Abstract
The wettability and corrosion resistance of aluminum fins prepainted with a dual coating of cellulose on acrylic have been investigated.Formation of rust on aluminum fins in an indoor cooler was suppressed by painting with more than 0.5g/m2 thickness. Under exposure to corrosive environments, painted fins fitted to copper pipes in an outdoor cooler underwent severe galvanic corrosion. Accordingly, the corrosion resistance with acrylic painting of 1.5g/m2 was only twice as high as that of unpainted fins.The wettability of cellulose painted fins was excellent -5°-10° depending on the surfactant, and whether covering was complete or not. It was also confirmed that cellulose painting with good wettability reduced air pressure loss.
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