Nickel pigmented anodized aluminium as solar selective absorbers

Kumar, S.N. ; Malhotra, L. K. ; Chopra, K. L. (1983) Nickel pigmented anodized aluminium as solar selective absorbers Solar Energy Materials, 7 (4). pp. 439-452. ISSN 0165-1633

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The effect of various anodization parameters on the structural features and optical properties of solar absorbing nickel pigmented anodic alumina coatings has been studied. A correlation between the microstructural features and the solar selectivity of these coatings has been established. Stable coatings with low thermal emittance, ≈0.06 (at 100°C), and solar absorptance ≥ 0.90 have been prepared by anodizing in a phosphoric acid electrolyte. Addition of H2SO4 in the anodizing bath leads to an increase in the α and ε values of the film due to the formation of a thicker and alumina rich anodic film. By using a mixture of H3PO4 and H2SO4, α and ε values can be varied over a wide range of 0.90 ≤ α ≤ 0.96 and 0.06 ≤ ε (100°C) ≤ 0.46.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:23024
Deposited On:25 Nov 2010 13:40
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