Enhancement of calcium phosphate formation on zirconium by micro-arc oxidation and chemical treatments

Jung Yun Ha, Yusuke Tsutsumi, Hisashi Doi, Naoyuki Nomura, Kyo Han Kim, Takao Hanawa

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Surface treatments with various combinations of micro-arc oxidation (MAO) and chemical treatments were performed on zirconium (Zr) disks in this study to enhance the bioactivity of Zr. The surface oxide layers formed with MAO and chemical treatments on Zr disks were characterized using surface analyses; the calcium phosphate formation on the specimens after immersion in Hanks' solution was evaluated. As a result, thick calcium phosphate layers formed on Zr specimens that underwent MAO treatment with a mixture of calcium glycerophosphate and magnesium acetate and subsequent chemical treatment with sulfuric acid or sodium hydroxide solutions, while no precipitate was observed without treatment. The surface analyses revealed that the porous oxide layer formed by MAO treatment contained Ca, P, and Mg, which were incorporated from the electrolytes during the treatments. In addition, both the composition and crystal structure of the oxide layers uniquely changed as a result of the various chemical treatments.

Original languageEnglish
Pages (from-to)4948-4955
Number of pages8
JournalSurface and Coatings Technology
Issue number21-22
Publication statusPublished - 2011 Aug 25


  • Bioactivity
  • Calcium phosphate
  • Chemical treatment
  • Micro-arc oxidation
  • Zirconium


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