Abstract
AbstractThe pitting susceptibility of 8090 Al‐Li alloy in sea water, after different heat treatments, was investigated.Free corrosion and electrochemical tests were carried out at 25°C, in quiescent sea water at pH = 8.2 and dissolved oxygen = 6.5 ppm.The microstructure was examined by metallographic microscopy and by X‐Ray microdiffractometry, while the corrosion layer was characterized by chemical methods and by Infrared and X‐Ray photoelectron spectroscopies.The following was observed: aging treatments lead to a non homogeneous microstructure which increases the average corrosion rate as well as pitting susceptibility; heat treatments do not affect the average passive film composition; in all examined states, Al‐Li alloy 8090 is subject to localized corrosion which takes place preferentially at the grain boundaries.
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