Abstract

A corrosion study of high purity magnesium in two simulated physiological solutions (Ringer’s solution and Hank’s solution) is reported. The electrochemical behavior of pure magnesium rotating disc electrode (RDE) was examined using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques. The rotation affects the potentiodynamic polarisation curves and makes a shift in the anodic branches because of the dissolution of the corrosion layer. The EIS results showed the presence of three-time constant attributed to formation of the protective film on the Mg surface, the faradic process and the adsorption phenomena. The formation of a compact layer on magnesium surface, offers a higher corrosion protective ability for Mg. The thickness of this layer increase subsequently with increase in immersion time. The magnesium surface morphology was characterized by scanning electron microscopy (SEM). The composition and the microstructure of the corrosion product film were carried out using X-ray photoelectric spectroscopy (XPS) and X-ray diffraction (XRD). Brucite, calcite and magnesium calcite were detected in both medium, while aggregated particles containing a high concentration of phosphorus were formed on Mg in Hunk’s solution.

中文翻译：

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林格溶液和汉克溶液中纯镁行为的比较电化学研究

摘要

报道了在两种模拟的生理溶液（林格氏溶液和汉克氏溶液）中对高纯度镁的腐蚀研究。使用电化学阻抗谱（EIS）和电位动力学极化（PDP）技术检查了纯镁转盘电极（RDE）的电化学行为。旋转会影响电位动力学极化曲线，并由于腐蚀层的溶解而使阳极分支发生位移。EIS结果表明存在三倍常数，这归因于在镁表面上形成保护膜，法拉第过程和吸附现象。在镁表面形成致密层，为镁提供了更高的腐蚀防护能力。随后，该层的厚度随着浸入时间的增加而增加。通过扫描电子显微镜（SEM）表征镁的表面形态。腐蚀产物膜的组成和微观结构使用X射线光电光谱（XPS）和X射线衍射（XRD）进行。在两种介质中均检测到水镁石，方解石和方解石镁，而在Hunk's溶液中的Mg上形成了含有高浓度磷的聚集颗粒。