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Corrosion behavior of Ti3GeC2 and Ti2AlN in 1 m NaOH
Journal article

Corrosion behavior of Ti3GeC2 and Ti2AlN in 1 m NaOH

V. D. Jovic, M. W. Barsoum, B. M. Jovic, A. Ganguly and T. El-Raghy
Journal of the Electrochemical Society, v 153(7), pp B238-B243
01 Jan 2006

Abstract

Electrochemistry Materials Science Materials Science, Coatings & Films Physical Sciences Science & Technology Technology
In this paper we report on the corrosion behavior of Ti3GeC2 and Ti2AlN in a 1 M NaOH solution, investigated by electrochemical impedance spectroscopy (EIS), polarization, and zeta-potential measurements. The EIS results for Ti3GeC2 and some results for Ti2AlN could be fitted to a complex equivalent circuit, where the double layer is represented by a constant phase element. The passive film is represented by a polarization resistance in series with a parallel connection of a resistance of the passive film (R-pf) and its capacitance (C-pf). In both cases passive layers were formed. Based on the zeta-potential measurements, we conclude that the passivating layer that forms on Ti3GeC2, over a wide pH range, is most likely GeO2-based, while the one formed on Ti2AlN is most likely Al2O3-based and/or TiO2-based. (c) 2006 The Electrochemical Society.

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Electrochemistry
Materials Science, Coatings & Films
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