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Preparation and characterizations of calcium-phosphate-silicon-containing coating on a Mg-Zn-Ca alloy by a two-step microarc oxidation

Abstract

Magnesium alloys are the most promising implant materials due to their excellent biodegradability. However, their high degradation rate limits their applications. In this study, we produced calcium-phosphate (Ca-P) coatings and calcium-phosphate-silicon (Ca-P-Si) coatings by the one-step and the two-step micro-arc oxidation processes, respectively. The microstructure and chemical composition of the MAO coatings were characterized by using SEM, XRD, and EDS. The degradation behavior of the MAO coatings and the substrate were investigated using electrochemical techniques and immersion test in simulated body fluid (SBF). The results showed that the silicate was successfully incorporated into the Ca-P coating in the second MAO step, which also increased the coating’s thickness. The Ca-P-Si coatings remarkably reduced the corrosion rate of the Mg alloy and Ca-P coating during 18 days of immersion in SBF. In addition, the bone-like apatite layer on the sample surface demonstrates a good biomineralization ability of the Ca-P-Si coatings. Potentiodynamic polarization results showed that MAO coatings could obviously enhance the corrosion resistance of the Mg alloy. Moreover, the growth mechanism of MAO coating in the second step was proposed.

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Publication details

The article was received on 24 Apr 2017, accepted on 19 May 2017 and first published on 19 May 2017


Article type: Paper
DOI: 10.1039/C7CP02672B
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Preparation and characterizations of calcium-phosphate-silicon-containing coating on a Mg-Zn-Ca alloy by a two-step microarc oxidation

    J. Dou, Y. Chen, Y. Chi, H. Li, G. Gu and C. Chen, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP02672B

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