Chemistry: electrical and wave energy – Processes and products
Patent
1984-08-16
1986-03-04
Metz, Andrew H.
Chemistry: electrical and wave energy
Processes and products
204 27, 204 42, 204 56R, 126901, C25D 518, C25D 548, G02B 110
Patent
active
045740410
ABSTRACT:
The present invention relates to selective surfaces for collectors of solar and other thermally useful radiation. According to the invention, a zinc-coated metal plate having a thickness of between 2.mu. and 30.mu. is immersed in an alkaline bath containing 2 to 30 g/l OH.sup.- and comprising sodium nitrate and sodium hydroxide. Subsequently, the anodized plate is passivated in an acidic bath which contains more than 2 g/l H.sup.+. Preferred constituents in the acidic bath are selected from acidic phosphate salts, oxalic acid, chromium ions, sulfuric acid or mixtures of two or more thereof. The selective thermal radiation collector surfaces obtained possess improved radiation properties, being capable of maintaining them even under corrosive conditions.
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patent: 3335074 (1967-08-01), Wright et al.
patent: 3573177 (1971-03-01), McNeil
patent: 3920413 (1975-11-01), Lowery
patent: 4190321 (1980-02-01), Dorer et al.
patent: 4243496 (1981-01-01), Rosset et al.
patent: 4448487 (1984-05-01), Cuomo et al.
Tamir Shoshana
Zahavi Joseph
Chapman Terryence
Metz Andrew H.
Technion Research and Development Foundation Ltd.
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