On the localized corrosion of AA5083 in a simulated dynamic seawater/air interface—Part 3: effects of sensitization

The effect of a 150 °C/144 h sensitization treatment on the localized corrosion of AA5083-O in a simulated dynamic seawater/air interface zone was investigated using electrochemical measurements and advanced characterization techniques. Sensitization resulted in an increase in the amount and the size of Al-Fe-Mn intermetallic particles (IMPs) in AA5083-O, and promoted the precipitation of β-Al3Mg2 at grain boundaries in the AA5083-O. Severe pitting corrosion occurred on sensitized AA5083-O in the seawater/air interface zone, an uneven and loose surface film appeared in the presence of β-Al3Mg2.