Abstract
The corrosion rate in a 0.5 kmol·m−3 NaOH aqueous solution of cold-rolled aluminum sheet was measured, and the results were analyzed from the point of view of the residual stress and rolling texture. For each total reduction (10-90%), which was applied to cold rolling, the specimens were equalized in initial thickness. The fixed reduction rate (Δh⁄h) and the fixed draught (Δh) were applied to the reduction per pass, and the initial orientation of the specimen and the surface character of the roll were varied. In the case of the reduction rate mode applied to the reduction per pass, the corrosion rate showed a non-monotonic increase; i.e. the curve has a maxima at 30 and 80% and a minimum at 50% total reduction. Contrary to this, in the fixed draught mode the corrosion rate reached a maximum value at 30% total reduction, and then decreased non-monotonically. Regardless of the difference in initial orientation, the corrosion rate showed the same behavior, but it became smaller as the crystal grain became larger. When cold rolling was performed on rolls with a rugged surface, the rolling texture showed a surface texture ((001)[1\bar10]) at 90% total reduction, and there was the correlation between residual stress and corrosion rate. In the case of the fixed draught mode applied to cold rolling, the residual stress decreased and the corrosion rate became smaller in the high domain of total reduction.
