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

IF 2.3 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Anti-corrosion Methods and Materials Pub Date : 2024-04-24 DOI:10.1108/acmm-02-2024-2968

Dejing Zhou, Yanming Xia, Zhiming Gao, Wenbin Hu

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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.

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钎焊和人工老化对四层铝合金复合材料腐蚀和强化行为的影响

目的本研究旨在探讨钎焊和老化对新型多层板（AA4045/AA7072/AA3003M/AA4045）的强化和腐蚀行为的影响机理。设计/方法/途径采用极化曲线测试、浸泡实验和透射电子显微镜分析等方法研究钎焊和老化前后板材的腐蚀行为和拉伸性能。结果钎焊后板材的强度因脆性共晶相而减弱，而老化后又因 AA7072 夹层的沉淀强化而恢复。由于金属间化合物颗粒与基体之间存在明显的电偶效应，因此非钎焊板材的核心无法得到保护。钎焊和时效处理促进了第二相的再溶解，并限制了堆焊层中共晶区的腐蚀，从而使芯部得到保护。提出了该板材的强化和腐蚀机理。添加的中间层可以牺牲芯材免受腐蚀，并提高老化处理后的强度。

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来源期刊

Anti-corrosion Methods and Materials 工程技术-冶金工程

CiteScore

2.80

自引率

16.70%

发文量

审稿时长

13.5 months

期刊介绍： Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.