caa a22 4500 475816471 CHVBK 20180406123811.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1023/A:1026560422090 doi (NATIONALLICENCE)springer-10.1023/A:1026560422090 Electrochemical and XPS investigations of cobalt in KOH solutions [Elektronische Daten] [K.M. Ismail, W.A. Badawy] The electrochemical behaviour of cobalt in KOH solutions of different concentrations was studied. The effects of applied potential, temperature and the presence of aggressive Cl− ions were investigated. Different electrochemical methods such as open-circuit potential measurements, polarisation techniques and electrochemical impedance spectroscopy (EIS) were used. The electrochemical behaviour of cobalt in naturally aerated KOH solutions is characterized by three different regions according to the alkali concentration. Corrosion behaviour was observed at high concentrations (0.3-1.0 M); passivation at lower concentrations (0.01-0.05 M), and at intermediate concentrations (0.1-0.2 M) corrosion followed by passivation was recorded. The corrosion parameters (i corr, E corr, and R corr) under various conditions were calculated. Equivalent-circuit models for the electrode-electrolyte interface under different conditions were proposed. The experimental impedance data were fitted to theoretical data according to the proposed models. The relevance of the proposed models to the corrosion-passivation phenomena occurring at the electrode-solution interface was discussed. The electrochemical experimental results and discussions were supported by surface analytical techniques. Kluwer Academic Publishers, 2000 cobalt nationallicence EIS nationallicence passivation nationallicence pitting nationallicence polarization nationallicence XPS nationallicence Ismail K.M. Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt aut Badawy W.A. Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/11(2000-11-01), 1303-1311 0021-891X 30:11<1303 2000 30 10800 https://doi.org/10.1023/A:1026560422090 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1026560422090 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ismail K.M. Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt aut NATIONALLICENCE 700 1- Badawy W.A. Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/11(2000-11-01), 1303-1311 0021-891X 30:11<1303 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer