Titania-zinc phosphate/nanocrystalline zinc composite coatings for corrosion protection of biomedical WE43 magnesium alloy

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

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  • Jingyao Li
  • Jian Li
  • Qingyang Li
  • Haili Zhou
  • Weihong Jin
  • Zhentao Yu
  • Wei Li


Original languageEnglish
Article number126940
Journal / PublicationSurface and Coatings Technology
Online published4 Feb 2021
Publication statusPublished - 25 Mar 2021


Biodegradable medical implants made of magnesium (Mg) alloys must have sufficient corrosion resistance in clinical applications. Herein, a nanocrystalline zinc (Zn) coating is electrodeposited on the WE43 Mg alloy followed by a chemical conversion treatment to produce a titania-Zn phosphate layer. The Zn coating has a rice-like nanostructure and the conversion layer is composed of ZnO, Zn3(PO4)2, and TiO2. The Zn coating reduces the corrosion current density of the WE43 Mg alloy from 151.1 ± 13.8 μA cm−2 to 29.4 ± 7.4 μA cm−2 in the simulated body fluid (SBF), while the composite coating decreases it to 4.1 ± 0.8 μA cm−2. The surface morphology, pH variation, and average corrosion rates after immersion for 7 days in SBF reveal that the Zn coating in fact accelerates dissolution of the Mg substrate due to the formation of galvanic couples between the Zn coating and Mg alloy substrate. In comparison, only slight corrosion is observed from limited areas on the sample with the composite coating. The titania-Zn phosphate/nanocrystalline Zn composite coating provides long-term protection in the physiological environment and the protection mechanism is discussed.

Research Area(s)

  • Biodegradable magnesium alloys, Chemical conversion, Coatings, Corrosion, Nanocrystalline zinc

Citation Format(s)