TREATING SOLUTION FOR FORMING BLACK CHROMATE FILM ON ZINC-NICKEL ALLOY PLATING FILM

PURPOSE:To form a black chromate film having high corrosion resistance on a Zn-Ni alloy plating film by adding an org. acid to conventional soln. for black chromating process for Zn. CONSTITUTION:About 0.05-100g/l one or more kinds of compds. selected among carboxylic acids such as formic acid, lact...

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Bibliographische Detailangaben
Hauptverfasser:	AOE TETSUHIRO, YANAGAWA MORIYUKI, TAKASUGI YUKIO
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:	PURPOSE:To form a black chromate film having high corrosion resistance on a Zn-Ni alloy plating film by adding an org. acid to conventional soln. for black chromating process for Zn. CONSTITUTION:About 0.05-100g/l one or more kinds of compds. selected among carboxylic acids such as formic acid, lactic acid, gluconic acid, citric acid, tartaric acid and malic acid as org. acids and salts of the acids are added to soln. for a black chromating process contg. chromate or dichromate ions, sulfate ions and a silver salt. By using the resulting chromating soln., a black chromate film having high corrosion resistance and fine appearance can be formed on a Zn-Ni alloy plating film contg.