Work

The microstructure-corrosion relationships in laser-welded dissimilar steel-to-aluminium joints

Year: 2024

Type: article

Abstract: This study investigated the corrosion behaviour of dissimilar steel-to-aluminium laser-welded conduction, and keyhole mode (partial- and full-penetration) lap joints through electrochemical techniques and advanced microstructural characterisation. The corrosion resistance of the weld was found to be higher than the base materials, primarily due to the presence of cathodic FexAly (η-Fe2Al5, θ-Fe4Al13, β-FeAl) intermetallic compounds (IMCs) with high corrosion potential. The different micro and macro-galvanic corrosion mechanisms were found at various interfaces around the weld, resulting in localised pitting corrosion. The keyhole mode welding showed improved corrosion resistance, primarily attributed to the type, size, and distribution of IMCs.

Source: npj Materials Degradation

DOI: 10.1038/s41529-024-00517-y

Authors: J. I. Ahuir-Torres, S. Jabar, P. Franciosa, D. Ceglarek, H. R. Kotadia

Institutions: Liverpool John Moores University, University of Warwick

Language: English

Topic: Advanced Welding Techniques Analysis

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,390

Funders: Liverpool John Moores University, High Value Manufacturing Catapult, Engineering and Physical Sciences Research Council