Composition for stripping nickel from substrates and process
AssigneeHubbard-Hall, Inc.
InventorsDaniel Humphreys, Robert Farrell
Life of this patent
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Abstract
A nickel stripping composition is disclosed. The composition can be contacted with a nickel plated article in an aqueous solution in order to remove the nickel. In accordance with the present invention, besides an oxidizing agent, the composition includes the combination of an organic amine and citric acid or salt. Alternatively, other amines containing particular substituent groups can be present in the solution in order to increase the nickel holding capacity of the solution.
Claims23
A composition for selectively removing materials containing nickel from substrates comprising:
- an oxidizing agent capable of oxidizing nickel;
- an amine, the amine comprising a material selected from the group consisting of alkanolamines:
- hydroxylamines, and salts thereof;
- and
- an organic acid, boric acid, or a salt thereof, said organic acid, boric acid or salt thereof neutralizing said amine, said organic acid , boric acid or salt thereof and said amine being present in said composition in an amount sufficient to increase the nickel holding capacity of said composition, and wherein the composition has a pH of greater than 6.5 when present in an aqueous solution.
A composition for selectively removing materials containing nickel from substrates comprising:
- an oxidizing agent capable of oxidizing nickel;
- and
- at least a first amine or salt thereof including a substituent group containing —OH, —NH2, —NH, —SH, —C═O, —SO3, or —NO2, said first amine being present in said composition in an amount sufficient to increase the nickel holding capacity of said composition, and wherein the composition has a pH of greater than 6.5 when present in an aqueous solution.
A composition for selectively removing materials containing nickel from substrates comprising:
- an oxidizing agent capable of oxidizing nickel;
- an organic amine;
- urea;
- and
- an organic acid, boric acid or a salt thereof, said organic acid, boric acid or salt thereof neutralizing the organic amine, the organic acid, boric acid, or salt thereof and said organic amine being present in the composition in an amount sufficient to increase the nickel holding capacity of the composition.
A composition for selectively removing materials containing nickel from substrates comprising:
- an oxidizing agent capable of oxidizing nickel;
- an organic amine;
- and
- an organic acid or salt thereof, the organic acid or salt thereof comprising a material selected from the group consisting of maleic acid, lactic acid, glycolic acid, erythoribic acid, and salts thereof, the organic acid or salt thereof neutralizing the organic amine, the organic acid or salt thereof and the organic amine being present in the composition in an amount sufficient to increase the nickel holding capacity of the composition.
Dependencies are inferred from the claim text.