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Comparison of cathodic protection processes of 40% zinc-rich coatings under immersion and atmospheric conditions: Protection for defective areas | |
Xia, Wenting1,2; Chen, Zhiwei1,2; Zhang, Guoqing4; Zhang, Wei1,2; Liu, Fuguo4; Yao, Caiqi1,2; Lin, Zhifeng1,2; Li, Weihua1,2,3 | |
2021-07-20 | |
发表期刊 | ELECTROCHIMICA ACTA |
ISSN | 0013-4686 |
卷号 | 385页码:12 |
通讯作者 | Zhang, Wei(zhangw286@mail.sysu.edu.cn) |
摘要 | The cathodic protection of defective areas of low-content (40 wt%) zinc-rich coatings (ZRCs) was investigated under immersion and atmospheric thin liquid film conditions using a wire beam electrode (WBE). The coatings were characterised by electrochemical impedance spectroscopy, scanning electron microscopy, and surface morphology analysis. Under the two conditions, the ZRCs did not polarise the entire electrode to the protection potential interval specified by the cathodic protection standard. Due to the high dissolved oxygen content in the thin liquid film under the atmospheric condition, the zinc powder on the coating surface was rapidly activated. This resulted in a higher protection current for the steel substrate in the defect area of the coating, and metal corrosion was effectively controlled. However, corrosion in the defect area of the coating persisted under immersion although the zinc powder in the coatings also provided a protection current. In contrast to conventional sheet electrodes, WBE can provide information on surface current density distribution and associated processes such as zinc powder activation, polarisation, and polarity reversal of the substrate metal during the cathodic protection stage of ZRCs. (c) 2021 Elsevier Ltd. All rights reserved. |
关键词 | Zinc-rich coatings Cathodic protection Thin liquid films Wire beam electrode Electrochemical impedance spectroscopy |
DOI | 10.1016/j.electacta.2021.138450 |
收录类别 | SCI |
语种 | 英语 |
资助项目 | National Natural Science Foundation of China[21203034] ; National Natural Science Foundation of China[51771057] ; GF research and cultivation project of Sun Yat-sen University[7611018843406] ; National Science and Technology Resources Investigation Program of China[2019FY101400] |
WOS研究方向 | Electrochemistry |
WOS类目 | Electrochemistry |
WOS记录号 | WOS:000651778000009 |
出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.qdio.ac.cn/handle/337002/171017 |
专题 | 海洋环境腐蚀与生物污损重点实验室 |
通讯作者 | Zhang, Wei |
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 4.Offshore Oil Engn Co Ltd, Tianjin 300451, Peoples R China |
推荐引用方式 GB/T 7714 | Xia, Wenting,Chen, Zhiwei,Zhang, Guoqing,et al. Comparison of cathodic protection processes of 40% zinc-rich coatings under immersion and atmospheric conditions: Protection for defective areas[J]. ELECTROCHIMICA ACTA,2021,385:12. |
APA | Xia, Wenting.,Chen, Zhiwei.,Zhang, Guoqing.,Zhang, Wei.,Liu, Fuguo.,...&Li, Weihua.(2021).Comparison of cathodic protection processes of 40% zinc-rich coatings under immersion and atmospheric conditions: Protection for defective areas.ELECTROCHIMICA ACTA,385,12. |
MLA | Xia, Wenting,et al."Comparison of cathodic protection processes of 40% zinc-rich coatings under immersion and atmospheric conditions: Protection for defective areas".ELECTROCHIMICA ACTA 385(2021):12. |
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