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.
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1 December 2020
Research Article|
August 15 2020
Effect of Microstructure Evolution on Corrosion Behavior of Friction Stir Welded Joint for 2195-T8 Alloy
B.Y. Hu;
B.Y. Hu
*School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
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H. Zhang;
H. Zhang
**School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.
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L.Y. Liu;
L.Y. Liu
***Beijing Institute of Astronautical Systems and Engineering, Beijing 100076, China.
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D.B. Liu;
D.B. Liu
***Beijing Institute of Astronautical Systems and Engineering, Beijing 100076, China.
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A.H. Feng;
A.H. Feng
‡
*School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
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Online ISSN: 1938-159X
Print ISSN: 0010-9312
© 2020, NACE International
2020
CORROSION (2020) 76 (12): 1099–1108.
Citation
B.Y. Hu, H. Zhang, L.Y. Liu, D.B. Liu, A.H. Feng, D.L. Chen; Effect of Microstructure Evolution on Corrosion Behavior of Friction Stir Welded Joint for 2195-T8 Alloy. CORROSION 1 December 2020; 76 (12): 1099–1108. https://doi.org/10.5006/3567
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