Insight into physical interpretation of high frequency time constant in electrochemical impedance spectra of Mg

By Linqian Wang, D. Snihirova, Min Deng, Cheng Wang, B. Vaghefinazari, Gert Wiese, Mark Langridge, D. Höche, Sviatlana V. Lamaka, M. Zheludkevich. Corrosion Science, 2021

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Abstract Electrochemical impedance spectroscopy measurements were performed to study the evolution of surface condition and relate this to the high frequency time constant of Mg in 0.05 M NaCl solution at three different pH. Based on the assumption that the high frequency time constant originates solely from the surface film, the thickness of MgO film was calculated via fitting EIS results. The deduced results were compared with the actual surface condition, characterized by transmission electron microscopy and local measurements. The results verified that the time constant at the high frequency range originates from the barrier properties of the surface film.

Subfields: Biomaterials, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/d4bf3b62c0a122a4ad8d1b229e5aa0f515679882