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Evaluation of Coatings for Mg Alloys for Biomedical Applications.
- Source :
- Advanced Engineering Materials; Jan2015, Vol. 17 Issue 1, p58-67, 10p
- Publication Year :
- 2015
-
Abstract
- The aim of this work was to assess a number of coatings developed for Mg for biomedical applications. The Mg substrates were high-purity (HP) Mg and ME10, an alloy recently developed for improved extrudability. The research utilized the new fishing-line specimen configuration to allow direct comparison to our recent in vivo and in vitro measurements. The in vitro measurements were immersion tests of fishing-line specimens immersed in Nor's solution at 37 °C. Tests of substantial duration are needed because the corrosion rates of uncoated samples are low. Nor's solution is the designation given to Hank's solution through which CO<subscript>2</subscript> is bubbled at a partial pressure of 0.009 atm. In this solution, pH is maintained constant by the interaction of CO<subscript>2</subscript> and the bicarbonate ions in the solution. This is the same buffer as that which maintains the pH of blood. Coatings examined were: (i) an anodization using a bio-friendly alkaline electrolyte consisting of phosphate, borate, and metasilicate, (ii) octyltrimethoxysilane (OSi), (iii) 1,2-bis[triethoxysilyl]ethane (BTSE), (iv) anodization +OSi, and (v) anodization + BTSE. The performance of coated samples was comparable to or better than that of the uncoated samples, and there was a substantially better performance for the ME10 samples after anodization +OSi. Reasons for the various performances are discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14381656
- Volume :
- 17
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Advanced Engineering Materials
- Publication Type :
- Academic Journal
- Accession number :
- 102211371
- Full Text :
- https://doi.org/10.1002/adem.201300516