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利用扫描电镜、能谱仪、X射线衍射仪分析了不同固溶处理温度下Mg-2Nd-2Gd-0.3Sr-0.2Zn-0.4Zr镁合金的显微结构,采用析氢和质量损失法测试了合金在模拟体液中的腐蚀性能。结果表明,随着固溶温度的升高,合金中共晶相含量减少,且由相对连续分布转变为不连续性分布,晶粒有所长大,晶粒内部针状析出相增多;合金在模拟体液中的腐蚀速率顺序为540℃<495℃<525℃<510℃,并呈均匀腐蚀,表明当合金中共晶相连续分布时,耐蚀性能较好,当共晶相不连续分布时,共晶相含量越少合金的耐蚀性越好,且其含量和分布对合金腐蚀方式没有明显影响,而晶粒内富Zr析出相增加了合金局部腐蚀倾向性。
The microstructure of Mg-2Nd-2Gd-0.3Sr-0.2Zn-0.4Zr magnesium alloy at different solution treatment temperatures was analyzed by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffractometer. The alloys were tested by means of hydrogen evolution and mass loss Corrosion in simulated body fluids. The results show that with the increase of solution temperature, the content of eutectic phase in the alloy decreases and the relative continuous distribution changes to the discontinuous distribution, the grains grow up and the number of pin-out phases in the grains increases. Corrosion rates in body fluids were in order of 540 ℃ <495 ℃ <525 ℃ <510 ℃, indicating that the eutectic phase had a good corrosion resistance when the eutectic phase was continuously distributed. When the eutectic phase was not continuously distributed The smaller the content of the crystalline phase is, the better the corrosion resistance of the alloy is. The content and distribution of the phase have no significant effect on the corrosion behavior of the alloy. However, the Zr-rich precipitates increase the local corrosion tendency of the alloy.