The mechanism of inhibition by zinc phosphate in an epoxy coating |
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| Affiliation: | 1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, Shenyang 110016, China;2. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China;1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran;2. Department of Mining and Material Engineering, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran;1. Department of Surface Coatings and Corrosion, Institute for Color Science and Technology (ICST), PO 16765-654 Tehran, Iran;2. Institute for Color Science and Technology (ICST), PO 16765-654 Tehran, Iran;3. Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Iran;1. Department of Materials, Faculty of Science and Engineering, Swansea University, Bay Campus, Fabian Way, Crymlyn Burrow, Swansea SA1 8EN, UK;2. Tata Steel UK Limited, DE Shotton Works, Deeside CH5 2NH, UK;1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China;2. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, China |
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| Abstract: | Epoxy coatings containing different volume fractions of zinc phosphate have been successfully prepared and their inhibitive properties have been studied by electrochemical impedance spectroscopy (EIS) and immersion tests. The results show that zinc phosphate can improve the protection ability of epoxy coatings and its best volume fraction is 30%. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) results indicate that the presence of zinc phosphate can form an inhibiting film which is composed of the phosphating film of FePO4, Fe2O3, and FeO, as well as the shielding film of zinc phosphate on the steel surface. |
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