IOCAS-IR  > 海洋环境腐蚀与与生物污损重点实验室
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 PublicationCOATINGS
Volume10Issue:7Pages:10
Corresponding AuthorZhang, Wei(zhangw286@mail.sysu.edu.cn) ; Li, Weihua(liweihua3@mail.sysu.edu.cn)
AbstractWater-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.
Keywordwater-line corrosion wire beam electrode coating deterioration metal corrosion
DOI10.3390/coatings10070684
Indexed BySCI
Language英语
Funding ProjectNational 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 AreaMaterials Science
WOS SubjectMaterials Science, Coatings & Films
WOS IDWOS:000557220600001
PublisherMDPI
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://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 AuthorZhang, Wei; Li, Weihua
Affiliation1.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 AffilicationInstitute 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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