Surface modification of biomedical magnesium alloy wires by micro-arc oxidation

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

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Detail(s)

Original languageEnglish
Pages (from-to)1058-1064
Journal / PublicationTransactions of Nonferrous Metals Society of China (English Edition)
Volume24
Issue number4
Publication statusPublished - Apr 2014

Abstract

Magnesium alloy wires were processed by micro-arc oxidation (MAO) in a modified silicate-phosphate composite electrolyte containing hydroxyapatite (HA) nanopowders and NaOH. Effects of NaOH content in the composite electrolyte on the microstructure and properties of the MAO ceramic coatings on magnesium alloy wires were studied. It is found that the arc voltage of magnesium alloy wires in the micro-arc oxidation process is significantly reduced while the oxidation rate is accelerated. Addition of 2 g/L NaOH in the composite electrolyte is a better choice for improving corrosion resistance of magnesium alloy wires. During early simulated body fluids (SBF) immersion, the micro-arc oxidized magnesium alloy wires undergo a slow and stable degradation. After soaking for 28 d, the protective ceramic coating still shows no damage but significant degradation is observed for magnesium alloy wires after immersion for more than 60 d. © 2014 The Nonferrous Metals Society of China.

Research Area(s)

  • corrosion resistance, hydroxyapatite, magnesium alloy wire, micro-arc oxidation

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