Preparation and characterisation of a spectrally selective black chrome coating for solar energy applications

P.K.C. Pillai and R.C. Agarwal

Applied Energy, 1980, vol. 7, issue 4, 299-303

Abstract: Investigations have been carried out on spectrally selective solar absorbing coatings of black chrome prepared by spraying an aqueous solution of CrO3 on to chemically brightened aluminium substrates heated to 250-300°C. The advantages are good stability up to 250°C, low cost and the fact that the coatings can be used on collectors of any desired size. When subjected to severe humidity conditions the coatings showed signs of degradation. A thin polymer (polystyrene) overcoat prevented such degradation. The coatings have high absorptivities in the solar spectral region ([alpha]s [approximate] 0·93) and low emissivities in the infra-red region ([epsilon](100°C) [approximate] 0·16). In this paper the coating properties and problems encountered with available selective surfaces are discussed.

Date: 1980
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