|
| Crevice Corrosion of 316L Stainless Steel in Coastal Waters of South China Sea |
| Received:September 04, 2020 Revised:September 29, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.01.015 |
| KeyWord:316L stainless steel in situ marine exposure crevice corrosion corrosion behavior microorganism, pitting |
| Author | Institution |
| LI Hui-xin |
CNOOC Research Institute Co., Ltd., Beijing , China |
| LI Da-peng |
CNOOC Research Institute Co., Ltd., Beijing , China |
| WANG Mao-mao |
Safetech Research Institute, Beijing , China |
| CHANG Wei |
CNOOC Research Institute Co., Ltd., Beijing , China |
| ZHANG Lei |
Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
| SONG Ji-wen |
CNOOC Information Technology Co., Ltd., Beijing , China |
| WANG Xiu-yun |
Safetech Research Institute, Beijing , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The aim of this study is to investigate the crevice corrosion of 316L stainless steel in coastal water of South China Sea. Crevice corrosion and pitting corrosion samples were immersed in coastal waters at the depth of about 170m in South China Sea. Optical microscope, scanning electron microscopy, energy-dispersive spectrometry and fluorescence test were carried out to characterize the corrosion products of 316L stainless steel. The results showed that 316L stainless steel is susceptible to crevice corrosion in marine environment. After the initial 120h of immersion, corrosion products and localized damage were observed on the crevice sample surface, while scratch marks were still clearly visible on the pitting sample surface. As the dissolved oxygen inside crevice depleted at the initial stage and the oxygen outside was difficult to diffuse inward, an oxygen concentration cell formed between the parts of steel insides and outside crevice, then the crevice corrosion was promoted. Because of the catalysis of Cl‒ ions and metabolism of microorganism, steel inside crevice suffered from pitting corrosion. Corrosion products accumulated and a groove formed at crevice mouth after a longer period of immersion. |
| Close |
|
|
|