Effects and mechanism of Zn on the structure and corrosion resistance of microarc oxidation coatings on aluminum alloy

Yixiong Gao; Yinong Chen; Shu Xiao; Tijun Li; Hao Wu; Xinyu Meng; Wenju Li; Shuyu Fan; Zishuo Ye; Guohua Chen; Paul K. Chu

doi:10.1016/j.apsusc.2024.159909

Author(s)

Yixiong Gao
Yinong Chen
Shu Xiao
Tijun Li
Xinyu Meng
Wenju Li
Shuyu Fan
Zishuo Ye
Guohua Chen

Related Research Unit(s)

Detail(s)

Original language	English
Article number	159909
Journal / Publication	Applied Surface Science
Volume	659
Online published	15 Mar 2024
Publication status	Published - 30 Jun 2024

Link(s)

DOI	DOI https://doi.org/10.1016/j.apsusc.2024.159909 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85187959307&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(efe6aca8-0d0a-499d-bbbe-3c32d4bf3ca9).html

Abstract

A composite Zn coating is prepared on 2024 aluminum alloy by microarc oxidation (MAO) and the corrosion resistance is investigated. During MAO, the addition of an appropriate concentration of Zn²⁺ regulates the size and intensity of surface sparks on the sample giving rise to a uniform distribution of MAO current and less large discharge channels. The crystal structure of Al₂O₃ is compressed and the density of the coating increases. The coating has the Zn₃Al₉₄O₁₄₄ phase and electrochemical tests reveal a corrosion current density (i_corr) that is 3 orders of magnitude smaller than that of the coating without Zn doping. Density-functional theory calculations show that Zn inhibits the adsorption of Cl^- and consequently reduces the damage to the passivation layer. © 2024 Elsevier B.V.

Research Area(s)

Composite coating, Corrosion Resistance, Density-functional theory, Micro arc oxidation

Citation Format(s)

[ RIS ] [ BibTeX ]

Effects and mechanism of Zn on the structure and corrosion resistance of microarc oxidation coatings on aluminum alloy. / Gao, Yixiong; Chen, Yinong; Xiao, Shu et al.
In: Applied Surface Science, Vol. 659, 159909, 30.06.2024.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Gao, Y, Chen, Y, Xiao, S, Li, T, Wu, H, Meng, X, Li, W, Fan, S, Ye, Z, Chen, G & Chu, PK 2024, 'Effects and mechanism of Zn on the structure and corrosion resistance of microarc oxidation coatings on aluminum alloy', Applied Surface Science, vol. 659, 159909. https://doi.org/10.1016/j.apsusc.2024.159909

Gao, Y., Chen, Y., Xiao, S., Li, T., Wu, H., Meng, X., Li, W., Fan, S., Ye, Z., Chen, G., & Chu, P. K. (2024). Effects and mechanism of Zn on the structure and corrosion resistance of microarc oxidation coatings on aluminum alloy. Applied Surface Science, 659, Article 159909. https://doi.org/10.1016/j.apsusc.2024.159909

Gao Y, Chen Y, Xiao S, Li T, Wu H, Meng X et al. Effects and mechanism of Zn on the structure and corrosion resistance of microarc oxidation coatings on aluminum alloy. Applied Surface Science. 2024 Jun 30;659:159909. Epub 2024 Mar 15. doi: 10.1016/j.apsusc.2024.159909

Gao, Yixiong ; Chen, Yinong ; Xiao, Shu et al. / Effects and mechanism of Zn on the structure and corrosion resistance of microarc oxidation coatings on aluminum alloy. In: Applied Surface Science. 2024 ; Vol. 659.