Enhancing corrosion resistance of the nugget in a 2519-T87 aluminum alloy friction stir welded joint via tungsten inert gas arc-Reference-Cited by-同舟云学术

Enhancing corrosion resistance of the nugget in a 2519-T87 aluminum alloy friction stir welded joint via tungsten inert gas arc

Published:2024-02 Issue:1 Volume:29 Page:52-60
ISSN:1362-1718
Container-title:Science and Technology of Welding and Joining
language:en
Short-container-title:Science and Technology of Welding and Joining

Author:

Liu Shengdan¹²³,Yi Tie¹²³,Fang Chen¹³,Jiang Gengduo⁴,Dai Xuanxuan¹³

Affiliation:

1. School of Materials Science and Engineering, Central South University, Changsha, China

2. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha, China

3. Key Laboratory of Non-Ferrous Metals Materials Science and Engineering, Ministry of Education, Central South University, Changsha, China

4. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China

Abstract

The corrosion resistance of the nugget zone (NZ) in two 2519-T87 aluminum alloy joints obtained by conventional friction stir welding (FSW) and tungsten inert gas arc-assisted FSW (TIG-FSW) was evaluated by immersion corrosion tests and electrochemical measurements. The results show that TIG arc significantly enhances the corrosion resistance of the nugget, the maximum corrosion depth is reduced by about 59.6%, and the polarization resistance is increased by about 14.5%. The mechanism was discussed based on microstructural examination. TIG-FSW decreases the area fraction of coarse intermetallic compounds (IMCs) with an equivalent diameter larger than 2.0 μm and increases the number of submicron IMCs, avoids the accumulation of IMCs, leads to low local electrochemical activity, and consequently enhances the corrosion resistance of the NZ.

Publisher

SAGE Publications

Link

https://journals.sagepub.com/doi/pdf/10.1177/13621718231220878

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