Abstract
The corrosion behaviour of tin in different concentrations of citric acid solutions (0.3–1.0 M, pH=1.8 ) was studied at 30 °C by potentiodynamic technique. The E/ I profiles exhibit an active passive behaviour. The active dissolution involves one anodic peak A associated with a dissolution of the metals as Sn(II) species. The passivity is due to the formation of thin film of SnO 2 and or Sn(OH) 4 on the anode surface. The cathodic sweep shows a small peak C related to the reduction of the passive film. The peak current density I p of peak A increases with increasing both acid concentration and sweep rate. The effects of adding increasing concentrations of Na 2CrO 4, NaMoO 4, NaNO 3 and NaNO 2 on the corrosion of tin in 0.5 M citric acid at 30 °C were investigated. Both CrO 4 2− and MoO 4 2− ions inhibit the corrosion of tin and the extent of inhibition enhances with their concentrations. Addition of either NO 3 − or NO 2 − accelerates the corrosion of tin. NO 3 − ions are more aggressive than NO 2 − ions.
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