EFFECTS OF ADDITIVE AGENTS ON THE KINETICS OF TIN ELECTRODEPOSITION FROM AN ACIDIC SOLUTION OF TIN(II) SULFATE

The effects of benzaldehyde, acetophenone and 4-methyl 2-pentanone add itives on deposition of tin in acidic solution of tin(II) sulfate were investigated. The solution containing the first two additives produce d greater cathodic polarization than that of the other ketone, accordi ng to galvanostatic experiments. The kinetics of deposition of tin, wi th or without additives, were investigated with cyclic voltammetry and Tafel plots. Based on these results, a mechanism is proposed for the deposition process. The correlation of overpotential with the diffusio n coefficient of Sn(LI) in various solutions was also investigated.