Growth mechanism of hydroxyapatite-coatings formed on pure magnesium and corrosion behavior of the coated magnesium

Masanari Tomozawa, Sachiko Hiromoto

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

Hydroxyapatite (HAp) coatings were uniformly formed on pure Mg by a hydrothermal treatment using a C 10 H 12 N 2 O 8 Na 2 Ca (Ca-EDTA) solution. The growth mechanism of the HAp coating was investigated with XRD, SEM and TEM. At the initial stage, dome-shape HAp precipitates were formed on the Mg. Subsequently, the precipitates grew and the coating became a dual-layer consisting of an inner dense HAp layer and outer course layer consisting of rod-like HAp crystals. The protectiveness of the coatings with different treatment times was investigated by a polarization test in a 3.5 wt.% NaCl solution. The corrosion current density decreased with the growth of the HAp coating.

Original languageEnglish
Pages (from-to)8253-8257
Number of pages5
JournalApplied Surface Science
Volume257
Issue number19
DOIs
Publication statusPublished - 2011 Jul 15
Externally publishedYes

Keywords

  • Bioabsorbable metals
  • Corrosion resistant coatings
  • Hydrothermal treatment
  • Hydroxyapatite
  • Magnesium

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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