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-Al 3 Mg 2 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-Al 3 Mg 2. • The effects of sensitization on localized corrosion of AA5083 in a dynamic seawater/air interface were investigated. • Sensitization increased the number and the size of Al-Fe-Mn intermetallic particles (IMPs). • Sensitization promoted β-Al 3 Mg 2 precipitation at the grain boundaries. • A loose and uneven surface film was induced on the sensitized AA5083-O. • Severe pitting corrosion occurred on sensitized AA5083-O exposed to the seawater/air interface zone. [ABSTRACT FROM AUTHOR]