Abstract
A solar selective black nickel-cobalt coating which is more stable than the widely used black nickel (NiS-ZnS) has been formed on zincated and zinc-electroplated aluminium substrates by a conversion process. Coatings with an integrated solar absorptance α in the range 0.90–0.94 and a room temperature emittance ε in the range 0.07–0.12 have been obtained. The effect of various deposition parameters on the optical properties and microstructure has been studied. The effect of thermal annealing in air at various temperatures on the optical properties and microstructure of the coatings has also been investigated.
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