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Anodic polarization of Al-Sn alloy in H3PO4 solutions
Authors:F H Assaf
Institution:(1) South Valley University, Faculty of Science, Chemistry Department, Qena, Egypt, EG
Abstract:The anodic polarization behaviour of Al-Sn alloy (5.6% Sn) was studied in aerated 1, 1.5 and 2 M H3PO4 acid solutions using potentiodynamic and potentiostatic techniques. Anodic behaviour of Al and Sn metals was investigated for comparison. The results show that the alloy exhibits active-passive transition behaviour. The passivation of the examined alloy is due to the formation of oxide film for both Al and Sn incorporated with their phosphates. In general, at constant concentration of PO4 3− ion, the passive current density (I pass) is decreased with increase of pH in the range 2.5–5. Further, the influence of Cl ions on the passivity of the given alloy was studied. It was found that the aggressive effect of Cl ions on the passive film is inhibited with increase in phosphate concentration and pH. However, the addition of organic compounds (2- and 3-picoline and 2-aminopyridine) shows that only 2-aminopyridine inhibited the attack of Cl ions. Received: 24 October 1997 / Accepted: 5 February 1998
Keywords:Anodic polarization  Aluminium-tin alloy  Passivation  Chloride  Phosphoric acid
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