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首页> 外文期刊>International Journal of Electrochemical Science >Effect of the Precipitated Phases on Corrosion Behavior of Mg- Y-Nd Ternary Alloy
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Effect of the Precipitated Phases on Corrosion Behavior of Mg- Y-Nd Ternary Alloy

机译：沉淀相对Mg-Y-Nd三元合金腐蚀行为的影响

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Mg-5Y-xNd alloys (x=0.5, 1.0, 1.5 wt.%) were investigated to reveal the influence of precipitated phase on corrosion resistance. The microstructure, precipitated phases and corrosion behaviors of different samples were analyzed by scanning electron microscope, energy dispersive spectrometer and X-Ray Diffraction. The volume fraction of the Mg12(Y,Nd) phase increased, whereas that of the Mg3(Y,Nd) phase decreased with increasing Nd-content. The weight loss rate decreased from 10.9584 mg·cm-2·d-1 (23.0126 mm·y-1) to 6.2184 mg·cm-2·d-1 (13.0586 mm·y-1). The open circuit potential, potentiodynamic polarization curve, electrochemical impedance spectroscope and scanning kelvin probe confirmed that the corrosion rates of Mg-5Y-xNd alloys follow the order Mg-5Y-0.5Nd > Mg- 5Y-1.0Nd > Mg-5Y-1.5Nd. This phenomenon occurred because the Mg3(Y,Nd) precipitated phase with a face-centered cubic lattice had a more positive potential than the Mg12(Y,Nd) phase with an orthorhombic lattice. Thus, the Mg3(Y,Nd) precipitated phase acted as the cathode of the electrochemical reaction, and accelerated the corrosion of the Mg matrix more effectively than the Mg12(Y,Nd) phase.
机译：研究Mg-5Y-XND合金（x = 0.5,1.0,1.5重量％），揭示沉淀相对耐腐蚀性的影响。通过扫描电子显微镜，能量分散光谱仪和X射线衍射分析不同样品的微观结构，沉淀相和腐蚀行为。 Mg12（Y，Nd）相的体积分数增加，而Mg3（Y，Nd）相的相位随ND含量的增加而降低。减肥率从10.9584mg·cm-2·d-1（23.0126mm·y-1）降至6.2184mg·cm-2·d-1（13.0586mm·y-1）。开路电位，电位动力学偏振曲线，电化学阻抗分光镜和扫描塞尔文探针证实，Mg-5Y-XND合金的腐蚀速率遵循Mg-5Y-0.5nd> Mg-5Y-1.0nd> Mg-5Y-1.5 n这种现象发生，因为Mg3（Y，Nd）与面心立的立方晶格的沉淀相比具有与正交晶格的Mg12（Y，Nd）相具有更高的潜在电位。因此，Mg3（Y，Nd）沉淀相用作电化学反应的阴极，并使Mg基质的腐蚀更有效地比Mg12（Y，Nd）相更有效地加速。

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