BLACKENING METHOD FOR COPPER OR COPPER ALLOY

PURPOSE:To uniformly form a black oxide film with superior solar heat absorptivity on a molding of Cu or a Cu alloy by immersing the molding in a blackening soln. contg. caustic alkali and specified oxidizing agents. CONSTITUTION:After degreasing and cleaning the surface of a warm water unit or the...

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Bibliographische Detailangaben
Hauptverfasser:	MACHIDA TAKAO, YAMASHITA SADAO
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING 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 GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LIGHTING MECHANICAL ENGINEERING METALLURGY RANGES REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE VENTILATING WEAPONS
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Beschreibung
Zusammenfassung:	PURPOSE:To uniformly form a black oxide film with superior solar heat absorptivity on a molding of Cu or a Cu alloy by immersing the molding in a blackening soln. contg. caustic alkali and specified oxidizing agents. CONSTITUTION:After degreasing and cleaning the surface of a warm water unit or the like made of Cu or Cu alloy as a body absorbing solar heat, the body is dipped in a nitric acid soln. having 300-320g/l concn. at ordinary temp. to smoothen the surface. The smoothened body is then immersed in an aqueous soln. contg. 20-40g/l NaOH or other caustic alkali, 5-10g/l alkali persulfate and 2-5g/l acid alkali sulfate as oxidizing agents at 50-90 deg.C for 2-20min, thus forming a uniform black oxide film with high solar heat energy absorptivity and less radiation loss.