NDLI: Dynamic aspects of the electroreduction of chromic acid solutions

Content Provider	Springer Nature Link
Author	Soragni, E. Fontanesi, C. Barani, G. Ganzerli, V.
Copyright Year	2000
Abstract	Potentiodynamic and impedance spectroscopy measurements were performed on ARMCO iron, steels (C30, C40, C50), cast iron and graphite electrodes in a bath of industrial composition: CrO$_{3}$ 250 g dm$^{−3}$, H$_{2}$SO$_{4}$ 2.5 g dm$^{−3}$. Attention focused on the electrochemical reactions occurring before the start of the chromium deposition. The electrochemical evidence is markedly affected by the chemical nature of the cathode. This is rationalized by proposing a reaction mechanism involving the formation, depending on the chemical nature of the substrate, of a passive adsorbed film consisting of mixed chromium and iron oxides. Moreover, the proposed overall scheme accounts for the presence of periodic current oscillations observed both in potentiodynamic and potentiostatic curves. In close agreement, impedance spectra show negative loops when measured at the corresponding potentials.
Starting Page	1069
Ending Page	1079
Page Count	11
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	30
Issue Number	9
e-ISSN	15728838
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Electrochemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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