Potentiostatic pulse-deposition of calcium phosphate on magnesium alloy for temporary implant applications: an in vitro corrosion study

Kannan, M. Bobby, and Wallipa, O. (2013) Potentiostatic pulse-deposition of calcium phosphate on magnesium alloy for temporary implant applications: an in vitro corrosion study. Materials Science and Engineering C, 33 (2). pp. 675-679.

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Abstract

In this study, a magnesium alloy (AZ91) was coated with calcium phosphate using potentiostatic pulse-potential and constant-potential methods and the in vitro corrosion behaviour of the coated samples was compared with the bare metal. In vitro corrosion studies were carried out using electrochemical impedance spectroscopy and potentiodynamic polarization in simulated body fluid (SBF) at 37°C. Calcium phosphate coatings enhanced the corrosion resistance of the alloy, however, the pulse-potential coating performed better than the constant-potential coating. The pulse-potential coating exhibited ~3 times higher polarization resistance than that of the constant-potential coating. The corrosion current density obtained from the potentiodynamic polarization curves was significantly less (~60%) for the pulse-deposition coating as compared to the constant-potential coating. Post-corrosion analysis revealed only slight corrosion on the pulse-potential coating, whereas the constant-potential coating exhibited a large number of corrosion particles attached to the coating. The better in vitro corrosion performance of the pulse-potential coating can be attributed to the closely packed calcium phosphate particles.

Item ID: 28134
Item Type: Article (Research - C1)
ISSN: 1873-0191
Keywords: magnesium alloy, biomaterial, calcium phosphate, corrosion
Date Deposited: 21 Jul 2013 23:14
FoR Codes: 09 ENGINEERING > 0903 Biomedical Engineering > 090301 Biomaterials @ 100%
SEO Codes: 86 MANUFACTURING > 8612 Fabricated Metal Products > 861201 Coated Metal and Metal-Coated Products @ 100%
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