Osami Seri and Masato Takikawa
Department of Mechanical System Engineering, Muroran Institute of Technology, Muroran, 050-8585
It is well-known that iron is one of the most common impurity elements observed in industrial aluminum. Iron in the aluminum forms an intermetallic compound such as FeAl3. The FeAl3 exposed on the aluminum matrix are detrimental to corrosion. A simple and effective electrochemical treatment, by which selective removal of FeAl3 can proceed, has been developed with a number of trials. It is found that FeAl3-free surface is obtained by electrochemical treatments in a 17 mass%HNO3 solution. It is explained that a selective removal by electrochemical treatment attributes to two operations; one is the activation of FeAl3 surface by H2, N2O, NO and NO2 gas evolution reactions, and the other is the cathodic reactions:\begin{equation*
(Received November 20, 1998; In Final Form March 2, 1999)
aluminum, iron, electrochemical treatment, intermetallic compound, selective dissolution, nitric acid
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