The effect of interlayer on corrosion resistance of ceramic coating/Mg alloy substrate in simulated physiological environment

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

32 Scopus Citations
View graph of relations

Author(s)

  • Guosong Wu
  • Ali Shanaghi
  • Ying Zhao
  • Xuming Zhang
  • Ruizhen Xu
  • Zhengwei Wu
  • Guangyao Li

Detail(s)

Original languageEnglish
Pages (from-to)4892-4898
Journal / PublicationSurface and Coatings Technology
Volume206
Issue number23
Publication statusPublished - 15 Jul 2012

Abstract

Ceramic coatings are deposited on biodegradable magnesium alloys by physical vapor deposition to reduce the electrochemical activity in the simulated physiological environment. Although an interlayer is generally used to reduce the mismatch between the hard coating and soft substrate, the effects of the interlayer on the electrochemical corrosion behavior have seldom been explored. In this work, AlO xN y ceramic coatings were deposited on AZ31 magnesium alloys with Al or Ti interlayers. Polarization tests and electrochemical impedance spectroscopy (EIS) were conducted to evaluate the corrosion resistance in the cell culture medium. The AlO xN y ceramic coating significantly improved the bio-corrosion resistance of the magnesium alloy, but the Ti interlayer accelerated the corrosion rate. In comparison, although the addition of an Al interlayer led to smaller enhancement in the surface mechanical properties of the AlO xN y coating, corrosion could be impeded effectively. Our results indicate that an Al interlayer is preferred over Ti and the corrosion failure mechanism is discussed from the perspective of defects. © 2012 Elsevier B.V.

Research Area(s)

  • Biomaterials, Ceramic coatings, Corrosion, Interlayer, Magnesium alloys

Citation Format(s)

The effect of interlayer on corrosion resistance of ceramic coating/Mg alloy substrate in simulated physiological environment. / Wu, Guosong; Shanaghi, Ali; Zhao, Ying; Zhang, Xuming; Xu, Ruizhen; Wu, Zhengwei; Li, Guangyao; Chu, Paul K.

In: Surface and Coatings Technology, Vol. 206, No. 23, 15.07.2012, p. 4892-4898.

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