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Preparation and properties of the anodized film on Fe-Cr-Al alloy surface

Jialin Yang (Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun, China)
Yunting Guo (Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun, China)
Wei Zai (Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun, China)
Siyuan Ma (Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun, China)
Liang Dong (Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun, China)
Guangyu Li (Jilin University, Changchun, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 19 May 2020

Issue publication date: 11 June 2020

168

Abstract

Purpose

This paper aims to find a way to improve the surface insulation, corrosion resistance and mechanical properties of Fe-Cr-Al electrothermal alloy, exploring the best oxidation condition and analyzing the oxidation mechanism.

Design/methodology/approach

Electrochemical workstation was used for anodic oxidation, and the effect of current density, ethylene glycol concentration and oxidation time on properties of the film were investigated by resistivity test, scanning electron microscope, electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy) and mechanical tests, and the oxidation process was analyzed by X-ray photoelectron spectroscopy (XPS).

Findings

According to the potential-time curves of anodic oxidation and the analysis of XPS, the whole oxidation process can be divided into four stages. When the current density is 0.8 A/dm2, the ethylene glycol concentration is 10%, and the oxidation time is 60 min, the film has the best corrosion protection, mechanical properties and surface morphology. The resistivity of the samples is about 13 orders magnitude than that of the matrix.

Originality/value

In this paper, a protective electrically insulating film was prepared by anodic oxidation in an alkaline electrolyte solution. The oxidation conditions were optimized and the oxidation mechanism was analyzed.

Keywords

Acknowledgements

This work was supported by the China National Natural Science Foundations (Grant Nos. 31070841 and 51705195).

Disclosure statement: The authors declare that they have no conflict of interest.

Citation

Yang, J., Guo, Y., Zai, W., Ma, S., Dong, L. and Li, G. (2020), "Preparation and properties of the anodized film on Fe-Cr-Al alloy surface", Anti-Corrosion Methods and Materials, Vol. 67 No. 4, pp. 379-386. https://doi.org/10.1108/ACMM-11-2019-2209

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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