抄録
The effect of additional Fe, Ni, and Mn on corrosion rate of sacrificial anode fin stock for automotive heat exchangers has been investigated in terms of size, density and chemical composition of intermetallic compounds. Corrosion rate increased with Fe and Ni addition in Al–1.0Mn–1.5Zn alloy, because AlMnFe and AlNiFe compounds worked as effective cathode in the alloy. On the other hand, corrosion rate decreased with increasing of Mn content in Al–Mn–Fe–1.5Zn alloys in spite of increasing of compound density. This was because cathodic effect of AlMnFe compound decreased with decreasing of Fe/Mn ratio in the compound.
