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The influence of hexamethylenetetramine on the structure and corrosion resistance of phosphate coating on AZ31 magnesium alloy

Jiansan Li (School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China)
Yali Li (School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China)
Yanqin Chen (School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China)
Jiawei Sun (School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China)
Chunxiao Wang (School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China)
Yingcai Zheng (School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China)
Huiting Zhong (School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 3 May 2016

233

Abstract

Purpose

This paper aims to report the influence of hexamethylenetetramine (HMTA) on phosphate coatings formed on AZ31 magnesium alloys.

Design/methodology/approach

These phosphate coatings were obtained by immersing magnesium alloys in phosphate baths with HMTA. The morphology and composition of the phosphate coatings were investigated via scanning electron microscopy, energy dispersive spectrometry and X-ray diffraction.

Findings

The phosphate coatings were mainly composed of CaHPO4·2H2O. The HMTA concentration in the phosphate bath influenced the crystallization and corrosion resistance of the phosphate coating.

Originality/value

The polarization curve shows that the anti-corrosion qualities of the phosphate coating were optimal when the HMTA concentration was 1.0 g/L in the phosphate bath. Electrochemical impedance spectroscopy (EIS) shows that the electrochemical impedances increased gradually when the HMTA concentration varied from 1.0 to 3.0 g/L.

Keywords

Acknowledgements

This research was supported by the P.R.C. National Undergraduate Innovative and Entrepreneurial Training Program (Grant No. 201310561077).

Citation

Li, J., Li, Y., Chen, Y., Sun, J., Wang, C., Zheng, Y. and Zhong, H. (2016), "The influence of hexamethylenetetramine on the structure and corrosion resistance of phosphate coating on AZ31 magnesium alloy", Anti-Corrosion Methods and Materials, Vol. 63 No. 3, pp. 161-165. https://doi.org/10.1108/ACMM-11-2015-1604

Publisher

:

Emerald Group Publishing Limited

Copyright © 2016, Emerald Group Publishing Limited

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