The effect of recrystallization on corrosion and electrochemical behavior of 7150 Al alloy

Abstract

Abstract By weight loss, potentiodynamic polarization, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS) techniques complemented by optical and scanning electron microscopy observations, the effect of recrystallization on the corrosion, and electrochemical behavior of 7150 Al alloy was studied. The results indicated that the high recrystallization fraction 7150‐1# was worse than the low recrystallization fraction 7150‐2# on corrosion resistance. The analysis of EIS indicated that 7150‐1# exhibited obvious pitting corrosion at 5 h immersion time, whereas 7150‐2# showed no obvious pitting corrosion even at 33 h. The corrosion route developed along the grain boundary of recrystallization grains, not along the grain boundary of unrecrystallization grains.