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Effect of brazing and artificial aging on the corrosion and strengthening behavior of a quad-layer Al alloy composite

Dejing Zhou (Jiangsu Key Lab Clad Mat, Yin Bang Clad Mat Co Ltd, Wuxi, China and Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Yin Bang Clad Mat Co Ltd, Wuxi, China)
Yanming Xia (Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, China)
Zhiming Gao (Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, China)
Wenbin Hu (Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 24 April 2024

3

Abstract

Purpose

This study aims to investigate the influence mechanism of brazing and aging on the strengthening and corrosion behavior of novel multilayer sheets (AA4045/AA7072/AA3003M/AA4045).

Design/methodology/approach

Polarization curve tests, immersion experiments and transmission electron microscopy analysis were used to study the corrosion behavior and tensile properties of the sheets before and after brazing and aging.

Findings

The strength of the sheet is weakened after brazing due to brittle eutectic phases, and recovered after aging due to enhanced precipitation strengthening in the AA7072 interlayer. The core of nonbrazed sheets cannot be protected due to the significant galvanic coupling effect between the intermetallic particles and the substrate. Brazing and aging treatments promote the redissolved of second phased and limit corrosion along the eutectic region in the clad, allowing the core to be protected.

Originality/value

AA7xxx alloy was added to conventional brazed sheets to form a novel Al alloy composite sheet with AA4xxx/AA7xxx/AA3xxx structure. The strengthening and corrosion mechanism of the sheet was proposed. The added interlayer can sacrificially protect the core from corrosion and improves strength after aging treatment.

Keywords

Acknowledgements

This work was supported by Research Funders Ministry of Science and Technology of the People’s Republic of China (No. 2022YFB3705801) and the National Natural Science Foundation of China (Nos. 52271065 and 51871164).

Citation

Zhou, D., Xia, Y., Gao, Z. and Hu, W. (2024), "Effect of brazing and artificial aging on the corrosion and strengthening behavior of a quad-layer Al alloy composite", Anti-Corrosion Methods and Materials, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/ACMM-02-2024-2968

Publisher

:

Emerald Publishing Limited

Copyright © 2024, Emerald Publishing Limited

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