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Bojinov Martin Betova Iva Karastoyanov Vasil 《Journal of Solid State Electrochemistry》2023,27(7):1835-1846
Journal of Solid State Electrochemistry - Anodic film growth on a Ti alloy in water-containing ethylene glycol electrolyte with addition of fluoride... 相似文献
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The anodic oxidation of tungsten has been studied in 1 M Na2SO4 solutions containing 0–0.25 M NaF. Steady-state currents measured in the passivation and passivity ranges increase significantly
with increasing fluoride concentration, indicating enhanced dissolution of the oxide film. The electrochemical impedance response
is dominated by the processes in the barrier layer and at its interface with the electrolyte. The presence of a pseudo-inductive
loop in the impedance spectra at intermediate frequencies indicates point defect interaction during film growth and dissolution
processes. A kinetic model including the recombination reaction between oppositely charged point defects at the film/solution
interface as well as a kinetic scheme for tungsten dissolution through the film mediated by cation vacancies is proposed.
It is found to reproduce satisfactorily the steady-state currents and the impedance spectra in the potential range 0.2–2 V.
Such a model for the conduction mechanism in the barrier layer is believed to be an essential part of a modelling approach
to the formation of a nanoporous overlayer on tungsten in fluoride-containing solutions. 相似文献
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