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| Preparation and Corrosion Resistance of Surface Tolerant Epoxy Anti-corrosion Primer |
CHEN Xiaohan( ), BAI Yang, WANG Zhichao, CHEN Congzong, ZHANG Yong, CUI Xianlin, ZUO Juanjuan, WANG Tongliang |
| Marine Chemical Research Institute Co., Ltd., State Key Laboratory of Marine Coatings, Qingdao 266071, China |
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Abstract A surface-tolerant epoxy anticorrosive primer was prepared on the surface of Sa2 grade steel. Its solid content was up to 80%, the drying speed was only 4 h, and the average adhesion was up to 10 MPa. The coating keeps intact with no cracking and no spallation after outdoor exposure for 5 a, and has excellent corrosion resistance to acid, alkali and salt solution. The electrochemical performance and corrosion mechanism of the coating were studied by means of FTIR, EIS and three-dimensional video microscope. The results showed that the impedance of the coating reached 1010 Ω·cm2 after 2400 h seawater immersion, which showed excellent corrosion resistance. The impedance of the coating decreased first and then increased with the extension of immersion time. The densification of the coating is due to the cross-linking of epoxy resin and polyamide curing, so that can act as a good barrier to the corrosive medium. During the middle and late stage of the corrosion process, the stable complex formed by the reaction of zinc phosphate pigment with the rust on steel surface, can prevent the infiltration of corrosive medium, which may be the reason why the coating has excellent corrosion resistance and high tolerance to the substrate surface.
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Received: 07 December 2022
32134.14.1005.4537.2022.390
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| Fund: Postdoctoral Innovation Project of Shandong Province of China and Postdoctoral Applied Research Project of Qingdao of China |
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Corresponding Authors:
CHEN Xiaohan, E-mail: 2906612880@qq.com
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