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

作者：Walter R; Kannan M Bobby^*

来源：Journal of Biomedical Materials Research Part A, 2015, 103(3): 990-1000.

DOI：10.1002/jbm.a.35247

• magnesium
• biodegradation
• galvanic effect
• in vitro test

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 (-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 -phase, which initially increased the degradation resistance. However, the deposited phosphate/carbonate layer rapidly degraded once the galvanic coupling was removed, and -phase exhibited similar degradation resistance to that of pure magnesium. A phenomenological model has been presented, demonstrating the galvanic coupling effect.

• 出版日期2015-3