A zinc-doped coating prepared on the magnesium alloy by plasma electrolytic oxidation for corrosion protection

Chao Yang; Hu Cai; Suihan Cui; Jian Huang; Jiayu Zhu; Zhongcan Wu; Zhengyong Ma; Ricky K.Y. Fu; Liyuan Sheng; Xiubo Tian; Paul K. Chu; Zhongzhen Wu

doi:10.1016/j.surfcoat.2022.128148

Author(s)

Chao Yang
Hu Cai
Suihan Cui
Jian Huang
Jiayu Zhu
Zhongcan Wu
Zhengyong Ma
Ricky K.Y. Fu
Liyuan Sheng
Xiubo Tian
Zhongzhen Wu

Related Research Unit(s)

Detail(s)

Original language	English
Article number	128148
Journal / Publication	Surface and Coatings Technology
Volume	433
Online published	24 Jan 2022
Publication status	Published - 15 Mar 2022

Link(s)

DOI	DOI https://doi.org/10.1016/j.surfcoat.2022.128148 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85123683069&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(f1412583-d4c9-4537-b7f7-c199f8bf7c87).html

Abstract

Corrosion protection of magnesium alloys is a challenge in industrial applications because of the high chemical reactivity of Mg. In this work, a coating is prepared by plasma electrolytic oxidation (PEO) on the AZ31B Mg alloy and then modified by insoluble zinc phosphate to improve the corrosion resistance. To avoid the influence of the weak acidic Zn-containing electrolyte on the formation of the passivation layer on the magnesium alloy, a two-step process is designed to first produce a passivation layer before introduction of zinc phosphate. Zinc phosphate is mainly distributed on the surface and the sidewalls of the holes in the porous coating and blocks the interactions between the corrosive solution and Mg substrate. The corrosion potential of the optimal coating (Zn-15) increase while the passive current density at the terminal potential decreases, suggesting the significantly improved corrosion resistance compared to the pristine AZ31B. The life time demonstrated by neutral salt spraying is 4200 h that is about 3 times longer than that observed from the Mg alloy with the undoped coating.

Research Area(s)

Corrosion resistance, Magnesium alloy, Plasma electrolytic oxidation (PEO), Zinc phosphate

Citation Format(s)

[ RIS ] [ BibTeX ]

A zinc-doped coating prepared on the magnesium alloy by plasma electrolytic oxidation for corrosion protection. / Yang, Chao; Cai, Hu; Cui, Suihan; Huang, Jian; Zhu, Jiayu; Wu, Zhongcan; Ma, Zhengyong; Fu, Ricky K.Y.; Sheng, Liyuan; Tian, Xiubo; Chu, Paul K.; Wu, Zhongzhen.

In: Surface and Coatings Technology, Vol. 433, 128148, 15.03.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review

Yang, C, Cai, H, Cui, S, Huang, J, Zhu, J, Wu, Z, Ma, Z, Fu, RKY, Sheng, L, Tian, X, Chu, PK & Wu, Z 2022, 'A zinc-doped coating prepared on the magnesium alloy by plasma electrolytic oxidation for corrosion protection', Surface and Coatings Technology, vol. 433, 128148. https://doi.org/10.1016/j.surfcoat.2022.128148

Yang, C., Cai, H., Cui, S., Huang, J., Zhu, J., Wu, Z., Ma, Z., Fu, R. K. Y., Sheng, L., Tian, X., Chu, P. K., & Wu, Z. (2022). A zinc-doped coating prepared on the magnesium alloy by plasma electrolytic oxidation for corrosion protection. Surface and Coatings Technology, 433, [128148]. https://doi.org/10.1016/j.surfcoat.2022.128148

Yang C, Cai H, Cui S, Huang J, Zhu J, Wu Z et al. A zinc-doped coating prepared on the magnesium alloy by plasma electrolytic oxidation for corrosion protection. Surface and Coatings Technology. 2022 Mar 15;433. 128148. https://doi.org/10.1016/j.surfcoat.2022.128148

Yang, Chao ; Cai, Hu ; Cui, Suihan ; Huang, Jian ; Zhu, Jiayu ; Wu, Zhongcan ; Ma, Zhengyong ; Fu, Ricky K.Y. ; Sheng, Liyuan ; Tian, Xiubo ; Chu, Paul K. ; Wu, Zhongzhen. / A zinc-doped coating prepared on the magnesium alloy by plasma electrolytic oxidation for corrosion protection. In: Surface and Coatings Technology. 2022 ; Vol. 433.