Alkaline zinc electroplating bath and additive compositions therefor
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United States of America Patent
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Jul 1, 1980
Grant Date -
N/A
app pub date -
Jun 28, 1979
filing date -
Jun 28, 1979
priority date (Note) -
Expired
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Abstract
A composition is described which provides an improvement in the electrodeposition of zinc from aqueous alkaline plating baths containing cyanide ions. The new composition comprises the reaction product obtained by the process of reacting (a) a polyhydroxyethylated polyamine having a carbon to nitrogen weight ratio of about 2.8:1 to about 3.3:1 and a nitrogen to oxygen weight ratio of about 1:1 to about 2:1, and (b) a 3-halo-2-hydroxypropane sulfonate. Aqueous, alkaline cyanide zinc electroplating baths containing the additive compositions of the invention deposit a bright zinc coating over a wide range of current densities.
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