HOT DIP COATED STEEL SHEET HAVING EXCELLENT PRETREATABILITY BEFORE PAINTING AND ITS PRODUCTION

PURPOSE:To easily produce a hot dip coated steel sheet having excellent pretreatability before painting by spraying an aq. soln. of Co salt, Ni salt, Fe salt, etc., to the surface of a Zn hot dip coating layer in a high-temp. state and thermally decomposing the above-mentioned salts, thereby forming...

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Bibliographische Detailangaben
Hauptverfasser:	SUZUKI MASARU, DEGUCHI TAKENORI
Format:	Patent
Sprache:	eng
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL 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 PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SPRAYING OR ATOMISING IN GENERAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To easily produce a hot dip coated steel sheet having excellent pretreatability before painting by spraying an aq. soln. of Co salt, Ni salt, Fe salt, etc., to the surface of a Zn hot dip coating layer in a high-temp. state and thermally decomposing the above-mentioned salts, thereby forming an oxide film on the surface. CONSTITUTION:The steel sheet is subjected to hot dip coating of Zn or Zn-Al alloy and further the plating deposition is adjusted. The aq. soln. of >=1 kinds among the Co salt, Ni salt and Fe salt is atomized and sprayed onto the surface of the plating layer formed in such a manner while said layer is at >=170 deg.C or after the plating layer is heated to =1 kinds among Co, Ni and Fe. The hot dip coated steel sheet having the excellent chemical convertibility is thereby obtd. without subjecting the steel sheet to a surface prepn. treatment prior to the chemical conversion treatment in a pretreatment stage before painting.