Electrochemical properties of thermomodified cobalt amorphic alloys in alkaline media

Keywords

cobalt amorphous alloys, corrosion resistance, temperature modification.

Cite as

Hertsyk О. М., Nosenko A. V., Slobodnyj V. A., Korniy S. A., Pаndiak N. L., and Tashak M. S. Electrochemical properties of thermomodified cobalt amorphic alloys in alkaline media. Physicochemical Mechanics of Materials. 2026. 62(2), 032-039.

https://doi.org/10.15407/pcmm2026.02.032

Abstract

The effect of non-isothermal heating and chemical modification on the structural state and corrosion resistance of amorphous Co₇₂Fe₅Si₁₁B₁₂ and Co₇₀Fe_2.5Cr_4.5Si₁₁B₁₂ cobalt alloys in 1 M aqueous potassium hydroxide solution is investigated. During heating of the Co₇₂Fe₅Si₁₁B₁₂ alloy, significant surface changes occur, in particular the formation of crystalline phases and oxidation, which is accompanied by a decrease in the rate of corrosion pro­cesses. Heat treatment at temperatures of 773–787 K helps to increase the corrosion resistance of the material in an alkaline environment. It is found that the amorphous Co₇₀Fe_2.5Cr_4.5Si₁₁B₁₂ alloy is characterized by higher corrosion resistance compared to the alloy without chromium addition. Thermal modification of the alloy with Cr content causes a shift of corrosion potentials in the positive direction, however it is accompa­nied by an increase in corrosion currents. It is found that increase in the potential sweep rate does not significantly affect the values ​​of corrosion potentials, but leads to an increase in corrosion currents in contact with an aggressive environment.

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