PROCEDE DE PROTECTION D'UN ALLIAGE DE TYPE CUIVRE-ZINC PAR PROCEDE SOL-GEL

The invention relates to a method for preparing a part made of copper, a copper alloy containing at least 60 wt.% copper relative to the total weight of the alloy, nickel, or a nickel alloy and coating said alloy part with at least one transparent layer having a thickness between 1 and 10 μm so as t...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	PRIMAUX FRANCOIS, GOURDIN PHILIPPE
Format:	Patent
Sprache:	fre
Schlagworte:	ALLOYS 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 FERROUS OR NON-FERROUS ALLOYS 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 TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The invention relates to a method for preparing a part made of copper, a copper alloy containing at least 60 wt.% copper relative to the total weight of the alloy, nickel, or a nickel alloy and coating said alloy part with at least one transparent layer having a thickness between 1 and 10 μm so as to protect said layer from chemical and/or mechanical stress. In said method, according to the steps for developing producing the alloy or metal in the foundry and for manufacturing the part, preparation of the surface of the part is carried out before applying, ontoat said surface, at least one main controlled-thickness layer of a sol-gel coating onto said part. Said coating is obtained from a sol comprising two precursors: ASB/GPTMS (aluminum tri-sec butoxide / 3-glycidyloxypropyltrimethoxysilane). A specific heat treatment is then carried out so as to enable densification of the coating. The parts covered by said coating have particularly attractive visual qualities and improved resistance to outer external stress.