Bright levelling zinc plating
AssigneeInternational Lead Zinc Research Organization, Inc.
InventorsDirej Vallabhbhai Patel, John Joseph Bernard Ward
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Abstract
Levelling agents for use in zinc electroplating solutions are described comprising thallous ions or a combination of peptone and thiourea. The thallous ions are preferably added to a concentration of at least 1 mg/l and the peptone-thiourea combination added to a concentration of at least 100 mg/l peptone and 50 mg/l thiourea.
Claims15
A solution for electrodepositing zinc comprising water, zinc ions in a concentration of at least 0.2 M, peptone in a concentration of at least 100 mg/l and thiourea in a concentration of at least 50 mg/l, the weight ratio of peptone to thiourea being from 1:1 to 5:1.
A solution for electrodepositing zinc comprising water, zinc sulphate in a concentration of from 0.2 to 3.0 M, zinc chloride in a concentration of from 10 g/l to 50 g/l, boric acid in a concentration of from 10 g/l to 50 g/l, and thallous ions in a concentration of at least 1 mg/l.
A solution for electrodepositing zinc comprising water, zinc chloride in a concentration of from 0.1 to 2.0 M, ammonium chloride in a concentration of from 1 to 3 M, boric acid in a concentration of from 10 g/l to 30 g/l, and thallous ions in a concentration of at least 1 mg/l.
A chelating agent-free aqueous electrolyte solution for electrodepositing zinc comprising zinc ions in a concentration of at least 0.2 M and thallous ions in a concentration of from 1 mg/l to 10 mg/l.
Dependencies are inferred from the claim text.