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<p>Electrochemical behavior of as-cast and nanostructured Co<sub>77</sub>Si<sub>11</sub>B<sub>12</sub>, Co<sub>72</sub>Fe<sub>5</sub>Si<sub>11</sub>B<sub>12</sub>, Co<sub>68</sub>Cr<sub>9</sub>Si<sub>11</sub>B<sub>12</sub>, and Co<sub>72</sub>Fe<sub>2.5</sub>Cr<sub>2.5</sub>Si<sub>11</sub>B<sub>12</sub> alloys in a&#xa0;1 M KOH solution was investigated. Alloying with chromium shifts the corrosion potential to −0.43 V and increases the corrosion current density to 1.03 × 10<sup>−2</sup> mA/cm<sup>2</sup>. The Cr-containing alloy exhibits a&#xa0;two-order decrease in corrosion current due to the formation of stable oxide films after annealing. Scanning electron microscopy (SEM) and energy-dispersive analysis (EDX) confirmed surface enrichment with oxygen and chromium, indicating the formation of a&#xa0;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 behavior of the Co<sub>72</sub>Fe<sub>2.5</sub>Cr<sub>2.5</sub>Si<sub>11</sub>B<sub>12</sub> alloy is similar to the base composition of the Co<sub>77</sub>Si<sub>11</sub>B<sub>12</sub> alloy.</p>

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

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • M. M. Lopachak,
  • L. M. Boichyshyn

摘要

Electrochemical behavior of as-cast and nanostructured Co77Si11B12, Co72Fe5Si11B12, Co68Cr9Si11B12, and Co72Fe2.5Cr2.5Si11B12 alloys in a 1 M KOH solution was investigated. Alloying with chromium shifts the corrosion potential to −0.43 V and increases the corrosion current density to 1.03 × 10−2 mA/cm2. The Cr-containing alloy exhibits a two-order decrease in corrosion current due to the formation of stable oxide films after annealing. Scanning electron microscopy (SEM) and energy-dispersive analysis (EDX) 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 behavior of the Co72Fe2.5Cr2.5Si11B12 alloy is similar to the base composition of the Co77Si11B12 alloy.