Acid tin bath and tin/lead bath respectively for the electrode-p

Details Acid tin bath and tin/lead bath respectively for the electrode-p Acid tin bath and tin/lead bath respectively for the electrode-p

1982-06-24

1983-06-14

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 54R, 546270, 549453, 549454, 549455, C25D 332, C25D 360

Patent

active

043881610

ABSTRACT:
Bright deposits of tin and tin/lead alloys by electrocoating are obtained by using a bath containing tin salts and, optionally, lead salts, aldehydes and/or ketones as brighteners as well as surfactants besides sulfuric acid and/or borofluohydric acid wherein part or all of the aldehydes and/or ketones are replaced by a cyclic reaction product of one or more aromatic aldehydes and epihalohydrin of the general formula ##STR1## (Hal being chlorine or bromine, R being a phenyl, naphthyl or pyridyl radical which is optionally substituted by one to three members of the group consisting of chlorine, bromine or fluorine atoms, alkyl or alkoxy groups having 1 to 3 carbon atoms, carboxy and hydroxy groups). Preferably the cyclic reaction product is contained in the bath in an amount of from 0.1 to 2 g/liter of the bath.

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