Effect of chloride ions on the corrosion behaviour of steel in 0.1 M citrate
作者： Hamdy H. Hassan
DOI: 10.1016/J.ELECTACTA.2005.05.011
关键词: Concentration effect 、 Aqueous solution 、 Nucleation 、 Chemistry 、 Chloride 、 Inorganic chemistry 、 Pitting corrosion 、 Oxygen evolution 、 Polarization (electrochemistry) 、 Corrosion
摘要: Abstract The corrosion behaviour of steel was studied in aerated near neutral citrate solutions without and with various concentrations NaCl. potentiodynamic anodic polarization curve 0.1 M solution exhibits four peaks A1, A2, A3 A4 prior to the oxygen evolution reaction. Addition Cl− ions enhances currents, specially A3, which is followed by pitting corrosion. negative going scans cyclic voltammograms show two reactivation A5 A6 one cathodic plateau P1. A diffusion controlled process potential range A2 P1 detected RDE experiments. potentiostatic current time transients, at different NaCl applied potentials Ea > A3, were studied. pit nucleation rate (ti−1) found increase increasing concentration potential. impedance spectra exhibit behaviours depending on used. They fitted a single constant circuit Ea −480 mV, second semicircle replaced resistance disappeared Ea > −300 mV. electrode decrease
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