Abstract: The MgZnCa alloy formed by casting and hot extrusion was systematically studied. The microstructure and mechanical behaviors of the alloy were analyzed by an optical microscopy and universal testing machine. The hydroxyapatite (HA) coatings on the surface of this magnesium alloy were deposited using a biomimetic technique. The HA coatings were characterized by XRD， and the morphology of the sample surface was observed by SEM. The degradation rates of the samples without and with HA coatings were researched invitro corrosion. The results indicated that the tensile strength and compressive strength of MgZnCa alloy were close to the human bones， and the values were 365MPa and 338MPa， respectively， and the yield strength， elongation and elastic modulus of the alloy were 360MPa， 1025%， 4169GPa， respectively. The degradation rates of the samples with HA coatings was slower than that of the samples without HA coatings on the surface.

Key words: MgZnCa alloys, HA coatings, mechanical properties, biomimetic coating technique, degradation rate