Abstract
The microstructure, mechanical properties and in vitro degradation behavior of Zn-x Ca (x = 0.5, 1, 2, 3 wt%) alloys were investigated with pure Zn as control. The results indicated Zn-Ca alloys exhibited much stronger hardness and faster corrosion rate than those of pure Zn. And Zn-2Ca alloy presented the superior comprehensive performance with 90.94 ± 1.71 HV, 0.074 ± 0.010 mm·y−1 (weight loss) and 0.084 ± 0.021 mm·y−1 (polarization curve). And the element analysis indicated the corrosion products preferentially formed in the two-phase boundary and the main composition was calcium orthophosphate, which was the main constituent in human bone and teeth. Those results suggested Zn-Ca alloys, especial for Zn-2Ca alloy, would be promising as biodegradable implant material.
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