SURFACE-PRETREATMENT OF NON-METALLIC ARTICLES FOR CHEMICAL NICKEL-PLATING

1,214,420. Pretreatment of non metallic substrates prior to Ni coating, KNAPSACK A. G. July 25, 1969 [Aug. 1, 1968], No.37458/69. Heading C7F. Non metallic substrates e.g. plastics, rubber, glass, wood or ceramic prior to electroless Ni plating are pickled in concentrated H 2 SO 4 containing a noble...

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Bibliographische Detailangaben
Hauptverfasser:	MICHAEL AHLGRIM, GERHARD MIETENS, JOACHIM KANDLER
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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Zusammenfassung:	1,214,420. Pretreatment of non metallic substrates prior to Ni coating, KNAPSACK A. G. July 25, 1969 [Aug. 1, 1968], No.37458/69. Heading C7F. Non metallic substrates e.g. plastics, rubber, glass, wood or ceramic prior to electroless Ni plating are pickled in concentrated H 2 SO 4 containing a noble metal salt then the noble metal salt adhering to the substrate is reduced with an aqueous solution of a reducing agent e.g. sodium hypaphosphite, containing polyphosphoric acid. Term "noble metal includes Au, Ag, Hg, Pt, Ru, Rh, Pd, Os, Ir. Both pickling and reduction are effected at 75-90‹ C. The pickling solution may contain HNO 3 , H 2 O 2 , chromic acid or alkali metal persulphate and preferably 0À1-0À5g/l palladium chloride. The reducing agent contains 1-20 g/l of poylphosphonic acid, preferably hydroxyethane- .diphosphonic acid. Treating time is 2-20 minutes in each solution. The electroless Ni plating deposited has a high peel strength and electroplated Ni may be deposited on it.