Black chromium plating bath useful for solar selective coatings

Details Black chromium plating bath useful for solar selective coatings Black chromium plating bath useful for solar selective coatings

C - Chemistry, Metallurgy

25

D

204/35

C25D 3/08 (2006.01)

Patent

CA 2006130

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°C to 50°C and at a low current density e.g. 0.07 to 0.28 A cm2,to obtain a good quality black chromium deposit which is quite coherent and has a high absorptivity to emissivity ratio e.g. about 8 .

La composition de l'invention est un bain de chromage noir amélioré, utile, par exemple, pour des revêtements solaires sélectifs. Le bain comprend une solution aqueuse d'ions nitrate, borate et fluorosilicate, renfermant de l'acide chromique et exempte de sulfate. Ce type de bain peut servir, à la température de la pièce ou à des températures plus élevées, soit entre 30 et 50 degrés C, et à une faible densité de courant, p. ex. entreApp# 0,07 etApp# 0,28 A/cm2, à former un dépôt de chrome noir de bonne qualité, tout à fait uniforme et présentant un rapport absorptivité/émissivité de 8 environ.

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