%, 9.3%, and 4.4% in the SRB-inoculated solution for the steels subjected to single stage aging, double stage aging and tempering treatments respectively. The corrosion product of FeS enhances the anodic dissolution process and accelerates the corrosion reaction. Double stage aging treated steels are more sensitive to SRB due to the microstructure of coarse martensite, facilitating the entry and accumulation of hydrogen. The stress corrosion cracking (SCC) mechanism for single stage aging and tempering treated steels may be ascribed to the anodic dissolution (AD), while the double-stage aging treated steel may be due to the hydrogen induced cracking (HIC).
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Received: 11 November 2019
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Fund: National Natural Science Foundation of China(51574147) |
Corresponding Authors:
WANG Xu
E-mail: wangxu@lnpu.edu.cn
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