Evidence of hydrogen gas evolution accelerating the cathodic coating delamination
For coated pipelines with cathodic protection, cathodic delamination has been recognized as one of the main causes of coating degradation. A thorough understanding of the cathodic delamination mechanism would benefit to pipeline integrity. The mechanism of local alkalization has been taken root in r...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Corrosion Communications |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667266922000366 |
| _version_ | 1811317123838902272 |
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| author | Chenrong Gu Junying Hu Xiankang Zhong |
| author_facet | Chenrong Gu Junying Hu Xiankang Zhong |
| author_sort | Chenrong Gu |
| collection | DOAJ |
| description | For coated pipelines with cathodic protection, cathodic delamination has been recognized as one of the main causes of coating degradation. A thorough understanding of the cathodic delamination mechanism would benefit to pipeline integrity. The mechanism of local alkalization has been taken root in recent years, while the contribution of hydrogen gas evolution is still controversial. In this work, the mixed-potential theory was introduced to calculate the test time ratio of cathodic delamination, with or without hydrogen gas. The wire-beam electrode was also used to monitor the local electrochemical information. The results show that the hydrogen gas remarkably promotes the delamination process. For 100 μm single layer epoxy coating, when the applied cathodic potential was −1.5 V (vs. SCE), the contribution of hydrogen gas is around 38.7%. The findings will help build a full understanding of cathodic delamination and provide new insight into its mitigation. |
| first_indexed | 2024-04-13T12:01:35Z |
| format | Article |
| id | doaj.art-4d62450f2c924c4c8b7e9f310f3d3acf |
| institution | Directory Open Access Journal |
| issn | 2667-2669 |
| language | English |
| last_indexed | 2024-04-13T12:01:35Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Corrosion Communications |
| spelling | doaj.art-4d62450f2c924c4c8b7e9f310f3d3acf2022-12-22T02:47:46ZengElsevierCorrosion Communications2667-26692022-09-0176369Evidence of hydrogen gas evolution accelerating the cathodic coating delaminationChenrong Gu0Junying Hu1Xiankang Zhong2State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaCorresponding author.; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaFor coated pipelines with cathodic protection, cathodic delamination has been recognized as one of the main causes of coating degradation. A thorough understanding of the cathodic delamination mechanism would benefit to pipeline integrity. The mechanism of local alkalization has been taken root in recent years, while the contribution of hydrogen gas evolution is still controversial. In this work, the mixed-potential theory was introduced to calculate the test time ratio of cathodic delamination, with or without hydrogen gas. The wire-beam electrode was also used to monitor the local electrochemical information. The results show that the hydrogen gas remarkably promotes the delamination process. For 100 μm single layer epoxy coating, when the applied cathodic potential was −1.5 V (vs. SCE), the contribution of hydrogen gas is around 38.7%. The findings will help build a full understanding of cathodic delamination and provide new insight into its mitigation.http://www.sciencedirect.com/science/article/pii/S2667266922000366Coating delaminationHydrogen gas evolutionCathodic protectionWire-beam electrodes |
| spellingShingle | Chenrong Gu Junying Hu Xiankang Zhong Evidence of hydrogen gas evolution accelerating the cathodic coating delamination Corrosion Communications Coating delamination Hydrogen gas evolution Cathodic protection Wire-beam electrodes |
| title | Evidence of hydrogen gas evolution accelerating the cathodic coating delamination |
| title_full | Evidence of hydrogen gas evolution accelerating the cathodic coating delamination |
| title_fullStr | Evidence of hydrogen gas evolution accelerating the cathodic coating delamination |
| title_full_unstemmed | Evidence of hydrogen gas evolution accelerating the cathodic coating delamination |
| title_short | Evidence of hydrogen gas evolution accelerating the cathodic coating delamination |
| title_sort | evidence of hydrogen gas evolution accelerating the cathodic coating delamination |
| topic | Coating delamination Hydrogen gas evolution Cathodic protection Wire-beam electrodes |
| url | http://www.sciencedirect.com/science/article/pii/S2667266922000366 |
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