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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Micro-alloying and Microstructure on the Corrosion Behavior of As-Cast Mg-6.2 wt.% Zn Alloy
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Effect of Micro-alloying and Microstructure on the Corrosion Behavior of As-Cast Mg-6.2 wt.% Zn Alloy

机译：微合金化和微观结构对铸造Mg-6.2重量％的腐蚀行为的影响。％Zn合金

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摘要

The corrosion behavior of the Mg-6.2 (wt.%) Zn alloys with the micro-addition of Zr (0.6 wt. %) and a combination of Ag (0.4 wt.%), Ca (0.2 wt. %), and Zr (0.6 wt. %) was investigated in freely aerated 3.5% NaCl solution using immersion testing for 20 h. The microstructural observation before and after the immersion test helped to comprehend the effect of grain size and second-phase precipitate (cathodic phase) area fraction along with the chemical composition on the corrosion behavior of the alloys. Fine grain size with a homogeneous distribution of the precipitates in the Mg-6.2Zn-0.2Ca-0.4Ag-0.6Zr (wt.%) was found to have greater corrosion resistance by forming micro-galvanic couples in a more uniform way. The corroded surface after immersion test was characterized using X-ray diffraction and Fourier transformed infrared spectroscopy. Insoluble complex carbonates of Mg and Ca in the corrosion products were found to protect the metal surface of the Ca containing alloy from further corrosive attacks.
机译：微量添加Zr（0.6 wt.%）和Ag（0.4 wt.%）、Ca（0.2 wt.%）、Ca（0.2 wt.%）的Mg-6.2（wt.%）Zn合金的腐蚀行为，Zr（0.6 wt.%）在3.5%NaCl溶液中进行了20 h的浸没试验。浸没试验前后的微观结构观察有助于理解晶粒尺寸和第二相沉淀（阴极相）面积分数以及化学成分对合金腐蚀行为的影响。通过以更均匀的方式形成微电偶，发现在Mg-6.2Zn-0.2Ca-0.4Ag-0.6Zr（重量%）中具有均匀分布的沉淀的细晶粒尺寸具有更高的耐腐蚀性。通过X射线衍射和傅里叶变换红外光谱对浸没试验后的腐蚀表面进行了表征。腐蚀产物中的镁和钙的不溶性复合碳酸盐可保护含钙合金的金属表面免受进一步的腐蚀侵蚀。

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