Abstract
The effect of cooling rate during solidification on corrosion resistance of aluminum alloy fin stock for automotive heat exchangers has been investigated. Constituent particles become much finer and denser with increasing of cooling rate, but, the area function of secondary phase particle did not change. Corrosion rate did not change with becoming finer and denser of secondary phase particle in Al–0.7mass%Fe–1.5mass%Zn alloy, because, Al3Fe particles themselves worked as a cathode. On the other hand, corrosion rate increased in the cases of Al–1.0mass%Mn–0.4mass%Fe–1.5mass%Zn alloy, because, matrix/Al6 (Mn, Fe) interface acts as a more active cathode than particles themselves.
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