caa a22 4500 477051995 CHVBK 20180405111341.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF00243742 doi (NATIONALLICENCE)springer-10.1007/BF00243742 Impedance study of the passive film on stainless steel 304 in pH 8 carbonate solution [Elektronische Daten] [M. DRogowska, H. Ménard, A. Lasia, L. Brossard] The effects of applied d.c. potential and polarization time on the passivation of stainless steel 304 (SS304) were investigated in deaerated 1 M NaHCo3 aqueous solutions at pH 8. Electrochemical impedance spectroscopy was used in conjunction with a rotating disc electrode. The data were analysed by considering an equivalent circuit. The changes in impedance parameters at applied d.c. potential signal changes in the properties of passive films on SS304 and allow to distinguish the parameters at low potential (−0.6 to 0.3 V vs SCE) from a different one at high potential (0.5 to 0.8 V vs SCE). The oxidation reactions were controlled by both charge transfer and mass transfer processes. Diffusional resistance was high for both passive films and was considered to represent the resistance to movement of ions or vacancies through the surface layer of oxide films. It is deduced that the passive film present in the low potential region is partially dissolved at 0.4 V vs SCE and that a new passive film is formed in the higher potential region. The equivalent circuit used to obtain the best fit and the fitting parameters was dependent on the electrode potential and the polarization time. The reproducibility of the impedance spectra at constant potentials demonstrate that the passive film formation is highly irreversible process. No traces of localized corrosion were detected but, for a high potential and long polarization time, the electrode surface coloration to a uniform gold colour confirms the film thickening. Chapman & Hall, 1996 DRogowska M. Département de Chimie, Université de Sherbrooke, J1K 2R1, Sherbrooke, Québec, Canada aut Ménard H. Département de Chimie, Université de Sherbrooke, J1K 2R1, Sherbrooke, Québec, Canada aut Lasia A. Département de Chimie, Université de Sherbrooke, J1K 2R1, Sherbrooke, Québec, Canada aut Brossard L. Institut de recherche d'Hydro-Québec (IREQ), J3X 1S1, Varennes, Québec, Canada aut Journal of Applied Electrochemistry Kluwer Academic Publishers 26/11(1996-11-01), 1169-1177 0021-891X 26:11<1169 1996 26 10800 https://doi.org/10.1007/BF00243742 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00243742 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- DRogowska M. Département de Chimie, Université de Sherbrooke, J1K 2R1, Sherbrooke, Québec, Canada aut NATIONALLICENCE 700 1- Ménard H. Département de Chimie, Université de Sherbrooke, J1K 2R1, Sherbrooke, Québec, Canada aut NATIONALLICENCE 700 1- Lasia A. Département de Chimie, Université de Sherbrooke, J1K 2R1, Sherbrooke, Québec, Canada aut NATIONALLICENCE 700 1- Brossard L. Institut de recherche d'Hydro-Québec (IREQ), J3X 1S1, Varennes, Québec, Canada aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 26/11(1996-11-01), 1169-1177 0021-891X 26:11<1169 1996 26 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer