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| Localized Corrosion Law of 316L Stainless Steel in Deep Seawater |
| Received:July 25, 2018 Revised:January 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.01.020 |
| KeyWord:316L stainless steel deep-sea water marine microorganism pitting corrosion |
| Author | Institution |
| LIU Dian-yu |
1. Baiyun Natural Gas Operations of CCLS, Shenzhen , China |
| WANG Mao-mao |
2. Anko Engineering Technology Institute Limited Company, Beijing , China |
| ZHANG Liang |
3. CNOOC Information Technology Co., Ltd. Beijing Branch, Beijing , China |
| LI Da-peng |
1. Baiyun Natural Gas Operations of CCLS, Shenzhen , China |
| CHANG Wei |
4. CNOOC Research Institute Ltd., Beijing , China |
| WANG Xiu-yun |
2. Anko Engineering Technology Institute Limited Company, Beijing , China |
| WANG Run |
3. CNOOC Information Technology Co., Ltd. Beijing Branch, Beijing , China |
| ZHANG Lei |
5. University of Science and Technology Beijing Institute for Advanced Materials and Technology, Beijing , China |
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| Abstract: |
| Objective To study the localized corrosion law of 316L stainless steel in deep-sea water. Methods The experiment was carried out to study the corrosion law of 316L stainless steel with the self-developing experimental provision in 170m water depth, together with cyclic polarization curves, SEM and EDS. Results Pitting corrosion occurred for 316L stainless steel after 7 days of immersion. But protective microbial film would form for adsorption of microorganism. It would lead to self-corrosion and positive shift of breakdown potential. The pitting resistance might increase. As the immersing time increased, the content of oxygen dissolved decreased, the property of microbial film on the sample surface changed. The passive film broke under the action of microorganism and Cl-. The self-corrosion and breakdown potential shifted negatively. The pitting corrosion resistance decreased. Conclusion The corrosion resistance of 316L stainless steel decreased and then increased with the increase of immersion. |
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