Influence of Cr on the electronic properties of passive film on B30 alloy in NaOH solution

Abstract

The influence of Cr on the electronic properties of the passive film on B30 alloy in NaOH solution was studied via electrochemical impedance spectra(EIS), potentiodynamic curve and Mott-Schottky plot. The Cr doped in the passive film on B30 alloy was detected by X-ray photoelectron spectroscopy(XPS). XPS results show that Cr₂O₃ appeared on the passive film, which implied the enhanced anti-corrosion of B30 alloy. The passive film showed a p-type semi-conductive character. The acceptor density(NA) was in an order of magnitude of 10²² cm⁻³, and N _A decreased with the increment of Cr. EIS results show that the film resistance(R _f) increased with increasing the amount of Cr. The diffusion coefficient(D ₀) was calculated to be in a range of 10⁻¹⁶−10⁻¹⁷ cm⁻²/s on the basement of point defect model(PDM).

Keywords

Electrochemcal impedance spectrum / X-Ray photoelectron spectroscopy / Passive film

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