Institutional Repository of Key Laboratory of Marine Environmental Corrosion and Bio-fouling, IOCAS
| Coating Deterioration and Underlying Metal Corrosion Processes in Water-Line Area: Role of DACs | |
| Chen, Zhiwei1,2; Zhang, Wei1,2; Zhan, Yi1,2; Lei, Bing1,2; Sun, Tianying1,2; Li, Weihua1,2,3 | |
| 2020-07-01 | |
| Source Publication | COATINGS
 |
| Volume | 10Issue:7Pages:10 |
| Corresponding Author | Zhang, Wei(zhangw286@mail.sysu.edu.cn) ; Li, Weihua(liweihua3@mail.sysu.edu.cn) |
| Abstract | Water-line corrosion is a highly concentrated type of localized corrosion. The conventional single electrode method is limited in its ability to obtain the kinetic information of the corrosion occurrence and development processes. Herein, the coating deterioration and underlying metal corrosion processes in water-line area were studied by a small wire beam electrode to monitor the current density distribution. The distance between each electrode was very small (interval: 0.3 mm), thus facilitating it to approach the practical metal component with a continuous surface. The results showed that cathodic and anodic sites tended to be weak points of the coating at the initial stage. With the continuous degradation of the coating, the cathodic zone tended to occur in the above the anodic zone due to the effect of differential aeration cells (DACs). Subsequently, the cathodic zone expanded to the waterline and the polarity reversed to the anodic zone, causing the coating to peel and blister continuously from the bottom up. When the cathodic zone extended to the gas phase area above the water line, this area became the strongest cathodic zone under the action of the thin liquid film, thus significantly accelerating the corrosion of the base metal at the bottom. The present study aims to achieve an in-depth understanding of coating deterioration and underlying metal corrosion processes in the water-line area, providing a new means of directly visualizing the role of DACs played in water line corrosion. |
| Keyword | water-line corrosion wire beam electrode coating deterioration metal corrosion |
| DOI | 10.3390/coatings10070684 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51525903] ; National Natural Science Foundation of China[51879292] ; National Natural Science Foundation of China[21203034] ; National Natural Science Foundation of China[51771057] ; GF research and cultivation project of Sun Yat-sen University[76110-18843406] |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Coatings & Films |
| WOS ID | WOS:000557220600001 |
| Publisher | MDPI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/168127 |
| Collection | 海洋环境腐蚀与与生物污损重点实验室 |
| Corresponding Author | Zhang, Wei; Li, Weihua |
| Affiliation | 1.Sun Yat Sen Univ, Sch Chem Engn & Technol, Zhuhai 519082, Peoples R China 2.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, Qingdao 266071, Peoples R China |
| Corresponding Author Affilication | Institute of Oceanology, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Chen, Zhiwei,Zhang, Wei,Zhan, Yi,et al. Coating Deterioration and Underlying Metal Corrosion Processes in Water-Line Area: Role of DACs[J]. COATINGS,2020,10(7):10. |
| APA | Chen, Zhiwei,Zhang, Wei,Zhan, Yi,Lei, Bing,Sun, Tianying,&Li, Weihua.(2020).Coating Deterioration and Underlying Metal Corrosion Processes in Water-Line Area: Role of DACs.COATINGS,10(7),10. |
| MLA | Chen, Zhiwei,et al."Coating Deterioration and Underlying Metal Corrosion Processes in Water-Line Area: Role of DACs".COATINGS 10.7(2020):10. |
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