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Corrosion Resistance of Mg72Zn24Ca4 and Zn87Mg9Ca4 Alloys for Application in Medicine

机译:Mg72Zn24Ca4和Zn87mg9ca4合金在医学中应用的耐腐蚀性

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摘要

The aim of this work was to monitor the corrosion rate of the Mg Zn Ca and Zn Mg Ca alloys. The purity of the alloying elements was 99.9%. The melt process was carried out in an induction furnace. The melting process took place under the cover of an inert gas (argon). The copper form was flooded by liquid alloy. Then, in order to obtain ribbons, the cast alloy, in rod shape, was re-melted on the melt spinning machine. The corrosion resistance of both alloys has been determined on the basis of the following experiments: measurements of the evolution of OCP (open circuit potential), LSV (linear sweep voltamperometry) and EIS (electrochemical impedance spectroscopy). All corrosion tests were carried out in Ringer’s solution at 37 °C and pH 7.2. The corrosion tests have revealed that the zinc alloy, Zn Mg Ca exhibits significantly higher corrosion resistance in the Ringer solution compared to the magnesium alloy, Mg Zn Ca . Moreover, it has been shown that the cathodic reaction proceeds faster on the surface of ribbons. EIS measurements show that the dissolution of Mg alloy proceeds with two steps: transfer of Mg ions to the Ringer solution and then the formation of the corrosion products, which are deposited on the surface of magnesium alloy. It has been revealed, too, that for both bulk materials, diffusion of chloride ions through the corrosion product’s layer takes place.
机译:这项工作的目的是监测Mg Zn Ca和Zn Mg Ca合金的腐蚀速率。合金元素的纯度为99.9%。熔体过程在感应炉中进行。熔化过程在惰性气体(氩气)的盖下发生。铜形式被液体合金淹没。然后,为了获得带,在焊料纺纱机上重新熔化杆状的铸造合金。已经基于以下实验确定了两种合金的耐腐蚀性:OCP(开路电位),LSV(线性扫描电压型)和EIS(电化学阻抗光谱)的演变的测量。所有腐蚀试验在林格氏溶液中在37°C和pH 7.2中进行。腐蚀试验表明,与镁合金,Mg Zn Ca相比,锌合金,Zn Mg Ca表现出振铃溶液中的耐腐蚀性显着更高。此外,已经表明,阴极反应在丝带表面上更快地进行。 EIS测量表明,Mg合金的溶解与两个步骤进行:将Mg离子转移到林纳溶液中,然后形成腐蚀产物,腐蚀产物沉积在镁合金表面上。它也揭示了,对于散装材料,氯离子通过腐蚀产品层的扩散发生。

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