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

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Materials Degradation Pub Date : 2024-10-11 DOI:10.1038/s41529-024-00517-y

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

引用次数: 0

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.

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激光焊接异种钢铝接头的微观结构-腐蚀关系

本研究通过电化学技术和先进的微结构表征方法，研究了异种钢铝激光焊接传导接头和锁孔模式（部分穿透和完全穿透）搭接接头的腐蚀行为。研究发现，焊缝的耐腐蚀性高于母材，这主要是由于存在具有高腐蚀电位的阴极 FexAly（η-Fe2Al5、θ-Fe4Al13、β-FeAl）金属间化合物（IMC）。在焊缝周围的不同界面上发现了不同的微观和宏观电化学腐蚀机制，从而导致局部点蚀。锁孔模式焊接显示出更强的耐腐蚀性，这主要归因于 IMC 的类型、尺寸和分布。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.80

自引率

7.80%

发文量

审稿时长

6 weeks

期刊介绍： npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies