Abstract
Mirror-bright electrodeposition of lead-tin alloys was obtained from the fluoborate bath containing reaction products of aldehydes and amines as main brighteners. An example of bath composition and operating conditions was as follows:Stannous tin 60g/lLead 25g/lFree HBF4 100Free H3BO3 25g/lBrighteners (20% solution) 40ml/lPolyethylene glycol nonylphenyl ether (15H) 60g/lβ-naphtol 1g/lFormaldehyde (37%) 20ml/lTemperature 20°CCathode current density 3A/dm2Agitation mildAnode 60%tin-40% leadFormaldehyde and β-naphtol were effective for lowering the range of current density for obtaining bright deposit. When the concentrations of these compounds were lower in the bath, the range of current density for obtaining bright deposit was higher.
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