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Abstract
Pitting corrosion has been observed around intermetallic compounds on aluminum alloys. In order to obtain the relationship between the microscopic pitting corrosion and the composition of intermetallic compounds, Al-0.6%Fe alloys which contains silicon ranging from 0.09% to 1.51% were investigated by means of electrochemical measurements and metallographic observations. The additional effects of silicon to Al-Fe alloys have been presented in increasing of cathodic polarization resistance with an increase in the Si/Fe ratio in the intermetallic compounds. The most frequent occurences of microscopic pitting corrosion were discussed. Pitting corrosion was supposed to break at the boundary of intermetallic compound which has the lowest Si/Fe ratio and aluminum matrix which has the lowest impurity content.
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