Hydroxyapatite/poly(Éε-caprolactone) double coating on magnesium for enhanced corrosion resistance and coating flexibility

Ji Hoon Jo, Yuanlong Li, Sae Mi Kim, Hyoun Ee Kim, Young Hag Koh

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Hydroxyapatite was deposited on pure magnesium (Mg) with a flexible poly(Éε-caprolactone) interlayer to reduce the corrosion rate of Mg and enhance coating flexibility. The poly(Éε-caprolactone) interlayer was uniformly coated on Mg by a spraying method, followed by hydroxyapatite deposition on the poly(Éε-caprolactone) using an aerosol deposition method. In scanning electron microscopy observations, inorganic/organic composite-like structure was observed between the hydroxyapatite and poly(Éε-caprolactone) layers, resulting from the collisions of hydroxyapatite particles into the poly(Éε- caprolactone) matrix at the initial stage of the aerosol deposition. The corrosion resistance of the coated Mg was examined using potentiodynamic polarization tests. The hydroxyapatite/poly(Éε-caprolactone) double coating remarkably improved the corrosion resistance of Mg in Hank's solution. In the in vitro cell tests, the coated Mg showed better cell adhesion compared with the bare Mg due to the reduced corrosion rate and enhanced biocompatibility. The stability and flexibility of hydroxyapatite/ poly(Éε-caprolactone) double coating was investigated by scanning electron microscopy inspections after the coated Mg was deformed. The hydroxyapatite coating on the poly(Éε-caprolactone) interlayer revealed enhanced coating stability and flexibility without cracking or delamination during bending and stretching compared with the hydroxyapatite single coating. These results demonstrated that the hydroxyapatite/ poly(Éε-caprolactone) double coating significantly improved the surface corrosion resistance of Mg and enhanced coating flexibility for use of Mg as a biodegradable implant.

Original languageEnglish
Pages (from-to)617-625
Number of pages9
JournalJournal of Biomaterials Applications
Issue number4
Publication statusPublished - 2013 Nov

Bibliographical note

Funding Information:
This study was supported by WCU (World Class University) project through National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (R31-2008-000-10075-0) and by the Technology Innovation Program (contract no. 10037915, WPM Biomedical Materials – Implant Materials) funded by the Ministry of Knowledge Economy (MKE, Korea).


  • Magnesium
  • biodegradation
  • flexibility
  • hydroxyapatite coating
  • poly(Éε-caprolactone) interlayer

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering


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