Interaction of interfacial debonding and under-film corrosion propagation at the edge of the blistering area of epoxy coating

19 Pages Posted: 14 Dec 2021

See all articles by Chao Li

Chao Li

University of Science and Technology Beijing

Jin Gao

University of Science and Technology Beijing

Yunhua Huang

University of Science and Technology Beijing

Xiaogang Li

University of Science and Technology Beijing

Date Written: November 1, 2019

Abstract

The blistering of epoxy coating and its evolution were investigated after exposure to 3.5wt.% NaCl solution. The evolution of under-film corrosion could be divided into four stages, according to the observation of the corrosion morphology and the distribution of corrosion products and elements. Corrosion propagation was related to the distribution of media at the edge of the blistering area. Analysis of local electrochemical impedance spectroscopy revealed that local impedance mapping could help to predict the direction of corrosion propagation. It was proposed that the interfacial debonding at the edge of the blistering area was a necessary condition for corrosion propagation.

Keywords: Epoxy coating; LEIS; blistering; under-film corrosion; interfacial debonding

Suggested Citation

Li, Chao and Gao, Jin and Huang, Yunhua and Li, Xiaogang, Interaction of interfacial debonding and under-film corrosion propagation at the edge of the blistering area of epoxy coating (November 1, 2019). Available at SSRN: https://ssrn.com/abstract=3980261 or http://dx.doi.org/10.2139/ssrn.3980261

Chao Li

University of Science and Technology Beijing ( email )

30 Xueyuan Road, Haidian District
beijing, 100083
China

Jin Gao (Contact Author)

University of Science and Technology Beijing ( email )

30 Xueyuan Road, Haidian District
beijing, 100083
China

Yunhua Huang

University of Science and Technology Beijing ( email )

30 Xueyuan Road, Haidian District
beijing, 100083
China

Xiaogang Li

University of Science and Technology Beijing ( email )

30 Xueyuan Road, Haidian District
beijing, 100083
China

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