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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion Behavior of Mg-6Al-1Zn+XRE Magnesium Alloy with Minor Addition of Yttrium
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Corrosion Behavior of Mg-6Al-1Zn+XRE Magnesium Alloy with Minor Addition of Yttrium

机译：微量添加钇对Mg-6Al-1Zn + XRE镁合金的腐蚀行为

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摘要

The effect of yttrium addition on the microstructure of Mg-6Al-1Zn alloy was investigated by optical microscopy, x-ray diffraction analysis, and scanning electron microscopy. The experimental alloys were prepared by melting high-purity Mg, Al, Zn, and Y, respectively. Melting was carried out in a Inconel 718 crucible under SF6 and ultra pure Ar (99.999%) gas mixture environment using electric arc furnace. The corrosion behavior of Mg-6Al-1Zn+xYttrium (x = 0.5, 1.0 and 1.5 wt.% Y) magnesium alloy with different levels of yttrium additions was studied in 3.5 wt.% NaCl solution. Microstructure of yttrium-added alloy shows that higher grainrefinement is obtained in Mg-6Al-1Zn+0.5wt.%Y. Increasing yttrium content reduces the size of alpha-grain and alters the distribution of the beta-phase (Mg17Al12) from continuous network morphology to small and dispersive distribution. It forms secondary intermetallic phase Al2Y which has high melting point along the grain boundary. The corrosion resistance of Mg-6Al-1Zn magnesium alloy improved with addition of Yttrium. It was confirmed by the results of electrochemical polarization test. Based on the polarization curves, it is seen that fine precipitates of Al-Y intermetallic phase in Mg-6Al-1Zn alloy decrease the corrosion current density, thereby improving the corrosion resistance of the Mg-6Al-1Zn magnesium alloy.
机译：通过光学显微镜，X射线衍射分析和扫描电子显微镜研究了钇添加对Mg-6Al-1Zn合金显微组织的影响。通过分别熔化高纯度的Mg，Al，Zn和Y制备实验合金。使用电弧炉在SF6和超纯Ar（99.999％）气体混合环境下在Inconel 718坩埚中进行熔融。在3.5 wt％的NaCl溶液中研究了Mg-6Al-1Zn + x钇（x = 0.5、1.0和1.5 wt。％Y）镁合金与不同含量的钇的腐蚀行为。添加钇的合金的微观结构表明，在Mg-6Al-1Zn + 0.5wt。％Y中可获得更高的晶粒细化度。钇含量的增加会减小α晶粒的尺寸，并使β相（Mg17Al12）的分布从连续的网络形态变为较小且分散的分布。它形成了沿晶界具有高熔点的二次金属间相Al2Y。添加钇可提高Mg-6Al-1Zn镁合金的耐蚀性。电化学极化试验的结果证实了这一点。从极化曲线可知，Mg-6Al-1Zn合金中的Al-Y金属间相的微细析出物降低了腐蚀电流密度，从而提高了Mg-6Al-1Zn镁合金的耐蚀性。

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