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Mater Sci Eng C Mater Biol Appl. 2013 Dec 1;33(8):5044-50. doi: 10.1016/j.msec.2013.08.033. Epub 2013 Sep 4.

Improving the corrosion resistance of Mg-4.0Zn-0.2Ca alloy by micro-arc oxidation.

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  • 1The First Affiliated Hospital of Harbin Medical University, Harbin 150001, PR China.

Abstract

In this paper, corrosion resistance of the Mg-4.0Zn-0.2Ca alloy was modified by micro-arc oxidation (MAO) process. The microstructure and phase constituents of MAO layer were characterized by SEM, XRD and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of MAO treated Mg-4.0Zn-0.2Ca alloy in the simulated body fluid were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The microstructure results indicated that a kind of ceramic film was composed by MgO and MgF2 was formed on the surface of Mg-4.0Zn-0.2Ca alloy after MAO treatment. The electrochemical test reveals that the corrosion resistance of MAO treated samples increase 1 order of magnitude. The mechanical intensity test showed that the MAO treated samples has suitable mechanical properties.

© 2013.

KEYWORDS:

Biodegradation; Corrosion resistance; Mg–Zn–Ca; Micro-arc oxidation; Microstructure

PMID:
24094222
[PubMed - indexed for MEDLINE]
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