Influence of the cathodic activity of magnesium alloys on the electrochemical deposition of calcium phosphate

Walter, R., Kannan, M. Bobby, He, Y., and Sandham, A. (2014) Influence of the cathodic activity of magnesium alloys on the electrochemical deposition of calcium phosphate. Materials Letters, 130. pp. 184-187.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1016/j.matlet.2014....
 
7
3


Abstract

The aim of this study was to investigate whether the cathodic activity of magnesium alloys plays a significant role on the electrochemical deposition of calcium phosphate (CaP). CaP was deposited electrochemically on two magnesium alloys, i.e., magnesium–calcium (Mg–Ca) and magnesium–aluminium–zinc (AZ91), with different electrochemical degradation behaviour. The in vitro degradation behaviour of the CaP coated samples was evaluated using electrochemical impedance spectroscopy (EIS) in simulated body fluid (SBF). The polarisation resistance (RP) of the CaP coated Mg–Ca alloy was ~85% lower than that of the CaP coated AZ91 alloy. Fourier transform infrared (FTIR) analysis showed no difference in the chemical nature of the coatings. However, scanning electron microscopy (SEM) analysis revealed that the coating particles on Mg–Ca alloy were less densely packed than those on the AZ91 alloy. This can be attributed to the higher dissolution rate of Mg–Ca alloy as compared to AZ91 alloy. As a result, the former exhibited higher cathodic charge density which produced higher hydrogen evolution, thereby affecting the coating process.

Item ID: 33592
Item Type: Article (Refereed Research - C1)
Keywords: magnesium alloy; biomaterials; calcium phosphate; degradation
ISSN: 1873-4979
Date Deposited: 10 Jun 2014 04:12
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%
Downloads: Total: 3
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page