Effect of Microstructure Evolution on Corrosion Behavior of Friction Stir Welded Joint for 2195-T8 Alloy

Corrosion behavior of friction stir welded 2195-T8 Al-Cu-Li alloy has been studied. Immersion and electrochemical open-circuit potential (OCP) test were applied. The microstructure and precipitates evolution in different zones were investigated by scanning electron microscopy, stereoscope, and trans...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2020-12, Vol.76 (12), p.1099
Main Authors: Hu, B.Y., Zhang, H., Liu, L.Y., Liu, D.B., Feng, A.H., Chen, D.L.
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Base metal
Chemical precipitation
Circuits
Copper
Corrosion
Corrosion effects
Corrosion potential
Corrosion resistance
Corrosion resistant alloys
Corrosion tests
Electrochemistry
Electron microscopy
Evolution
Friction
Friction stir welding
Galvanic corrosion
Grain boundaries
Grain size
Heat affected zone
Immersion tests (corrosion)
Intergranular corrosion
Metals
Microstructure
Morphology
Precipitate free zone
Precipitates
Recrystallization
Scanning electron microscopy
Submerging
Transmission electron microscopy
Welded joints
Welding
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Summary:Corrosion behavior of friction stir welded 2195-T8 Al-Cu-Li alloy has been studied. Immersion and electrochemical open-circuit potential (OCP) test were applied. The microstructure and precipitates evolution in different zones were investigated by scanning electron microscopy, stereoscope, and transmission electron microscopy. The corrosion tests showed that the sequence of corrosion resistance of each area of the joint is: welding nugget zone (WNZ) > base metal > heat affected zone (HAZ). The WNZ showed highest corrosion resistance due to the fine recrystallized grains, the dissolution of T1(Al2CuLi) phase, and the refined and evenly-distributed particles in this area. However, the HAZ had the lowest corrosion resistance due to the intergranular precipitates, deleterious precipitate-free zone (PFZ), S′ (Al2CuMg) phase, and the galvanic corrosion couples formed among T1, θ′, and PFZ.
ISSN:0010-9312
1938-159X
DOI:10.5006/3567