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首页> 外文期刊>Journal of Materials Engineering and Performance >Electrochemical Behavior Assessment of As-Cast Mg-Y-RE-Zr Alloy in Phosphate Buffer Solutions (X Na3PO4 + Y Na2HPO4) Using Electrochemical Impedance Spectroscopy and Mott-Schottky Techniques
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Electrochemical Behavior Assessment of As-Cast Mg-Y-RE-Zr Alloy in Phosphate Buffer Solutions (X Na3PO4 + Y Na2HPO4) Using Electrochemical Impedance Spectroscopy and Mott-Schottky Techniques

机译：磷酸盐缓冲溶液（X Na3PO4 + Y Na2HPO4）中磷酸盐缓冲溶液（X Na3PO4 + Y Na2HPO4）的电化学行为评估

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摘要

In the present study, electrochemical behavior of as-cast Mg-Y-RE-Zr alloy (RE: rare-earth alloying elements) was investigated using electrochemical tests in phosphate buffer solutions (X Na3PO4 + Y Na2HPO4). X-ray diffraction techniques and Scanning electron microscopy equipped with energy dispersive x-ray spectroscopy were used to investigate the microstructure and phases of the experimental alloy. Different electrochemical tests such as potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS) and Mott-Schottky (M-S) analysis were carried out in order to study the electrochemical behavior of the experimental alloy in phosphate buffer solutions. The PDP curves and EIS measurements indicated that the passive behavior of the as-cast Mg-Y-RE-Zr alloy in phosphate buffer solutions was weakened by an increase in the pH, which is related to formation of an imperfect and less protective passive layer on the alloy surface. The presence of the insoluble zirconium particles along with high number of intermetallic phases of RE elements mainly Mg24Y5 in the magnesium matrix can deteriorate the corrosion performance of the alloy by disrupting the protective passive layer that is formed at pH values over 11. These insoluble zirconium particles embedded in the matrix can detrimentally influence the passivation. The M-S analysis revealed that the formed passive layers on Mg-Y-RE-Zr alloy behaved as an n-type semiconductor. An increase in donor concentration accompanying solutions of higher alkalinity is thought to result in the formation of a less resistive passive layer.
机译：在本研究中，使用磷酸盐缓冲溶液中的电化学试验研究了AS铸造Mg-Y-Re-Zr合金（Re：稀土合金元素）的电化学行为（X Na 3PO4 + Y Na 2 HPO 4）。使用配备能量分散X射线光谱的X射线衍射技术和扫描电子显微镜研究实验合金的微观结构和相。进行不同的电化学测试，例如电位动力学偏振（PDP），电化学阻抗光谱（EIS）和MOTT-SCHOTTKY（M-S）分析，以研究实验合金在磷酸盐缓冲溶液中的电化学行为。 PDP曲线和EIS测量表明，通过增加磷酸盐缓冲溶液中的磷酸盐缓冲溶液中的磷酸盐Mg-Y-Re-Zr合金的被动性能，其与形成不完美和更少的保护性无源层有关在合金表面上。不溶性锆颗粒的存在以及在镁基质中主要Mg24Y5的Re元素的大量金属间相可以通过破坏在pH值超过11的pH值以上形成的保护无源层来劣化合金的腐蚀性性能。这些不溶性锆颗粒嵌入矩阵中的嵌入可能会对钝化作出不利影响。 M-S分析表明，Mg-Y-Re-Zr合金上的形成无源层表现为N型半导体。据认为，伴随较高碱度溶液的供体浓度的增加导致形成较低的电阻无源层。

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