Influence of Alloying on the Corrosion Resistance of Bulk Amorphous Alloys Based on Iron
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INFLUENCE OF ALLOYING ON THE CORROSION RESISTANCE OF BULK AMORPHOUS ALLOYS BASED ON IRON O. M. Hertsyk,1 M. O. Kovbuz,1 L. M. Boichyshyn,1, 2 T. G. Pereverzeva,1 and O. V. Reshentyak1 By the methods of chronopotentiometry and cyclic voltammetry, we study the electrochemical characteristics of Fe 65.58Cr7.92 Mn1.98 Mo 3.96V0.1Cu 0.05 W0.01Ti 0.06C 4.69Si 2.85 B5.94 P6.93 , Fe 64.38Cr4.5 Mo 4V0.1 C 5 P7 B10Si 2.87 , and Fe 68.93Cr2 Mo 4 Mn(Cu, W, Al)0.07 C 7 P10 B5Si 2 bulk amorphous metallic alloys in 0.5 M aqueous solutions of sodium chloride, potassium hydroxide, and hydrochloric acid. It is shown that the surfaces of the alloys in the indicated aggressive aqueous solutions are characterized by high corrosion resistances. As temperature increases, the corrosion resistance decreases in the solutions of sodium chloride and potassium hydroxide but remains practically invariable in hydrochloric acid. Keywords: bulk amorphous metal alloys, corrosion resistance, activation energy.
The discovery of numerous earlier unknown dependences between the compositions and structures of multicomponent metallic systems makes if possible to create bulk amorphous alloys (BAA) of a new generation that belong to the "intermetallic compound– intermetallic compound" class and to extend the field of targeted applications of amorphous metallic materials [1]. Most of these alloys are characterized by the high chemical resistance and are suitable for the operation in aggressive media. Their corrosion resistance is guaranteed by the element composition and the absence of structural defects, i.e., by a high degree of homogeneity. An especially high resistance to the oxidation dissolution is exhibited by amorphous alloys based on Fe, Ni, and Co containing both metalloids, such as P, C, Si, and B, and alloying admixtures (Cr, Mo, W, and V) [2–4]. The addition of small amounts of rare-earth elements (Y, Er, and Dy) favors their amorphization [5]. Since the discovery of BAA, the main attention of the researchers is focused on the creation of new multicomponent alloys with given composition and high electric, mechanical, and refractory characteristics. The products made of these alloys operate, as a rule, in aggressive media (gaseous and liquid). Therefore, it is of high importance to study their corrosion resistance by the electrochemical methods with an aim to predict their operating characteristics. Method of Investigations We studied the following amorphous metallic alloys based on iron in the form of bars: NVRS-2 ( Fe 65.58Cr7.92 Mn1.98 Mo 3.96V0.1Cu 0.05 W0.01Ti 0.06C 4.69Si 2.85 B5.94 P6.93 ), NVRS-3 ( Fe 64.38Cr4.5 Mo 4 Mn 2Cu 0.05V0.1C 5 P7 B10Si 2.87 ), 1 2
I. Franko Lviv National University, Lviv, Ukraine.
Corresponding author; e-mail: [email protected].
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 53, No. 3, pp. 37–42, May–June, 2017. Original article submitted October 6, 2016. 330
1068-820X/17/5303–0330
© 2017
Springer Science+Business Media New York
INFLUENCE OF ALLOYING ON THE CORROSION RESISTANCE OF BULK AM
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