Corrosion behavior of ZnO-reinforced coating on aluminum alloy prepared by plasma electrolytic oxidation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

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

Detail(s)

Original languageEnglish
Pages (from-to)1015-1023
Journal / PublicationSurface and Coatings Technology
Volume374
Early online date28 Jun 2019
Publication statusPublished - 25 Sep 2019

Abstract

Aluminum alloys are widely used in the aerospace and transportation industries, but the corrosion resistance is insufficient in long-term service especially in the high salinity environment. A ceramic coating composed of ZnO nanoparticles is demonstrated to significantly improve the corrosion resistance of the Al alloys. Owing to the similar chemical activity of Zn and Al, ZnO particles fuse into Al2O3 in the micro-arc during plasma electrolytic oxidation (PEO) rendering the coating compactness. The formation mechanism of the PEO coating is investigated and discussed. The corrosion current of the ZnO modified PEO coating is 4 orders of magnitude less than that of the LY12 substrate. Immersion tests performed in 3.5 wt% sodium chloride show that incorporation of ZnO prevents destruction and dissolution of the PEO coating in the high salinity environment.

Research Area(s)

  • Al alloys, Corrosion resistance, Plasma electrolytic oxidation, Zinc oxide

Citation Format(s)

Corrosion behavior of ZnO-reinforced coating on aluminum alloy prepared by plasma electrolytic oxidation. / Huang, Qian; Wu, Zhongzhen; Wu, Hao; Ji, Shunping; Ma, Zhengyong; Wu, Zhongcan; Chen, Pinghu; Zhu, J.; Fu, Ricky K.Y.; Lin, Hai; Tian, X.; Pan, Feng; Chu, Paul K.

In: Surface and Coatings Technology, Vol. 374, 25.09.2019, p. 1015-1023.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review