How to cite this article: Kannan MB. 2013. Improving the packing density of calcium phosphate coating on a magnesium alloy for enhanced degradation resistance. J Biomed Mater Res Part A 2013:101A:1248–1254.
Improving the packing density of calcium phosphate coating on a magnesium alloy for enhanced degradation resistance†
Article first published online: 24 SEP 2012
Copyright © 2012 Wiley Periodicals, Inc.
Journal of Biomedical Materials Research Part A
Volume 101A, Issue 5, pages 1248–1254, May 2013
How to Cite
Kannan, M. B. (2013), Improving the packing density of calcium phosphate coating on a magnesium alloy for enhanced degradation resistance. J. Biomed. Mater. Res., 101A: 1248–1254. doi: 10.1002/jbm.a.34423
- Issue published online: 25 MAR 2013
- Article first published online: 24 SEP 2012
- Manuscript Accepted: 9 AUG 2012
- Manuscript Received: 17 JUN 2012
- NACE International
- calcium phosphate;
In this study, an attempt was made to improve the packing density of calcium phosphate (CaP) coating on a magnesium alloy by tailoring the coating solution for enhanced degradation resistance of the alloy for implant applications. An organic solvent, ethanol, was added to the coating solution to decrease the conductivity of the coating solution so that hydrogen bubble formation/bursting reduces during the CaP coating process. Experimental results confirmed that ethanol addition to the coating solution reduces the conductivity of the solution and also decreases the hydrogen evolution/bubble bursting. In vitro electrochemical experiments, that is, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization showed that CaP coating produced in 30% (v/v) ethanol containing coating solution (3E) exhibits significantly higher degradation resistance (i.e., ∼50% higher polarization resistance and ∼60% lower corrosion current) than the aqueous solution coating. Scanning electron microscope (SEM) analysis of the coatings revealed that the packing of 3E coating was denser than that of aqueous coating, which can be attributed to the lower hydrogen evolution in the former than in the latter. Further increase in the ethanol content in the coating solution was not beneficial; in fact, the coating produced in 70% (v/v) ethanol containing solution (7E) showed degradation resistance much inferior to that of the aqueous coating, which is due to low thickness of 7E coating. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2013.