Corrosion-resistant plasma electrolytic oxidation coating modified by Zinc phosphate and self-healing mechanism in the salt-spray environment

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

2 Scopus Citations
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Author(s)

  • Qian Huang
  • Zhongzhen Wu
  • Shunping Ji
  • Pinghu Chen
  • Zhengyong Ma
  • Zhongcan Wu
  • Ricky K.Y. Fu
  • Hai Lin
  • Xiubo Tian
  • Feng Pan

Detail(s)

Original languageEnglish
Article number125321
Journal / PublicationSurface and Coatings Technology
Volume384
Online published7 Jan 2020
Publication statusPublished - 25 Feb 2020

Abstract

Aluminum alloys are widely used in many industrial applications. However, they are susceptible to corrosion especially in aggressive media such as high salinity which can expedite the corrosion reactions. In this work, zinc phosphate modified plasma electrolytic oxidation (PEO) coatings are fabricated and demonstrated to have excellent corrosion resistance for a much longer duration (> 11,000 h) than conventional PEO coatings (< 1,000 h). Insoluble zinc phosphate is distributed in the pores of the coating serving as a barrier against the high-salinity medium. A self-healing mechanism is discovered as zinc phosphate migrates from the surface to pores continuously wetting the corrosion droplets on the super-hydrophilic coating until all the zinc phosphate is consumed.

Research Area(s)

  • Aluminum, Corrosion, PEO, Self-healing, Zinc phosphate

Citation Format(s)

Corrosion-resistant plasma electrolytic oxidation coating modified by Zinc phosphate and self-healing mechanism in the salt-spray environment. / Huang, Qian; Liu, Liangliang; Wu, Zhongzhen; Ji, Shunping; Wu, Hao; Chen, Pinghu; Ma, Zhengyong; Wu, Zhongcan; Fu, Ricky K.Y.; Lin, Hai; Tian, Xiubo; Pan, Feng; Chu, Paul K.

In: Surface and Coatings Technology, Vol. 384, 125321, 25.02.2020.

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