PRODUCTION OF ZN ALLOY ELECTROPLATED STEEL SHEET HAVING SUPERIOR CHEMICAL TREATABILITY

PURPOSE:To improve the adhesion of a Zn alloy electroplated steel sheet to paint by electrolytically cleaning the plated surface with a slightly acidic or neutral aq. soln. and sticking a specified amt. of a phosphoric acid compd. on the plated surface. CONSTITUTION:A steel sheet is electroplated wi...

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Bibliographische Detailangaben
Hauptverfasser:	YONEZAWA KAZUMA, HONJO TORU
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 PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PURPOSE:To improve the adhesion of a Zn alloy electroplated steel sheet to paint by electrolytically cleaning the plated surface with a slightly acidic or neutral aq. soln. and sticking a specified amt. of a phosphoric acid compd. on the plated surface. CONSTITUTION:A steel sheet is electroplated with a Zn alloy, the plated surface is electrolytically cleaned with a slightly acidic or neutral aq. soln. and a phosphoric acid compd. is stuck on the plated surface by 0.01-50mg/m (expressed in terms of P). Any ordinary electrolytic cleaning soln. of >=4 pH may be used as the electrolytic cleaning soln. Soluble hypophosphorous acid, phosphorous acid, orthophosphoric acid, an alkali metal or alkaline earth metal salt thereof can be utilized as the P feeding source.