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Bioinorganic Chemistry and Applications
Volume 2013, Article ID 175756, 6 pages
Research Article

Preparation and Characterization of Hydroxyapatite Coating on AZ31 Mg Alloy for Implant Applications

1EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
2Graduate School of Engineering, Al-Azhar University, Nasr City, Cairo 11371, Egypt

Received 2 November 2012; Revised 19 January 2013; Accepted 21 January 2013

Academic Editor: Giovanni Natile

Copyright © 2013 S. A. Salman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Magnesium alloys as biodegradable metal implants in orthopaedic research received a lot of interest in recent years. They have attractive biological properties including being essential to human metabolism, biocompatibility, and biodegradability. However, magnesium can corrode too rapidly in the high-chloride environment of the physiological system, loosing mechanical integrity before the tissue has sufficiently healed. Hydroxyapatite (HAp) coating was proposed to decrease the corrosion rate and improve the bioactivity of magnesium alloy. Apatite has been cathodically deposited on the surface of Mg alloy from solution that composed of 3 mM Ca(H2PO4)2 and 7 mM CaCl2 at various applied potentials. The growing of HAp was confirmed on the surface of the coatings after immersion in SBF solution for 7 days. The coating obtained at −1.4 V showed higher corrosion resistance with bioactive behaviors.