Influence of alloying elements on the electrochemical behaviour of cobalt Co–Si–B–Fe–Cr amorphous-nanocrystalline alloys in a 1 M OH solution

Keywords

amorphous alloys, nanocrystalline structure, cobalt, corrosion, passivation.

Cite as

Lopachak M. M. and Boichyshyn L. M. Influence of alloying elements on the electrochemical behaviour of cobalt Co–Si–B–Fe–Cr amorphous-nanocrystalline alloys in a 1 M OH solution. Physicochemical Mechanics of Materials. 2025. 61(6), 27-32.

https://doi.org/10.15407/pcmm2025.06.027

Abstract

Electrochemical behavior of as-cast and nanostructured alloys Co₇₇Si₁₁B₁₂, Co₇₂Fe₅Si₁₁B₁₂, Co₆₈Cr₉Si₁₁B₁₂, and Co₇₂Fe_2,5Cr_2,5Si₁₁B₁₂ in 1 M KOH solution was investigated. It was found that alloying with chromium shifts the corrosion potential to –0.43 V and increases the corrosion current density up to 1,03×10^–2 mA/cm². After annealing, the Cr-containing alloy exhibits a two-order decrease in corrosion current due to the formation of stable oxide films. SEM and EDX analyses confirmed surface enrichment with oxygen and chromium, indicating the formation of a protective layer. The addition of iron shifts the corrosion potential to –0.75 V; however, nanostructuring reduces the electrochemical activity and enhances surface passivation. The Co₇₂Fe_2,5Cr_2,5Si₁₁B₁₂ alloy behavior is simi­lar to the base composition Co₇₇Si₁₁B₁₂.

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