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Effect of micro-arc oxidation coating on stress corrosion behavior of AA7050

R.G. Song (School of Materials Science and Engineering, Changzhou University, Changzhou, China; Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, China and Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou, China)
T.S. Hua (School of Materials Science and Engineering, Changzhou University, Changzhou, China; Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, China and Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou, China)
Y. Zong (School of Materials Science and Engineering, Changzhou University, Changzhou, China; Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, China and Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou, China)
S.W. Cai (School of Materials Science and Engineering, Changzhou University, Changzhou, China; Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, China and Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 31 January 2020

Issue publication date: 11 March 2020

134

Abstract

Purpose

This paper aims to study the effect of Micro-arc oxidation (MAO) coating on stress corrosion and electrochemical behavior of aluminum alloy.

Design/methodology/approach

The stress corrosion cracking behavior of 7050 aluminum alloy (AA7050) after MAO treatment was investigated in 3.5 Wt.% NaCl solution using the constant load ring. Electrochemical impedance spectroscopy (EIS) was used to evaluate the change of corrosion resistance of MAO specimens in 3.5  Wt.% NaCl solution, and appropriate equivalent circuits were established.

Findings

The results demonstrated that the MAO coating can improve the corrosion resistance of the AA7050 and avoid the reduction of mechanical properties caused by corrosion. In the initial stage of corrosion, the corrosion resistance of coated specimen decreased at first and then increased. In the middle and final stage of corrosion, the corrosion resistance of coated specimen decreased at first and then stabilized.

Originality/value

The long-term corrosion behavior of MAO specimens under stress was studied by constant load experiment and EIS. It has guiding significance for the application of MAO technology on aluminum alloy.

Keywords

Acknowledgements

The financial aids of the National Natural Science Foundation of China under grant No. 51871031 and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) are gratefully acknowledged.

Citation

Song, R.G., Hua, T.S., Zong, Y. and Cai, S.W. (2020), "Effect of micro-arc oxidation coating on stress corrosion behavior of AA7050", Anti-Corrosion Methods and Materials, Vol. 67 No. 2, pp. 178-186. https://doi.org/10.1108/ACMM-05-2019-2120

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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