采用熔体旋淬和铜模喷铸法制备了不同Sn含量的Mg-Zn-Ca-Sn合金带材和直径2 mm的棒材试样.运用XRD、SEM、DSC和电化学测试方法研究了Sn元素对Mg-Zn-Ca合金非晶形成能力和在模拟体液中腐蚀行为的影响.结果表明,带材组织均为非晶态,而棒材试样随着Sn含量的增加,由不含Sn元素的完全非晶态,逐渐转变为由Mg和Mg2Sn相组成的多晶态组织,说明Sn元素的添加恶化了Mg-Zn-Ca合金的非晶形成能力.电化学腐蚀测试结果表明随着Sn含量的增多,腐蚀电位负向移动,腐蚀电流密度增大,合金的耐蚀性逐渐下降.
Ribbon and rod (2 mm in diameter) samples of Mg-Zn-Ca-Sn alloys were prepared by melt-spinning and copper mould injection.Effect of Sn addition on glass forming ability and bio-corrosion behavior in simulated body fluids of Mg-Zn-Ca alloys was studied by means of X-ray diffraction,scanning electron microscopy,differential scanning calorimeter and electrochemical test.The results show that with the increasing content of Sn element,all ribbon samples are in completely amorphous state.However,the microstructure of 2 mm rod samples transforms from fully amorphous to almost polycrystalline state with precipitates Mg and Mg2Sn phases.It indicates that the addition of Sn decreases the glass forming ability of the Mg65Zn30Ca5 alloy.The results of electrochemical test demonstrate that Sn-doped samples exhibit more negative corrosion potential and larger corrosion current density,which suggests that the corrosion resistance decreases with increasing content of Sn element.
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