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The basic composition and operating conditions suitable for electroplating of bright tin-lead alloys from 2-propanolsulfonate bath were determined from the measurments of the bright area percentage of Hull Cell test panel, tin content in the alloy deposit, throwing power and current efficiency. The basic bath composition thus determined was as follows; total metal 20g/l, free acid 100g/l, non-ionic surface-active agent 20g/l, brightener (a condensation product of o-toluidine with acetaldehyde-20% solution in isopropyl alcohol) 20ml/l and formaline (37%) 8ml/l. Throwing power of the bath did not vary with the concentrations of bath components near the basic bath composition range. Current efficiency was about 70% for the basic bath composition and at a current density of 3A/dm2. It increased with increasing metal concentration and decreased with increasing concentration of the brightener and current density. Metal ratio in the deposit was nearly equal to that in the bath over the wide ranges of plating conditions and bath concentrations.
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