Abstract
In present work, calcium phosphate coatings on AZ91 substrate were prepared by pulse electrodeposition at different duty cycle (0.05, 0.10, 0.15, 0.20) in the mixed solution of 0.1M Ca(NO3)2 and 0.06M NH4H2PO4 at 60°C. Phase composition and corrosion behavior of the as-deposited coatings were studied. Results showed that the calcium phosphate coatings had a grass-like structure. As the duty cycle increased, phase composition of the coatings changed from hydroxyapatite (HA) to mixture of HA and dicalcium phosphate dihydrate (DCPD). The adhesion of strength between the coatings and the substrate were higher than 10MPa. Potentiodynamic polarization test and electrochemical impedance spectroscopy test in simulated body fluid (SBF) indicated that the samples deposited with calcium phosphate coatings exhibited better corrosion resistance as compared with the bare AZ91 alloy.
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