FORMATION OF HA-CONTAINING COATING ON AZ31 MAGNESIUM ALLOY BY MICRO-ARC OXIDATION

Hui Tang, Deyu Li, Xiuping Chen, Chao Wu and Fuping Wang ()
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Hui Tang: School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
Deyu Li: School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
Xiuping Chen: School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
Chao Wu: School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
Fuping Wang: School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China

Surface Review and Letters (SRL), 2013, vol. 20, issue 03n04, 1-6

Abstract: Magnesium and its alloys are potential biodegradable implant materials due to their attractive biological properties. But the use of magnesium is still hampered by its poor corrosion resistance in physiological fluids. In this study, a HA-containing coating was fabricated by micro-arc oxidation (MAO). The active plasma species of micro-discharge was studied by optical emission spectroscopy (OES). The microstructure and composition were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion behavior and apatite-forming ability were studied by electrochemical tests and immersed samples in simulated body fluids (SBF). The results show that the microdischarge channel model is gas discharges and oxide layer discharges. The elements from the substrate and electrolyte take part in the formation of the coating. The MAO coating significantly improves the corrosion resistance of AZ31 magnesium alloy and enhances the apatite formation ability.

Keywords: Magnesium alloy; hydroxyapatite; micro-arc oxidation; optical emission spectrum; corrosion resistance; apatite-forming ability (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0218625X13500261

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