A mechanistic in vitro study of the microgalvanic degradation of secondary phase particles in magnesium alloys

Walter, R., and Mathan, M. Bobby (2015) A mechanistic in vitro study of the microgalvanic degradation of secondary phase particles in magnesium alloys. Journal of Biomedical Materials Research Part A, 103 (3). pp. 990-1000.

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Abstract

The aim of this work was to understand the effect of microgalvanic degradation on secondary phase particles in magnesium alloys under in vitro condition. Pure magnesium and Mg17Al12 (β-phase) were galvanically coupled in simulated body fluid and the degradation behavior was studied using electrochemical impedance spectroscopy. The galvanic coupling produced a phosphate/carbonate layer on the β-phase, which initially increased the degradation resistance. However, the deposited phosphate/carbonate layer rapidly degraded once the galvanic coupling was removed, and β-phase exhibited similar degradation resistance to that of pure magnesium. A phenomenological model has been presented, demonstrating the galvanic coupling effect.

Item ID: 33598
Item Type: Article (Research - C1)
ISSN: 1552-4965
Keywords: magnesium; biodegradation; galvanic effect; in vitro test
Date Deposited: 18 Jun 2014 04:21
FoR Codes: 09 ENGINEERING > 0903 Biomedical Engineering > 090301 Biomaterials @ 100%
SEO Codes: 86 MANUFACTURING > 8611 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) > 861199 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) not elsewhere classified @ 100%
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