Abstract
Calcium phosphate (Ca-P) coatings were deposited on AZ31 magnesium by hydrothermal treatment at various pH values to improve the corrosion resistance and biocompatibility of magnesium alloys. The crystal phase, morphology and composition of the coatings were investigated by XRD, SEM and EDS, respectively. Electrochemical measurements and immersion tests were performed in Hank's solution to examine the bio-corrosion behaviors of the coated specimens. The results show that the pH value of solutions influences the phase composition and microstructure of the coating. And the degree of protection provided by the Ca-P coating varies with its microstructure. The deposited Ca-P coating treated at pH=6 is composed of OCP (Ca8H2(PO4)6·5H2O). When the pH value increases to 8 and 10, only the HA is formed. The HA coating with nano-scale and rod-like crystals prepared at pH=10 can prevent the penetration of solution more effectively than the OCP coating at pH=6 and the honeycomb-like HA coating at pH=8.
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