Corrosion resistance of tannic acid, d-limonene and nano-ZrO2 modified epoxy coatings in acid corrosion environments
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第6期
论文作者：Junwei Chang Zhenyu Wang En-hou Han Xinlei Liang Gang Wang Zuyao Yi Na Li
摘 要：The protection of rusted carbon steel in acid corrosion environments is of great significance for equipment to keep safe operation.In this work,we presented a method to protect the rusted steel by ru st conversion treatment and epoxy coating.Tannic acid was selected as rust conversion agent.Tannic acid,D-limonene and nano-ZrO2 were used to improve the corrosion resistance of epoxy coatings.The Raman spectra,Xray diffraction and 3 D confocal images were used to characterize the rust conversion reaction.Ad hesion test showed that the loss of wet adhesion of the optimal coating was relatively low due to the addition of tannic acid,limonene and nano-ZrO2.The corrosion resistance of five different coatings was investigated by scanning electron microscopy（SEM） and electrochemical analysis.Results show that after 264 h acid immersion,the low frequency resistance of the optimal coating consisting of rust conversion treatment and additives is 107 Ω cm2,three orders magnitude higher than that of the pristine coating.Moreover,SEM indicates that the optimal coating possesses a smooth surface and an unbroken interface between substrate and coating.Accordingly,the corrosion-resistant mechanism of the hybrid coating is proposed.
Junwei Chang1,2，Zhenyu Wang2，En-hou Han2，Xinlei Liang3，Gang Wang3，Zuyao Yi3，Na Li3
1. School of Materials Science and Engineering, University of Science and Technology of China2. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences3. Huadian Zhengzhou Mechanical Design Institute Co., Ltd.
摘 要：The protection of rusted carbon steel in acid corrosion environments is of great significance for equipment to keep safe operation.In this work,we presented a method to protect the rusted steel by ru st conversion treatment and epoxy coating.Tannic acid was selected as rust conversion agent.Tannic acid,D-limonene and nano-ZrO2 were used to improve the corrosion resistance of epoxy coatings.The Raman spectra,Xray diffraction and 3 D confocal images were used to characterize the rust conversion reaction.Ad hesion test showed that the loss of wet adhesion of the optimal coating was relatively low due to the addition of tannic acid,limonene and nano-ZrO2.The corrosion resistance of five different coatings was investigated by scanning electron microscopy（SEM） and electrochemical analysis.Results show that after 264 h acid immersion,the low frequency resistance of the optimal coating consisting of rust conversion treatment and additives is 107 Ω cm2,three orders magnitude higher than that of the pristine coating.Moreover,SEM indicates that the optimal coating possesses a smooth surface and an unbroken interface between substrate and coating.Accordingly,the corrosion-resistant mechanism of the hybrid coating is proposed.
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