IMPROVED BLACK CHROMIUM PLATING BATH USEFUL FOR SOLAR SELECTIVE COATINGS

The composition disclosed is an improved black chromium plating bath useful, for example, for solar selective coatings. The bath comprises an aqueous solution of sulphate-free chromic acid containing nitrate, borate and fluorosilicate ions. Such a bath can be employed at room temperature or higher,...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	RAJAGOPAL INDIRA, RAJAGOPALAN SUNDARAPANDIUM RAMA, GRIPS VATIA KRISHNAMURTHY WILLIAM
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR BLASTING CHEMISTRY ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING LIGHTING MECHANICAL ENGINEERING METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS RANGES REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION SOLAR HEAT COLLECTORS SOLAR HEAT SYSTEMS TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE VENTILATING WEAPONS
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Beschreibung
Zusammenfassung:	The composition disclosed is an improved black chromium plating bath useful, for example, for solar selective coatings. The bath comprises an aqueous solution of sulphate-free chromic acid containing nitrate, borate and fluorosilicate ions. Such a bath can be employed at room temperature or higher, e.g. in the temperature range 30 DEG C to 50 DEG C, and at a low current density, e.g. 0.07 to 0.28 A/cm , to obtain a good quality black chromium deposit, which is quite coherent and has a high absorptivity to emissivity ratio, e.g. about 8.