PMID- 23008190
OWN - NLM
STAT- MEDLINE
DCOM- 20130909
LR  - 20131121
IS  - 1552-4965 (Electronic)
IS  - 1549-3296 (Linking)
VI  - 101
IP  - 5
DP  - 2013 May
TI  - Improving the packing density of calcium phosphate coating on a magnesium alloy 
      for enhanced degradation resistance.
PG  - 1248-54
LID - 10.1002/jbm.a.34423 [doi]
AB  - 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.
CI  - Copyright (c) 2012 Wiley Periodicals, Inc.
FAU - Kannan, M Bobby
AU  - Kannan MB
AD  - Discipline of Chemical Engineering, School of Engineering and Physical Sciences, 
      James Cook University, Townsville, Queensland 4811, Australia. 
      bobby.mathan@jcu.edu.au
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20120924
PL  - United States
TA  - J Biomed Mater Res A
JT  - Journal of biomedical materials research. Part A
JID - 101234237
RN  - 0 (Alloys)
RN  - 0 (Calcium Phosphates)
RN  - 0 (Coated Materials, Biocompatible)
RN  - 3K9958V90M (Ethanol)
RN  - 97Z1WI3NDX (calcium phosphate)
RN  - I38ZP9992A (Magnesium)
SB  - IM
MH  - Alloys/*chemistry
MH  - Calcium Phosphates/*chemistry
MH  - Coated Materials, Biocompatible/*chemistry
MH  - Corrosion
MH  - Dielectric Spectroscopy
MH  - Electric Conductivity
MH  - Electrochemical Techniques
MH  - Ethanol/chemistry
MH  - Magnesium/*chemistry
MH  - Materials Testing
MH  - Prostheses and Implants
EDAT- 2012/09/26 06:00
MHDA- 2013/09/10 06:00
CRDT- 2012/09/26 06:00
PHST- 2012/06/17 00:00 [received]
PHST- 2012/08/09 00:00 [accepted]
PHST- 2012/09/26 06:00 [entrez]
PHST- 2012/09/26 06:00 [pubmed]
PHST- 2013/09/10 06:00 [medline]
AID - 10.1002/jbm.a.34423 [doi]
PST - ppublish
SO  - J Biomed Mater Res A. 2013 May;101(5):1248-54. doi: 10.1002/jbm.a.34423. Epub 
      2012 Sep 24.