In vitro Degradation and Biocompatibility of Ca-P Coated Magnesium Alloy

Calcium-phosphate compounds（Ca-P） coating was prepared on an Mg-A1 alloy（AZ60）. Biodegradation of Ca-P coated magnesium alloy was evaluated in simulated body fluid（SBF） by examining the changes in magnesium ion concentration and pH value, which indicated that the Ca-P coating on magnesium alloy strongly affected the cor- rosion of magnesium alloy. Osteoblast MC3T3-E1 cells were utilized to investigate the cellular eytocompatibility. The cytocompatibility was measured by carrying out a series of tests, such as cholecystokinin-octapeptide（CCK-8） test, alkaline phosphatase activity（ALP） test, cellular morphology of hematoxylin-eosin（HE） staining and the induc- tion of apoptosis. It was found that the cell function showed better in the Ca-P coated Mg-alloy extract than in the uncoated magnesium alloy extract. In summary, the results indicate that the Ca-P coating can improve the corrosion resistance of magnesium alloy and elevate cellular proliferation and differentiation of osteoblast MC3T3-E1 cells.