Electrochemical Properties of Ternary Amorphous Alloys Based on Iron and Cobalt in Alkali Solutions
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ELECTROCHEMICAL PROPERTIES OF TERNARY AMORPHOUS ALLOYS BASED ON IRON AND COBALT IN ALKALI SOLUTIONS L. M. Boichyshyn,1 О. М. Hertsyk,1,2 М. М. Lopachak,1 М. О. Kovbuz,1 Т. H. Hula,1 and N. L. Pandyak3 We study the electrochemical behavior of Fe 80Si 6 B14 , Co 72Si18 B10 , and Fe 84 Nb 2 B14 amorphous metal alloys based on Fe and Сo in alkali solutions of different concentrations. The protective oxide layers on Fe 80Si 6 B14 electrodes have lower degrees of corrosion protection than for the Co 72Si18 B10 electrodes. Niobium clusters in the Fe 84 Nb 2 B14 alloy are reactive, which results in the rapid initial interaction of the electrode with a 1 М aqueous solution of KОН, which is retarded under the conditions of long-term contact with ions of the electrolyte. The Fe 80Si 6 B14 and Fe 84 Nb 2 B14 alloys are characterized by a similar electrochemical behavior in 1 M and 5 М aqueous solution of KOH under the conditions of cyclic polarization of samples in corrosive media. As a result of fivefold scanning of the potential, it is shown that the electrochemical properties of the electrodes made of amorphous metallic alloys depend on the electrolyte concentration. Keywords: amorphous alloys, electrochemical properties, cyclic polarization, alkali solutions, Tafel constants.
Introduction The analysis of the relationship between the structure and physicochemical properties of amorphous metallic alloys (AMA) based on the characteristics of individual atoms of their components is a promising direction in the investigation of metal compositions [1]. Phase transformations prove to be one of known methods used for the purposeful modification of АМA [2]. Starting from the period of superfast cooling of the melt (SFCM), we observe the formation of nonequilibrium structured phases characterized by a series of unique properties. However, the problem of prediction of the properties of АМA is complicated by the technology of their manufacturing, the heterophase state formed after solidification, and the shape of the product (strip, threedimensional, or film) [3]. Corrosion processes occur on the “metal surface–corrosive medium” interface. Thus, the corrosion activity is determined by the composition and structure of the surface layers of АМA, which have properties different from the bulk properties of the alloy [4]. The aim of the present work is to study the electrochemical characteristics of amorphous alloys based on Fe and Co in alkali solutions. Experimental Part Amorphous and nanostructured alloys based on Fe and Co, namely, Fe 80Si 6 B14 , Co 72Si18 B10 , and Fe 84 Nb 2 B14 , were obtained by using the SFCM procedure on a copper drum at a rate of cooling of the melt equal 1 2 3
I. Franko Lviv National University, Lviv, Ukraine.
Corresponding author; e-mail: [email protected].
Ukrainian National Forestry University, Lviv, Ukraine.
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 55, No. 5, pp. 84–89, September–October, 2019. Original article submitted April 17, 2019. 1068-820X/20/5505–0703
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