Effects of organic carboyl compounds on brightening and electrochemical behavior were studied in the electrodeposion of tin from acid sulfate bath. Electrochemical polarization measurements, potential sweep voltammetry and scanning microscopy were applied. Among the compounds examined, benzalacetone was the best additive for the brightener, and its adsorption on electrode in an acidic solution was ascertained through cyclic voltammetry.
Correlation between Differential Capacity and Luster of Electroplated Tin in Acid Brights Tin Plating Correlation between the differential capacity and the luster of plated tin was studied in the electrodeposition of tin from acidic tin plating bath containing organic brightners. The luster appeared when the plating potential agreed almost with the desorption potential of the brightner in cathodic direction on the potential vs. differential capacity curve. The differential capacity in the electrodeposition of tin was discussed in connection with the adsorption of effective brightners on the tin electrode. The finest luster was obtained in the bath with 0.3g/l benzalacetone at the plating potential of-800 mV (vs. S.C.E.).
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