Fabrication and characterization of bioactive composite coatings on Mg-Zn-Ca alloy by MAO/sol-gel

J. H. Gao, X. Y. Shi, B. Yang, S. S. Hou, E. C. Meng, Fangxia Guan, S. K. Guan

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

High corrosion rate and accumulation of hydrogen gas upon degradation impede magnesium alloys' clinical application as implants. In this work, micro-arc oxidation (MAO) was used to fabricate a porous coating on magnesium alloys as an intermediate layer to enhance the bonding strength of propolis layer. Then the composite coatings were fabricated using sol-gel method by dipping sample into the solution containing propolis and polylactic acid at 40°C. The corrosion resistance of the samples was determined based on potentiodynamic polarization experiments and immersion tests. Biocompatibility was designed by observing the attachment and growth of wharton's jelly-derived mesenchymal stem cells (WJCs) on substrates with MAO coating and substrates with composite coatings. The results showed that, compared with that of Mg-Zn-Ca alloy, the corrosion current density of the samples with composite coatings decreased from 5.37 × 10 -5 to 1.10 × 10 -6A/cm 2 and the corrosion potential increased by 240 mV. Composite coatings exhibit homogeneous corrosion behavior and can promote WJCs cell adhesion and proliferation. In the meantime, pH value was relatively stable during the immersion tests, which may be significant for cellular survival. In conclusion, our results indicate that composite coatings on Mg-Zn-Ca alloy fabricated by MAO/sol-gel method provide a new type bioactive material.

Original languageEnglish (US)
Pages (from-to)1681-1687
Number of pages7
JournalJournal of Materials Science: Materials in Electronics
Volume22
Issue number7
DOIs
StatePublished - Jul 2011
Externally publishedYes

Fingerprint

Corrosion
Composite coatings
Polymethyl Methacrylate
Sol-gels
Gels
Fabrication
Wharton Jelly
Oxidation
Propolis
Immersion
Magnesium alloys
Stem cells
Mesenchymal Stromal Cells
Magnesium
Sol-gel process
Coatings
Potentiodynamic polarization
Cell adhesion
Cell proliferation
Substrates

ASJC Scopus subject areas

  • Biophysics
  • Biomaterials
  • Bioengineering
  • Biomedical Engineering

Cite this

Fabrication and characterization of bioactive composite coatings on Mg-Zn-Ca alloy by MAO/sol-gel. / Gao, J. H.; Shi, X. Y.; Yang, B.; Hou, S. S.; Meng, E. C.; Guan, Fangxia; Guan, S. K.

In: Journal of Materials Science: Materials in Electronics, Vol. 22, No. 7, 07.2011, p. 1681-1687.

Research output: Contribution to journalArticle

Gao, J. H. ; Shi, X. Y. ; Yang, B. ; Hou, S. S. ; Meng, E. C. ; Guan, Fangxia ; Guan, S. K. / Fabrication and characterization of bioactive composite coatings on Mg-Zn-Ca alloy by MAO/sol-gel. In: Journal of Materials Science: Materials in Electronics. 2011 ; Vol. 22, No. 7. pp. 1681-1687.
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