Polylactic acid coating on a biodegradable magnesium alloy: an in vitro degradation study by electrochemical impedance spectroscopy

Alabbasi, Alyaa, Liyanaarachchi, S., and Kannan, M.B. (2012) Polylactic acid coating on a biodegradable magnesium alloy: an in vitro degradation study by electrochemical impedance spectroscopy. Thin Solid Films, 520 (23). pp. 6841-6844.

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Abstract

Polylactic acid (PLA) was coated on a biodegradable magnesium alloy, AZ91, using spin coating technique for temporary implant applications. The degradation behaviour of the coated alloy samples was evaluated using electrochemical impedance spectroscopy (EIS) method in simulated body fluid (SBF). EIS results suggested that the PLA coating enhanced the degradation resistance of the alloy significantly. Increase in the PLA coating thickness was found to increase the degradation resistance, but resulted in poor adhesion. Long-term EIS experiments of the PLA coated samples suggested that their degradation resistance gradually decreased with increase in SBF exposure time. However, the degradation resistance of the PLA coated samples was significantly higher than that of the bare metal even after a 48 h exposure to SBF.

Item ID: 23694
Item Type: Article (Research - C1)
ISSN: 0040-6090
Keywords: polylactic acid, magnesium alloy, biomaterials, biodegradation
Date Deposited: 17 Oct 2012 05:28
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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