Self-healing property of hydroxyapatite and octacalcium phosphate coatings on pure magnesium and magnesium alloy

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39 Citations (Scopus)

Abstract

Hydroxyapatite (HAp) and octacalcium phosphate (OCP) coatings were formed on AZ31 alloy and pure Mg, and the surfaces were scratched to expose the metal surface. The specimens were immersed in a cell-culture medium or 0.9% NaCl. Release of Mg ions was not accelerated by scratching. In both solutions, a corrosion product layer containing Mg and P was formed in the scratches; i.e., the coatings self-healed. The corrosion morphology of HAp-coated AZ31 was examined by periodic medium replacement or using a gelatine-added medium. The former enhanced calcium phosphate precipitation; the latter increased corrosion localization.

Original languageEnglish
Pages (from-to)284-294
Number of pages11
JournalCorrosion Science
Volume100
DOIs
Publication statusPublished - 2015 Nov
Externally publishedYes

Keywords

  • A. Ceramic
  • A. Magnesium
  • B. SEM
  • C. Oxide coatings

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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