IOCAS-IR  > 海洋环境腐蚀与与生物污损重点实验室
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
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume385Pages:12
Corresponding AuthorZhang, Wei(zhangw286@mail.sysu.edu.cn)
AbstractThe 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.
KeywordZinc-rich coatings Cathodic protection Thin liquid films Wire beam electrode Electrochemical impedance spectroscopy
DOI10.1016/j.electacta.2021.138450
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaElectrochemistry
WOS SubjectElectrochemistry
WOS IDWOS:000651778000009
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/171017
Collection海洋环境腐蚀与与生物污损重点实验室
Corresponding AuthorZhang, Wei
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
4.Offshore Oil Engn Co Ltd, Tianjin 300451, Peoples R China
Recommended Citation
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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