Metal treatment – Compositions – Heat treating
Patent
1977-04-20
1980-02-19
Bashore, S. Leon
Metal treatment
Compositions
Heat treating
148 63, 338 35, 427126, C23C 108, C23F 700
Patent
active
041893301
ABSTRACT:
The transfer elements of a heat and humidity exchanger are made by forming the transfer elements in the desired configuration and of a non-hygroscopic metal such as aluminum, and treating the surfaces to produce an integral hygroscopic layer thereof. This is done by oxidizing the surface of the metal to form an oxide layer, which itself is hygroscopic, and preferably enhancing the hygroscopic properties by subsequent impregnation of the oxide with a hygroscopic material such as lithium chloride. According to one form of the method, the oxidizing layer is produced by immersing the transfer elements, in a bath such as a warm aqueous solution of sodium hydroxide, or sodium carbonate, followed by heating in humid air; in a second form of the method, the oxide layer is produced by heating in humid air, or in a water, without preliminary alkaline treatment; in a third form of the method, the oxide layer is formed in a water bath containing an oxidizing agent such as trietanolamin or hydrogen peroxide. When preliminary alkaline treatment is used, it is preferably followed by an acid treatment prior to heating. In any of these methods, the oxidation step is preferably preceded by an acid treatment to render the surfaces of the transfer elements more porous.
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Strindehag Ove
Wrangel Erik
AB Svenska Flaktfabriken
Bashore S. Leon
Yeung George C.
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