caa a22 4500 475815025 CHVBK 20180406123807.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1023/A:1004034418431 doi (NATIONALLICENCE)springer-10.1023/A:1004034418431 Dynamic aspects of the electroreduction of chromic acid solutions [Elektronische Daten] [E. Soragni, C. Fontanesi, G. Barani, V. Ganzerli] 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: CrO3 250 g dm−3, H2SO4 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. Kluwer Academic Publishers, 2000 chromium nationallicence electrodeposition nationallicence impedance nationallicence oscillating reaction nationallicence Soragni E. Department of Chemistry, University of Modena, Via Campi 183, 41100, Modena, Italy aut Fontanesi C. Department of Chemistry, University of Modena, Via Campi 183, 41100, Modena, Italy aut Barani G. Department of Chemistry, University of Modena, Via Campi 183, 41100, Modena, Italy aut Ganzerli V. Oleo Component System O.C.S. s.r.l, Via Salvemini 26, 41100, Modena, Italy aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/9(2000-09-01), 1069-1079 0021-891X 30:9<1069 2000 30 10800 https://doi.org/10.1023/A:1004034418431 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1004034418431 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Soragni E. Department of Chemistry, University of Modena, Via Campi 183, 41100, Modena, Italy aut NATIONALLICENCE 700 1- Fontanesi C. Department of Chemistry, University of Modena, Via Campi 183, 41100, Modena, Italy aut NATIONALLICENCE 700 1- Barani G. Department of Chemistry, University of Modena, Via Campi 183, 41100, Modena, Italy aut NATIONALLICENCE 700 1- Ganzerli V. Oleo Component System O.C.S. s.r.l, Via Salvemini 26, 41100, Modena, Italy aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/9(2000-09-01), 1069-1079 0021-891X 30:9<1069 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer