Coating Deterioration and Underlying Metal Corrosion Processes in Water-Line Area: Role of DACs

doi:10.3390/coatings10070684

	Coating Deterioration and Underlying Metal Corrosion Processes in Water-Line Area: Role of DACs
	Chen, Zhiwei 1,2; Zhang, Wei 1,2; Zhan, Yi 1,2; Lei, Bing 1,2; Sun, Tianying 1,2; Li, Weihua 1,2,3
	2020-07-01
发表期刊	COATINGS
卷号	10 期号:7 页码:10
通讯作者	Zhang, Wei(zhangw286@mail.sysu.edu.cn) ; Li, Weihua(liweihua3@mail.sysu.edu.cn)
摘要	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.
关键词	water-line corrosion wire beam electrode coating deterioration metal corrosion
DOI	10.3390/coatings10070684
收录类别	SCI
语种	英语
资助项目	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研究方向	Materials Science
WOS类目	Materials Science, Coatings & Films
WOS记录号	WOS:000557220600001
出版者	MDPI
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/168127
专题	海洋环境腐蚀与生物污损重点实验室
通讯作者	Zhang, Wei; Li, Weihua
作者单位	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
通讯作者单位	中国科学院海洋研究所
推荐引用方式 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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