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Journal of Coatings Technology and Research

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17-11-2020

Comparative study on the degradation of a zinc-rich epoxy primer/acrylic polyurethane coating in different simulated atmospheric solutions

Authors: Wei Sun, Chao Xing, Xiaobo Tang, Yu Zuo, Yuming Tang, Xuhui Zhao

Published in: Journal of Coatings Technology and Research | Issue 2/2021

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Abstract

The degradation of a zinc-rich epoxy primer/acrylic polyurethane coating system on carbon steel was studied in the simulated marine atmospheric solution (0.05% NaCl), industrial atmospheric solution (0.35% (NH₄)₂SO₄), and marine-industrial atmospheric solution (0.05% NaCl + 0.35% (NH₄)₂SO₄), by electrochemical impedance spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy methods. The influences of the soluble contaminants in the atmospheres, including chloride ions, sulfate ions, and ammonium ions, on the coating failure mechanism were compared and analyzed. The results showed that the degradation speed of the coating system in three simulated atmospheric solutions is in the following order: simulated marine atmosphere > simulated marine-industrial atmosphere > simulated industrial atmosphere. The degradation is mainly related to the permeation rate of the water through the coating. The aggressive ions, basic cations, and the property of the corrosion products also have influences on the degradation process. The alternating temperature environment (45°C 12 h + 25°C 12 h) could increase the degradation speed of the coating and the difference of the speed in the three solutions.

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Title: Comparative study on the degradation of a zinc-rich epoxy primer/acrylic polyurethane coating in different simulated atmospheric solutions
Authors: Wei Sun
Chao Xing
Xiaobo Tang
Yu Zuo
Yuming Tang
Xuhui Zhao
Publication date: 17-11-2020
Publisher: Springer US
Published in: Journal of Coatings Technology and Research / Issue 2/2021
Print ISSN: 1547-0091
Electronic ISSN: 1935-3804
DOI: https://doi.org/10.1007/s11998-020-00410-8

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