Effect of Microstructure Evolution on Corrosion Behavior of Friction Stir Welded Joint for 2195-T8 Alloy-Reference-Cited by-同舟云学术

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

Published:2020-08-15 Issue:12 Volume:76 Page:
ISSN:0010-9312
Container-title:Corrosion
language:en
Short-container-title:

Author:

Hu B.Y.¹,Zhang H.²,Liu L.Y.³,Liu D.B.³,Feng A.H.¹,Chen D.L.¹

Affiliation:

1. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.

2. School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.

3. Beijing Institute of Astronautical Systems and Engineering, Beijing 100076, China.

Abstract

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.

Publisher

NACE International

Subject

General Materials Science,General Chemical Engineering,General Chemistry

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