Corrosion Resistance of Friction Stir Welded Al–Cu–Li Alloy AA2099-T8

In order to study the effect of friction stir welding (FSW) on corrosion resistance of Al–Cu–Li alloy AA2099-T8, the microstructure and microhardness of FSW joints were characterized, and then, the corrosion behavior of the FSW joints was investigated by the immersion and potentiodynamic polarizatio...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2020, Vol.33 (1), p.127-134
Main Authors: Ma, Yan-Long, Xu, Hui-Bin, Liang, Zhao-Yuan, Liu, Lei
Format: Article
Language:English
Subjects:
Aircraft
Alloys
Aluminum alloys
Aluminum base alloys
Base metal
Characterization and Evaluation of Materials
Chemistry and Materials Science
Copper
Corrosion and Coatings
Corrosion effects
Corrosion resistance
Corrosion tests
Crack propagation
Electrodes
Electrolytes
Friction resistance
Friction stir welding
Lithium
Localized corrosion
Materials Science
Metallic Materials
Microhardness
Nanotechnology
Organometallic Chemistry
Room temperature
Sodium chloride
Spectroscopy/Spectrometry
Stress corrosion cracking
Tribology
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Summary:In order to study the effect of friction stir welding (FSW) on corrosion resistance of Al–Cu–Li alloy AA2099-T8, the microstructure and microhardness of FSW joints were characterized, and then, the corrosion behavior of the FSW joints was investigated by the immersion and potentiodynamic polarization tests in a 3.5% NaCl solution at room temperature. It is indicated that the alloy was softened by FSW, with the lowest hardness appearing at the boundary between the nugget zone and the thermo-mechanically affected zone. When exposed to the NaCl solution, the FSW joint was characterized by shallow pits and was free of severe localized corrosion, probably due to dissolution of T 1 (A 2 CuLi) phase in the FSW joint. It is suggested that further work should be carried out to evaluate the galvanic coupling effect between the FSW joint and the base metal, as well as the stress corrosion cracking resistance of the FSW joint.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-019-00944-w