Abstract
The electrochemical characteristics of Al-Al3Ni eutectic alloys were investigated by polarization tests and potentiostatic dissolution tests. EDAX analysis of various phases in the alloys and scanning electron microscopic observation of the surface of the alloys corroded in a dilute HClO4 solution were also performed.The results obtained are summarized as follows:(1) The anodic dissolution rates of Al-Al3Ni eutectic alloys in a dilute HClO4 solution increase with increasing HClO4 concentration and solution temperature. However, the rates are decreased in the order of Al-5.65 mass%Ni alloy>Al-29.8 mass%Ni alloy>Al-42.57 mass%Ni alloy. The anodic dissolution rates increase with increasing surface area rations of eutectic stracture in the alloys.(2) The apparent activation energies of anodic dissolution are 30.6 kJ/mol for the Al-5.65 mass%Ni alloy, 33.4 kJ/mol for the Al-29.8 mass%Ni alloy and 44.6 kJ/mol for the Al-42.57 mass%Ni alloy, respectively.(3) The main anodic dissolution reaction of all the alloys in the dilute HClO4 solution is the selective dissolution of the Al(α) phase from the Al(α)+Al3Ni(β) eutectic structure. However, on the Al-42.57 mass%Ni alloy, the dissolution of Al from Al3Ni(β) occurs as a side reaction.
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