Calcium phosphate coating on magnesium alloy for modification of degradation behavior |
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| Authors: | Fu-zhai Cui Jing-xin Yang Yan-peng Jiao Qing-shui Yin Yu Zhang and In-Seop Lee |
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| Affiliation: | (1) Advanced Materials Laboratory, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;(2) Department of Orthopedics, General Hospital of Guangzhou Military Command of PLA, Guangzhou, 510010, China;(3) Institute of Physics and Applied Physics, and Atomic-scale Surface Science Research Center, Yonsei University, Seoul, 120-749, Korea |
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| Abstract: | Magnesium alloy has similar mechanical properties with natural bone, but its high susceptibility to corrosion has limited
its application in orthopedics. In this study, a calcium phosphate coating is formed on magnesium alloy (AZ31) to control
its degradation rate and enhance its bioactivity and bone inductivity. Samples of AZ31 plate were placed in the supersaturated
calcification solution prepared with Ca(NO3)2, NaH2PO4 and NaHCO3, then the calcium phosphate coating formed. Through adjusting the immersion time, the thickness of uniform coatings can be
changed from 10 to 20 μm. The composition, phase structure and morphology of the coatings were investigated. Bonding strength
of the coatings and substrate was 2–4 MPa in this study. The coatings significantly decrease degradation rate of the original
Mg alloy, indicating that the Mg alloy with calcium phosphate coating is a promising degradable bone material. |
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| Keywords: | metal (alloys) calcium phosphate(s) coating(s) degradation dental/endosteal implant |
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