PROCESS FOR PREPARING CHROMIUM CONVERSION COATINGS FOR IRON AND IRON ALLOYS

Process of coating iron alloys to improve the corrosion resistance and adhesive bonding strengths. The process comprises treating the iron or iron alloys such as steel with an acidic aqueous solution comprising, per liter of solution, from about 0.01 to 22 grams of a water soluble trivalent chromium...

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Bibliographische Detailangaben
Hauptverfasser:	SCHWARTZ, ANDREW, S, MATZDORF, CRAIG, GREEN, JAMES, L, NICKERSON, WILLIAM, C., JR
Format:	Patent
Sprache:	eng ; fre
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:	Process of coating iron alloys to improve the corrosion resistance and adhesive bonding strengths. The process comprises treating the iron or iron alloys such as steel with an acidic aqueous solution comprising, per liter of solution, from about 0.01 to 22 grams of a water soluble trivalent chromium compound, about 0.01 to 12 grams of hexafluorozirconate, at least one tetrafluoroborate and/or hexafluorosilicate, at least one water soluble divalent zinc compound and from 0.0 to 10 grams of water soluble thickeners and/or water soluble surfactants. L'invention concerne un procédé permettant de recouvrir des alliages de fer afin d'améliorer leur résistance à la corrosion et leurs forces de liaison par adhésion. Ledit procédé consiste à traiter le fer ou un alliage de fer, tel que l'acier, avec une solution aqueuse acide comprenant, par litre de solution, environ 0,01 à 22 grammes d'un composé de chrome trivalent soluble dans l'eau, environ 0,01 à 12 grammes d'hexafluorozirconate, au moins un tétrafluoroborate et/ou un hexafluorosilicate, au moins un composé de zinc divalent soluble dans l'eau, 0,0 à 10 grammes d'épaississants solubles dans l'eau et/ou des tensioactifs solubles dans l'eau.