Authors: Sanjay Singh R Manoj Kumar Kishor Kumar Kuntal Pallavi Gupta Snehashish Das R Jayaganthan Partha Roy Debrupa Lahiri
Publish Date: 2015/03/17
Volume: 67, Issue: 4, Pages: 702-712
Abstract
In recent years magnesium and its alloys have gained a lot of interest as orthopedic implant constituents because their biodegradability and mechanical properties are closer to that of human bone However one major concern with Mg in orthopedics is its high corrosion rate that results in the reduction of mechanical integrity before healing the bone tissue The current study evaluates the sol–gel–derived hydroxyapatite HA coating on a selected Mg alloy Mg3Zn for decreasing the corrosion rate and increasing the bioactivity of the Mg surface The mechanical integrity of the coating is established as a function of the surface roughness of the substrate and the sintering temperature of the coating Coating on a substrate roughness of 15–20 nm and sintering at 400°C shows the mechanical properties in similar range of bone thus making it suitable to avoid the stressshielding effect The hydroxyapatite coating on the Mg alloy surface also increases corrosion resistance very significantly by 40 times Bone cells are also found proliferating better in the HAcoated surface All these benefits together establish the candidature of sol–gel HAcoated Mg3Zn alloy in orthopedic applicationThe authors are grateful to all the laboratory stuff at Metallurgical and Materials Engineering Department and Centre of Nano Technology Indian Institute of Technology Roorkee for their facilities The authors would like to thank Mr Khelendra Agarwal for his support during the experiments
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