Improving the corrosion resistance of friction stir welding joint of 7050 Al alloy via optimizing the process route

Yanqiu Wang; Yong Chen; Li Zhou; Yawei Shao; Li Liu; Jiantang Jiang

Journal of Materials Research and Technology (May 2023)

Improving the corrosion resistance of friction stir welding joint of 7050 Al alloy via optimizing the process route

Yanqiu Wang,
Yong Chen,
Li Zhou,
Yawei Shao,
Li Liu,
Jiantang Jiang

Affiliations

Yanqiu Wang: Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education, Harbin, 150001, China; Corresponding author.
Yong Chen: Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education, Harbin, 150001, China
Li Zhou: Shandong Provincial Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China
Yawei Shao: Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University), Ministry of Education, Harbin, 150001, China
Li Liu: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
Jiantang Jiang: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China; Corresponding author.

Journal volume & issue: Vol. 24
pp. 8098 – 8108

Abstract

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The macro-galvanic effect in friction stir welding (FSW) joints is contributive for accelerating the localized corrosion of 7xxx aluminum alloy weldment. A process route, solid solution treating→FSW→T76 ageing (SSW-T76), was developed to weak the macro-galvanic effect. The microstructure and corrosion of joints prepared from SSW-T76 route and the conventional route (T76→FSW, T76W) were comparatively investigated. It was found that both precipitate coarsening and solute segregation were effectively suppressed when the route was changed from T76W to SSW-T76. The discrepancy in microstructure, micochemistry and corrosion potential between the base material (BM), the heat-affected zone (HAZ) and the nugget zone (NZ) was narrowed, leading to suppressed macro-galvanic effect and thereafter to decreased pitting and IGC.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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