Ａｌ‐０．１％Ｓｎ‐Ｆｅ合金の電気化学的性質と腐食挙動

Abstract

The effect of iron content and cooling rate after brazing heat treatment on the electrochemical property and the corrosion behavior of Al–0.1 mass%Sn–Fe alloys were investigated. Pitting potential abruptly became noble at the critical iron content which decreased with the decrease of cooling rate. Tin is preferentially precipitated around Al–Fe intermetalic compounds. As the pitting of matrix initiated at the precipitates, the corrosion behavior depended on distribution of them. As the corrosion of the Al–0.1 mass%Sn–0.5 mass%Fe alloy with slower cooled after brazing heat treatment was a sort of uniform type consisting of a great many small pits, application of the alloy as a pitting corrosion resistant one can be expected.