Revealing the mechanisms of exfoliation corrosion and stress corrosion cracking for an Al-Zn-Mg-Cu alloy after continuous retrogression and re-ageing treatment

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2024-09-20 DOI:10.1016/j.corsci.2024.112474

Benshi He , Xiaodong Wu , Lingfei Cao , Songbai Tang , Yurong Yang , Yan Zou

引用次数: 0

Abstract

Continuous retrogression and re-ageing (CRRA) treatment is designed to achieve an optimal balance between the strength and corrosion performance of an Al-Zn-Mg-Cu alloy. The findings suggest that intergranular corrosion predominantly affects the T6 sample, with extensive propagation into the bulk resulting in delamination and intergranular cracking. In contrast, crystallographic pitting dominates in the CRRA-treated sample, which effectively mitigates exfoliation corrosion and suppresses intergranular cracking. The different corrosion resistance between the T6 sample and the CRRA-treated sample is attributed to the disparate distribution of Cu in the alloy, which influences the corrosion rate, the types of corrosion and corrosion propagation path.

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揭示一种铝-锌-镁-铜合金在连续退火和再时效处理后发生剥落腐蚀和应力腐蚀开裂的机理

连续退火和再时效（CRRA）处理旨在实现铝锌镁铜合金强度和腐蚀性能之间的最佳平衡。研究结果表明，晶间腐蚀主要影响 T6 样品，其广泛的扩展会导致脱层和晶间开裂。相比之下，经 CRRA 处理的试样主要发生晶间点蚀，从而有效减轻了剥离腐蚀并抑制了晶间开裂。T6 样品和 CRRA 处理过的样品之间不同的耐腐蚀性归因于合金中不同的铜分布，这影响了腐蚀速率、腐蚀类型和腐蚀传播路径。

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

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.