FORMATION OF PATINA

PURPOSE:To stably form a patina film excellent in adhesion and uniform in color tone on the surface of a base material in a short time by forming a thin film of copper or a copper alloy on the base material surface and then treating the thin film with a chemical conversion coating soln. added with a...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	TAMANOI HIDEO, SATO HARUKI
Format:	Patent
Sprache:	eng
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:	PURPOSE:To stably form a patina film excellent in adhesion and uniform in color tone on the surface of a base material in a short time by forming a thin film of copper or a copper alloy on the base material surface and then treating the thin film with a chemical conversion coating soln. added with an oxidizing agent. CONSTITUTION:The surface of a base material on which patina is to be formed is preferably roughened, and then a thin film of copper or a copper alloy is formed on the surface. The thin film is preferably formed by thermal spraying, and its thickness is appropriately controlled to about 1-100mum or preferably to about 5-40mum. The surface roughness of this thin film is adjusted to about 3-50mum or preferably to about 5-40mum. The thin film is treated with a chemical conversion coating soln. mixed with >= about 3wt.% of an oxidizing agent such as MnO2. Consequently, the patina having a uniform and deep color tone is formed on the surface of the base material regardless of its kind with good adhesion in a short time.