Abstract
AbstractCathodic and anodic polarisation plots for the corrosion of pure tin foil and tinplate in deoxygenated aqueous solutions containing various quantities of citric acid, trisodium citrate, and sodium bisulphate have been obtained from potentiodynamic measurements. Open circuit potentials for the corrosion of tin surfaces in such solutions at 25°C become more negative with increasing pH. At sufficiently anodic potentials, in the presence of citrate ions, passivation characteristics were observed in the anodic polarisation plots when a white solid material, probably a tin citrate complex compound, formed on the electrode surface. SEM micrographs of the coated surface indicated that the solid was crystalline in nature. Cathodic Tafel slopes for the hydrogen evolution reaction on tin for the different solutions were determined.
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