The effects of Ca content on porosity

microstructure

phase composition

compressive strength

micro-hardness and corrosion resistance of porous Mg-1Zn-xCa alloys were investigated.The results reveal that with the increase of Ca contents

the porosities of porous Mg-1Zn-xCa alloys are decreased.However

the compressive strength and micro-hardness of the alloy are increased firstly and then decreased slightly.The compressive strength and micro-hardness of porous Mg-1Zn-2Ca reach 35.6MPa and 51.2HV

respectively

which are 46.5% and 35.4% higher than those of porous Mg-1Zn alloy.SEM analysis shows that the compactness of the pore cell（porous material matrix）of porous Mg-1Zn-xCa alloy is increased with the increase of Ca contents.XRD and EDS analysis show that the porous Mg-1Zn-2Ca alloy is composed of single phase ofα-Mg solid solution

and porous Mg-1Zn-2.5Ca alloy consists of two phases ofα-Mg and Mg2 Ca.Corrosion resistance measurement reveals that the corrosion rates of porous Mg-1Zn-xCa alloys are decreased firstly and then increased slightly by increasing in Ca content.The porous Mg-1Zn-2Ca alloy has the minimum corrosion rate of 0.15mm·a

-1

and desirable corrosion resistance with immersed in SBF for 48 h.