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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。
The Mg-Zn-Ca-Sn alloy strip with different Sn content and the sample with the diameter of 2 mm were prepared by melt spinning and copper die casting. The effect of Sn on the amorphous formation ability and the corrosion behavior in Mg-Zn-Ca alloy was studied by XRD, SEM, DSC and electrochemical measurements. The results show that the microstructure of the strip is amorphous, and with the increase of Sn content, the sample of bar gradually changes from a completely amorphous state without Sn element to a polycrystalline structure composed of Mg and Mg2Sn phases. It indicates that the addition of Sn element deteriorates the amorphous formation ability of Mg-Zn-Ca alloy. Electrochemical corrosion test results show that with the increase of Sn content, the corrosion potential shifts negatively and the corrosion current density increases, and the corrosion resistance of the alloy decreases gradually.