METHOD AND SYSTEM FOR DEPOSITING A ZINC-NICKEL ALLOY ON A SUBSTRATE
A method for depositing a zinc-nickel alloy on a substrate, including:(a) providing the substrate,(b) providing an aqueous zinc-nickel deposition bath as catholyte in a compartment, wherein the compartment includes an anode and anolyte, the anolyte being separated from catholyte by a membrane, and t...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A method for depositing a zinc-nickel alloy on a substrate, including:(a) providing the substrate,(b) providing an aqueous zinc-nickel deposition bath as catholyte in a compartment, wherein the compartment includes an anode and anolyte, the anolyte being separated from catholyte by a membrane, and the catholyte includes nickel ions, complexing agent, zinc ions,(c) depositing zinc-nickel alloy onto the substrate, wherein after step (c) nickel ions have lower concentration than before step (c),(d) rinsing the zinc-nickel coated substrate in water, obtaining a rinsed zinc-nickel coated substrate and rinse water including a portion of the complexing agent and nickel ions,wherein (i) a portion of rinse water and/or a portion of catholyte is treated in a first treatment compartment to separate water from the complexing agent and the nickel ions,(ii) returning the separated complexing agent to the catholyte, and(iii) adding nickel ion to the catholyte. |
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