New processes for black coatings useful in harnessing solar energy. I - A room temperature black chromium plating bath

Rajagopalan, N and Vasudevan, N and Gripps, W and Rajagopalan, SR and Ramaseshan, S (1978) New processes for black coatings useful in harnessing solar energy. I - A room temperature black chromium plating bath. In: Proceedings of the International Solar Energy Congress on Sun: Mankind's future source of energy, 16-21 Jan 1978, New Delhi, India.

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Abstract

The fundamental requirements for a solar selective absorber are reviewed and various methods of obtaining selectivity together with high absorptivity are discussed. Conventional black chromium plating process is briefly surveyed. It is pointed out that its major limitation to industrial application arises from the necessity of using high current densities (75 to 150 amp/sq dm) and low temperatures (10-15 C), which demands refrigeration. Black chromium plating has now been achieved at current densities as low as 7.5 am/sq dm (i.e., same as that used for normal chromium plating) and at room temperature or even higher (up to 60 C). The optical properties and corrosion resistance of the coatings produced using this new process are discussed.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Chromium;Energy;Absorption films;Metal coatings;Platings;Solar energy absorbers;Corrosion resistance;Current density;Energy technology;Room temperature;Spectral sensitivity
Subjects: CHEMISTRY AND MATERIALS > Propellants and Fuels
AERONAUTICS > Aerodynamics
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: M/S ICAST NAL
Date Deposited: 06 Dec 2006
Last Modified: 24 May 2010 09:53
URI: http://nal-ir.nal.res.in/id/eprint/3632

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