METHOD FOR REGENERATING ELECTROLESS NICKEL PLATING LIQUID

PROBLEM TO BE SOLVED: To provide a method for regenerating a plating liquid that prevents loss of useful components, such as nickel and a chelating agent, decreases the amount of acid discharged, and also has a low running cost by using a diffusion dialysis method.SOLUTION: The method is for regener...

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Bibliographische Detailangaben
Hauptverfasser:	NOSAKA HIDEO, KAWAHARA TAKUO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for regenerating a plating liquid that prevents loss of useful components, such as nickel and a chelating agent, decreases the amount of acid discharged, and also has a low running cost by using a diffusion dialysis method.SOLUTION: The method is for regenerating an aged liquid containing a byproduct in electroless plating using as an undiluted solution an electroless nickel plating liquid including as a main component an aqueous hypophosphorous acid solution containing a nickel ion (Ni2+). In the method, sodium phosphite and sodium sulfate included in the aged liquid are converted into phosphorous acid and sulfuric acid by: replacing Na ions of the sodium phosphite and sodium sulfate with H ions; and then separating the phosphorous acid and the sulfuric acid from the plating liquid using a diffusion dialysis membrane 3, thereby regenerating the electroless nickel plating liquid.