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Corrosion-Free EMF Measurements of Zinc-Based Intermetallic Compounds at Ambient Temperature.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-04-07 , DOI: 10.1002/cphc.201901218 René Kriegel 1 , Marc Armbrüster 1
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-04-07 , DOI: 10.1002/cphc.201901218 René Kriegel 1 , Marc Armbrüster 1
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Material development requires in many cases information about the necessary stability of the materials against oxidation, which is encoded in the chemical activity of the constituting elements. Determination of the chemical activity is tedious, especially for metallic materials at or close to ambient temperature. To determine the chemical activity of Zn at ambient temperature, electromotive force (EMF) measurements on the intermetallic compounds ZnPd, ZnPt and Cu5Zn8 within their respective homogeneity range were conducted. The single‐phase nature of the samples was confirmed by powder X‐ray diffraction, light microscopy as well as SEM/EDX analysis. To exclude oxidation, and therefore faulty determination of the electrochemical potentials, a method was developed to conduct the electrochemical measurements under non‐corrosive conditions in inert atmosphere. Corrosion by the electrolyte was avoided using anhydrous dimethylformamide as aprotic solvent. From the EMF the respective intrinsic activities of zinc in the corresponding intermetallic compounds was determined. Measurements on Cu5Zn8 and comparison to available data in literature verified the developed method allowing to retrieve thermodynamic data of ZnPd and ZnPt for the first time at ambient temperature. The herein developed and easy‐to‐use methodology is applicable to a wide range of metallic material by choosing appropriate compositions of the electrolyte and has the potential to boost material development.
中文翻译：
锌基金属间化合物在环境温度下的无腐蚀EMF测量。
在许多情况下，材料开发需要有关材料抗氧化的必要稳定性的信息，该信息编码在构成元素的化学活性中。化学活性的测定是繁琐的，尤其是对于环境温度或接近环境温度的金属材料而言。要确定环境温度下Zn的化学活性，需要对金属间化合物ZnPd，ZnPt和Cu 5 Zn 8进行电动势（EMF）测量在它们各自的均质范围内进行。粉末X射线衍射，光学显微镜以及SEM / EDX分析证实了样品的单相性质。为了排除氧化，因此无法确定电化学电势，开发了一种在惰性气氛中在非腐蚀性条件下进行电化学测量的方法。使用无水二甲基甲酰胺作为非质子传递溶剂可避免电解质腐蚀。根据EMF，确定了相应金属间化合物中锌的各自固有活性。Cu 5 Zn 8的测量并与文献中的可用数据进行比较，验证了该开发的方法允许首次在环境温度下检索ZnPd和ZnPt的热力学数据。通过选择合适的电解质成分，本文开发的易于使用的方法论可适用于多种金属材料，并具有促进材料开发的潜力。
更新日期：2020-04-07
中文翻译：
锌基金属间化合物在环境温度下的无腐蚀EMF测量。
在许多情况下，材料开发需要有关材料抗氧化的必要稳定性的信息，该信息编码在构成元素的化学活性中。化学活性的测定是繁琐的，尤其是对于环境温度或接近环境温度的金属材料而言。要确定环境温度下Zn的化学活性，需要对金属间化合物ZnPd，ZnPt和Cu 5 Zn 8进行电动势（EMF）测量在它们各自的均质范围内进行。粉末X射线衍射，光学显微镜以及SEM / EDX分析证实了样品的单相性质。为了排除氧化，因此无法确定电化学电势，开发了一种在惰性气氛中在非腐蚀性条件下进行电化学测量的方法。使用无水二甲基甲酰胺作为非质子传递溶剂可避免电解质腐蚀。根据EMF，确定了相应金属间化合物中锌的各自固有活性。Cu 5 Zn 8的测量并与文献中的可用数据进行比较，验证了该开发的方法允许首次在环境温度下检索ZnPd和ZnPt的热力学数据。通过选择合适的电解质成分，本文开发的易于使用的方法论可适用于多种金属材料，并具有促进材料开发的潜力。
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