Effect of Al-Si Coating on the Interfacial Microstructure and Corrosion Resistance of Dissimilar Laser Al Alloy/22MnB5 Steel Joints

Author:

Wu Lingqing1,Oliveira Joao Pedro2ORCID,Yang Jin1,Xiao Ming1,Zheng Min3,Xu Wenhu1,Zhao Yixuan1,Wang Feifan4,Zhang Hua13

Affiliation:

1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

2. CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal

3. School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China

4. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China

Abstract

This investigation employed different laser powers to conduct the laser welding–brazing process of 5052 aluminum alloy to both Al-Si coated and uncoated 22MnB5 steel. The flux-cored Zn-Al22 filler metal was employed during the procedure. The influence of Al-Si coatings on the microstructure and corrosion resistance of Al/Steel welded joints was investigated using microstructural characterization and electrochemical tests. It was noted that the interfacial microstructure of the laser Al/steel joints was significantly altered by the Al-Si coating. Moreover, the Al-Si coating suppressed the formation and growth of the interfacial reaction layer. Electrochemical corrosion tests showed that the impact of Al-Si coating on the corrosion resistance of laser joints depended on the laser powers and thickness of the interfacial intermetallic compound (IMC) layer. The research suggests that galvanic corrosion occurs due to the differences in corrosion potential between fusion zone (FZ), steel, and Fe-Al-Zn IMCs, which accelerate the corrosion of the joint. The IMC layer acts as a cathode to accelerate the corrosion of the FZ and as an anode to protect the steel from corrosion.

Funder

National Natural Science Foundation of China

Class III Peak Discipline of Shanghai—Materials Science and Engineering

FCT—Fundação para a Ciência e a Tecnologia

Associate Laboratory Institute of Nanostructures, Nanomodelling, and Nanofabrication—i3N

Publisher

MDPI AG

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