Self-dissolution assisted coating on magnesium metal for biodegradable bone fixation devices

Khakbaz, Hadis, Walter, Rhys, Gordon, Timothy, and Mathan, M. Bobby (2014) Self-dissolution assisted coating on magnesium metal for biodegradable bone fixation devices. Materials Research Express, 1 (4). pp. 1-9.

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Abstract

An attempt was made to develop a self-dissolution assisted coating on a pure magnesium metal for potential bone fixation implants. Magnesium phosphate cement (MPC) was coated successfully on the magnesium metal in ammonium dihydrogen phosphate solution. The in vitro degradation behaviour of the MPC coated metal was evaluated using electrochemical techniques. The MPC coating increased the polarisation resistance (RP) of the metal by ~150% after 2 h immersion in simulated body fluid (SBF) and reduced the corrosion current density (icorr) by ~80%. The RP of the MPC coated metal remained relatively high even after 8 h immersion period. However, post-degradation analysis of the MPC coated metal revealed localized attack. Hence, the study suggests that MPC coating alone may not be beneficial, but this novel coating could provide additional protection if used as a precursor for other potential coatings such as biodegradable polymers or calcium phosphates.

Item ID: 38572
Item Type: Article (Refereed Research - C1)
Keywords: magnesium, biomaterials, magnesium phosphate cement, degradation
ISSN: 2053-1591
Date Deposited: 29 Apr 2015 04:01
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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