Zinc or cadmium electroplating brightener compositions and process
AssigneeSterling Drug Inc.
InventorJohn C. Kosmos
Life of this patent
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Abstract
Electroplating brightener compositions for addition to either alkaline or low, intermediate or high cyanide zinc or cadmium electroplating baths comprising an aqueous solution of corn syrup or glucose, vanillin, veratraldehyde, sodium lignin sulfonate, sodium bisulfite and niacinamide.
Claims12
In a process for bright plating of zinc or cadmium from aqueous alkaline cyanide electroplating baths, the improvement which comprises adding to said baths an aqueous composition containing, in parts by weight:
- Sodium lignin sulfonate 1.1-4.8 Veratraldehyde 1.0 Vanillin 0.1-2.5 Corn syrup or glucose 1.7-5.0 Niacinamide 0.007-0.14
- and a molar equivalent amount of sodium bisulfite equal to the total molar equivalent amount of the vanillin and veratraldehyde.
In a process for barrel or still bright plating of cadmium or barrel plating of zinc from aqueous alkaline cyanide electroplating baths, the improvement which comprises adding to said baths an aqueous composition containing, in parts by weight:
- Sodium lignin sulfonate 1.1-4.8 Veratraldehyde 1.0 Vanillin 0.1-2.5 Corn syrup or glucose 1.7-5.0 Niacinamide 0.007-0.14 Ammonium heptamolybdate 0.02-0.4
- and a molar equivalent amount of sodium bisulfite equal to the total molar equivalent amount of the vanillin and veratraldehyde.
In a process for still bright plating of zinc from aqueous alkaline cyanide electroplating baths, the improvement which comprises adding to said baths an aqueous composition containing, in parts by weight:
- Sodium lignin sulfonate 1.1-4.8 Veratraldehyde 1.0 Vanillin 0.1-2.5 Corn syrup or glucose 1.7-5.0 Niacinamide 0.007-0.14 Ammonium heptamolybdate 0.017-0.2 and a molar equivalent amount of sodium bisulfite equal to the total molar equivalent amount of the vanillin and veratraldehyde.
An electroplating brightener composition for addition to zinc or cadmium alkaline cyanide electroplating baths comprising an aqueous solution containing, in parts by weight:
- Sodium lignin sulfonate 1.1-4.8 Veratraldehyde 1.0 Vanillin 0.1-2.5 Corn syrup or glucose 1.7-5.0 Niacinamide 0.007-0.14
- and a molar equivalent amount of sodium bisulfite equal to the total molar equivalent amount of the vanillin and veratraldehyde.
An electroplating brightener composition for addition to cadmium barrel or still plating or zinc barrel plating alkaline cyanide electroplating baths comprising an aqueous solution containing, in parts by weight:
- Sodium lignin sulfonate 1.1-4.8 Veratraldehyde 1.0 Vanillin 0.1-2.5 Corn syrup or glucose 1.7-5.0 Niacinamide 0.007-0.14 Ammonium heptamolybdate 0.02-0.4
- and a molar equivalent amount of sodium bisulfite equal to the total molar equivalent amount of the vanillin and veratraldehyde.
An electroplating brightener composition for addition to zinc still plating alkaline cyanide electroplating baths comprising an aqueous solution containing, in parts by weight:
- Sodium lignin sulfonate 1.1-4.8 Veratraldehyde 1.0 Vanillin 0.1-2.5 Corn syrup or glucose 1.7-5.0 Niacinamide 0.007-0.14 Ammonium heptamolybdate 0.017-0.2
- and a molar equivalent amount of sodium bisulfite equal to the total molar equivalent amount of the vanillin and veratraldehyde.
Dependencies are inferred from the claim text.