POST-TREATMENT OF CHROMATED ZN ALLOY PLATING

PURPOSE:To obtain a black or green chromate film having uniform appearance and color tone and stable corrosion resistance even by automatic treatment by treating chromated Zn alloy plating with an acidic soln. contg. PO4 and Cr2O7 under prescribed conditions. CONSTITUTION:An acidic soln. of pH 1-2.5...

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Bibliographische Detailangaben
Hauptverfasser:	YANAGAWA MORIYUKI, TAKASUGI YUKIO
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR 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 ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a black or green chromate film having uniform appearance and color tone and stable corrosion resistance even by automatic treatment by treating chromated Zn alloy plating with an acidic soln. contg. PO4 and Cr2O7 under prescribed conditions. CONSTITUTION:An acidic soln. of pH 1-2.5 contg. PO4 and Cr2O7 in 0.5-12 weight ratio of PO4 to Cr2O7 and further contg. alcohol and org. carboxylic acid is prepd. Zn-Fe alloy plating is chromated to form a black or green chromate film and this chromate film is treated with the acidic soln.