The influence of composition of amorphous alloys on their corrosion resistance in aggressive environments of different nature

Keywords

amorphous metallic alloys, corrosion resistance, electrochemical characteristics.

Cite as

Hertsyk O. М., Hula Т. H., Yezerska О. А., Nosenko V. K., Korniy S. А., and Таshak М. S. The influence of composition of amorphous alloys on their corrosion resistance in aggressive environments of different nature. Physicochemical Mechanics of Materials. 2023. 59(5), 32-38.

https://doi.org/10.15407/pcmm2023.05.032

Abstract

The influence of the elemental composition of strip amorphous alloys Fe_80.0Si_6.0B_14.0, Fe_78.5Ni_1.0Mo_0.5Si_6.0B_14.0; Fe_73.1Cu_1.0Nb_3.0Si_15.5B_7.4; Fe_51.7Ni_21.7Cr_6.2Mo_0.6V_1.5Si_5.2B_13.1 on corrosion resistance in 0.5 M aqueous solutions of NaCl, HCl, and KOH at T = (293±1) K was investigated. The high corrosion resistance of Fe_51.7Ni_21.7Cr_6.2Mo_0.6V_1.5Si_5.2B_13.1 and Fe_73.1Cu_1.0Nb_3.0Si_15.5B_7.4 alloys in aggressive environments was established. Electrochemical parameters obtained both by the method of cyclic voltammetry and electrochemical impedance spectroscopy (EIS) indicate the formation of more durable surface layers in a 0.5 M potassium hydroxide aqueous solution on these alloys. The  ions (especially at low pH) under their long-term action are the more aggressive oxidizers of amorphous alloys compared to  ions. During the passivation film formation in highly aggressive environments such alloy elements, which do not participate in this process, actively dissolve, and the main film-forming elements accumulate under the film, thus improving its protective properties.

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