Growth kinetics of anodic oxide layers on cobalt silicides in sulphuric acid solutions

Keywords: Cobalt silicide, Passivity, Oxide film, Growth kinetics, High field model, Point defect model

Abstract

        The aim of this research was to study the growth kinetics of anodic oxide films on cobalt silicides in sulphuric acid solutions under potentiostatic conditions with various pretreatment of the electrode surface. For the study, we used low and high silicon silicides (Co2Si and CoSi2) in 0.05 and 0.5 M H2SO4.
        We obtained the chronoamperograms in the time interval t = 0.3–3000 s with the oxide formation potentials of Ef = 0.2, 0.5, and 1.0 V (SHE). It was determined that the kinetics of the growth of oxide layers on cobalt silicides in acidic solutions greatly depends on the method of the silicide surface pretreatment (mechanical polishing; cathodic pre-polarisation in a H2SO4 solution; exposure to H2SO4 solution at the open circuit potential; exposure in a 2 M KOH solution; and exposure to 2% HF solution). In most cases, at low t (up to 30–50 s), the oxide films grew due to the ion migration in the strong electric field generated in the film during anodic polarisation.
         In some cases (Co2Si silicide with higher cobalt content; pretreatment of Co2Si in alkaline solution, further enriching the silicide surface with cobalt; and the region of high values of t), the point defect model seemed to be executed. 

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Author Biographies

Anatoliy B. Shein, Perm State National Research University, 15 Bukireva ul., Perm 614990, Russian Federation

Dr. Sci. (Chem.), Full Professor,
the Department of Physical Chemistry, Perm State
University (Perm, Russian Federation)

Vladimir I. Kichigin, Perm State National Research University, 15 Bukireva ul., Perm 614990, Russian Federation

Cand. Sci. (Chem.), Research
Fellow at the Department of Physical Chemistry, Perm
State University (Perm, Russian Federation)

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Published
2022-11-01
How to Cite
Shein, A. B., & Kichigin, V. I. (2022). Growth kinetics of anodic oxide layers on cobalt silicides in sulphuric acid solutions. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 24(4), 559-571. https://doi.org/10.17308/kcmf.2022.24/10560
Section
Original articles