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Corrosion Behavior of Waterborne Epoxy Ester Coatings with Different Composition in NaCl Solution
Sun, Zhendong; Zhao, Lina; Guan, Yong; Song, Qiushi; Xu, Qian; Yan, Chuanwei
2019-11-01
Source PublicationINTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
ISSN1452-3981
Volume14Issue:11Pages:10490-10507
AbstractIn this paper, the effect of water resistance, crosslinking degree, pigments addition, and immersion time on corrosion behavior of the waterborne epoxy ester coatings with different composition in 3.5 wt.% NaCl solution have been studied by electrochemical impedance spectroscopy (EIS). Results show that the coating of higher water resistance and crosslinking degree has higher corrosion resistance. However, much higher crosslinking degree may lead to decreased water resistance of the coating, and it is necessary to minimize the content of hydrophilic groups in the waterborne coating while ensuring a qualified crosslinking degree for improving its corrosion resistance. The waterborne epoxy ester varnish coating without pigments addition degrades quickly in NaCl solution compared with the coating with pigments addition of ZnMoO4 and Zn-3(PO4)(2). For the corrosion evolution of waterborne epoxy ester coating in NaCl solution, it has better shielding effect at 6 h immersion. At 72 h immersion, it still has corrosion protection effect to steel substrate; the NaCl electrolyte has penetrated into the coating but has not reached the coating/substrate interface. At 120 h immersion time, NaCl electrolyte has reached the coating/steel interface, and the steel corrosion has occurred. At 240 h immersion time, serious corrosion attack has occurred on the steel substrate, and the waterborne epoxy ester coating has lost its shielding effect and corrosion protection effect to the underlying steel substrate.
KeywordWaterborne coating Epoxy ester coating Corrosion behavior NaCl solution Shielding effect
Indexed BySCI
Language英语
WOS IDWOS:000495904600039
PublisherESG
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80660
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Sun, Zhendong,Zhao, Lina,Guan, Yong,et al. Corrosion Behavior of Waterborne Epoxy Ester Coatings with Different Composition in NaCl Solution[J]. INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,2019,14(11):10490-10507.
APA Sun, Zhendong,Zhao, Lina,Guan, Yong,Song, Qiushi,Xu, Qian,&Yan, Chuanwei.(2019).Corrosion Behavior of Waterborne Epoxy Ester Coatings with Different Composition in NaCl Solution.INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,14(11),10490-10507.
MLA Sun, Zhendong,et al."Corrosion Behavior of Waterborne Epoxy Ester Coatings with Different Composition in NaCl Solution".INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE 14.11(2019):10490-10507.
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