caa a22 4500 477051448 CHVBK 20180405111340.0 cr unu---uuuuu 170330e19960201xx s 000 0 eng 10.1007/BF00364073 doi (NATIONALLICENCE)springer-10.1007/BF00364073 Electrooxidation of stainless steel AISI 304 in carbonate aqueous solution at pH 8 [Elektronische Daten] [M. Drogowska, H. Ménard, L. Brossard] The electrochemical behaviour of stainless steel AISI 304 (SS304) has been investigated in deaerated 0.1-1 m NaHCO3 solutions at pH 8 using a rotating disc electrode. The polarization curves are characterized by a broad range of passivity at low potentials (−0.8 to 0.3 V), a depassivation region at 0.4 V vs SCE and, at high potentials (0.5 to 0.85 V), a passive region before oxygen evolution. In the low potential range, the SS304 electrode behaves like a Cr-rich metallic phase, and the dissolution of Fe2+ ions into the solution is hindered by the formation of a Cr2O3 layer. As the potential reaches 0.4V, the oxidation-dissolution of Cr(iii) oxide/hydroxide to CrO4 2 ions occurs, with the participation of bicarbonate/carbonate as a catalyst in the dissolution reaction. Since the chromium oxide/hydroxide dissolution and subsequent surface enrichment of iron oxides occur, the applied potential, exposure time and oxidation charge have a considerable effect on the passive film properties. At high potentials, the presence of a passive film of iron oxides/hydroxides or oxyhydroxides plays a key role in the SS304 passivity with the presence of Fe(vi) species incorporated or adsorbed into the passive films. Colouration of the SS304 surface is observed in the second passive region. A film of a uniform gold colour formed on SS304, mild steel 1024 and iron in carbonate and borate solutions at pH 8. The colour of the electrode surfaces remain unchanged in air and in solutions at positive potential but it disappears at open-circuit potential or is easily reduced in the first negative-going potential scan. Chapman & Hall, 1996 Drogowska M. Département de Chimie, Universite de Sherbrooke, J1K 2R1, Sherbrooke, Quebec, Canada aut Ménard H. Département de Chimie, Universite de Sherbrooke, J1K 2R1, Sherbrooke, Quebec, Canada aut Brossard L. Institut de Recherche d'Hydro-Quebec (IREQ), J3X 1S1, Varennes, Quebec, Canada aut Journal of Applied Electrochemistry Kluwer Academic Publishers 26/2(1996-02-01), 217-225 0021-891X 26:2<217 1996 26 10800 https://doi.org/10.1007/BF00364073 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00364073 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Drogowska M. Département de Chimie, Universite de Sherbrooke, J1K 2R1, Sherbrooke, Quebec, Canada aut NATIONALLICENCE 700 1- Ménard H. Département de Chimie, Universite de Sherbrooke, J1K 2R1, Sherbrooke, Quebec, Canada aut NATIONALLICENCE 700 1- Brossard L. Institut de Recherche d'Hydro-Quebec (IREQ), J3X 1S1, Varennes, Quebec, Canada aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 26/2(1996-02-01), 217-225 0021-891X 26:2<217 1996 26 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer