Abstract
Abstract Anodic polarization of tin, nickel, and a tin/nickel alloy was studied by the potentiostatic technique, in KOH and K2CO3 solutions in the concentration range 0.1 to 0.5M. The effect of Cl−, Br−, and I− ions, 10−4 to 10−1 M, on the anodic behavior in both KOH and K2CO3 solutions was also investigated. The results are presented along with probable dissolution and passivation mechanisms that were observed during the experiments. For tin, Icc was found to increase with increasing alkali concentration, while Ip was not affected, and their values in K2CO3 were much lower than those obtained in KOH solutions. Active regions were not observed in the case of Ni and the Sn/Ni alloy in both alkali solutions. The presence of halide ions was shown to decrease the value of Icc for Sn in both KOH and K2CO3 solutions. A large increase in Ip for Sn and Ni was observed in K2CO3 solution containing 10−1 M Cl− ion, while Ip for the alloy remained unaltered.
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