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| Crevice Corrosion Behavior of 316L Stainless Steel in Deep-sea Environment |
LI Min1, HU Lingyue2, HU Kefeng2, SONG Yao1, ZHANG Zequn3, LI Zongxin3, ZHANG Bowei3( ), DONG Chaofang3, WU Junsheng3() |
1.China Huanqiu Contracting & Engineering Co., Ltd., Beijing Huanqiu Corporation, Beijing 100012, China
2.Wuhan Second Ship Design Institute, Wuhan 430064, China
3.Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China |
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Cite this article:
LI Min, HU Lingyue, HU Kefeng, SONG Yao, ZHANG Zequn, LI Zongxin, ZHANG Bowei, DONG Chaofang, WU Junsheng. Crevice Corrosion Behavior of 316L Stainless Steel in Deep-sea Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1375-1382.
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Abstract The corrosion behavior of crevice configurations composed of 316L stainless steel combined with the same steel, poly tetra fluoroethylene (PTFE) and nitrile butadiene rubber (NBR) respectively in seawater environment was investigated comprehensively by deep-sea exposure, simulation deep-sea testing and electrochemical technique. The results show that after 30 d of exposure in the deep-sea environment, in the crevice area of the couple of 316 stainless steels shows uniform corrosion thinning, but the depth of the corrosion pit is relatively shallow. However, the crevices composed of 316L stainless steel contacting with inert materials such as PTFE and NBR exhibit local corrosion mainly at the boundary of the crevice, showing a preferential trend of corrosion extending to the depth. The results of electrochemical tests show that the crevice corrosion sensitivity of different configurations is 316L-316L>316L-PTFE>316L-NBR. The deep-sea simulation test can reproduce the same corrosion phenomena as the deep-sea exposure test, but for the same test period, the crevice corrosion of samples in the real-sea environment is much more serious than that in the indoor simulation environment.
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Received: 30 November 2022
32134.14.1005.4537.2022.376
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| Fund: National Natural Science Foundation of China(51771027) |
Corresponding Authors:
ZHANG Bowei, E-mail: bwzhang@ustb.edu.cn;
WU Junsheng, E-mail: wujs@ustb.edu.cn
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