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Effect of heat treatments on 8090 AlLi alloy pitting susceptibility in sea water
Author(s) -
Beccaria A. M.,
Traverso P.
Publication year - 1996
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19960470504
Subject(s) - microstructure , alloy , pitting corrosion , materials science , metallurgy , corrosion , homogeneous , grain boundary , electrochemistry , optical microscope , scanning electron microscope , composite material , chemistry , electrode , physics , thermodynamics
The 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.