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为了改善Mg-Zn二元合金的耐腐蚀性能,制备了Sr含量分别为0.2%、0.4%、0.6%和1.0%的Mg-4Zn-xSr三元镁合金。采用光学显微镜、X射线衍射仪和配备有X射线光电子能谱仪的扫描电子显微镜观察合金的微观组织与相组成,采用失重实验研究合金在模拟体液中的腐蚀性能。采用电化学测试方法测试合金在模拟体液中的极化曲线。结果表明,Sr含量为0.2%的合金腐蚀速率最小,自腐蚀电位最高,腐蚀方式为均匀腐蚀。
In order to improve the corrosion resistance of Mg-Zn binary alloys, Mg-4Zn-xSr ternary magnesium alloys with Sr content of 0.2%, 0.4%, 0.6% and 1.0% were prepared. The microstructure and phase composition of the alloy were observed by optical microscope, X-ray diffractometer and scanning electron microscope equipped with X-ray photoelectron spectrometer. The corrosion behavior of the alloy in simulated body fluid was studied by weight loss experiment. Electrochemical test method is used to test the polarization curve of alloy in simulated body fluid. The results show that the alloy with 0.2% Sr has the lowest corrosion rate, the highest corrosion potential and the uniform corrosion.