Effect of surface roughness on the in vitro degradation behaviour of a biodegradable magnesium-based alloy

Walter, R., Kannan, M. Bobby, He, Y., and Sandham, A. (2013) Effect of surface roughness on the in vitro degradation behaviour of a biodegradable magnesium-based alloy. Applied Surface Science, 279. pp. 343-348.

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Abstract

In this study, the in vitro degradation behaviour of AZ91 magnesium alloy with two different surface finishes was investigated using electrochemical impedance spectroscopy (EIS) in simulated body fluid (SBF). The polarisation resistance (Rp) of the rough surface alloy immersed in SBF for 3 h was ~30% lower as compared to that of the smooth surface alloy. After 12 h immersion in SBF, the Rp values for both the surface finishes decreased and were also similar. However, localised degradation occurred sooner, and to a noticeably higher severity in the rough surface alloy as compared to the smooth surface alloy.

Item ID: 28086
Item Type: Article (Refereed Research - C1)
Keywords: magnesium; biomaterials; surface roughness; pitting corrosion; passivity
ISSN: 1873-5584
Funders: Australian Denal Research Federation (ADRF)
Date Deposited: 19 Jul 2013 06:58
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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