Improving the resistance of exfoliation corrosion and stress corrosion cracking for high-strength aluminum alloy via tailored nanoparticles

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

Corrosion Science Pub Date : 2025-09-19 DOI:10.1016/j.corsci.2025.113335

Yifu Jiang , Siyang Xu , Jinhua Zhou , Xiulu Zhang , Xiaowei Yin , Jie Hao

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引用次数: 0

Abstract

High-strength aluminum alloys have emerged as a focal point in materials research due to their exceptional potential for sustainable industrial applications. This study introduces a pre-aging and electric pulse treatment (EPT) following hot compression with 100 ℃ dies to achieve the balance of mechanical properties and corrosion resistance via tailored nanoparticles. Our findings demonstrate that EPT accelerated precipitation process due to its thermal effect and athermal effect. The specimen after EPT exhibited the excellent corrosion resistance, and the thick oxide layer, uniformly distributed η´ and large-sized grain boundary precipitation (GBP) with high Cu content enable to weaken the anodic dissolution, thus decreasing the corrosion rate. Comparing to the specimens in baking treatment condition, the corrosion morphology changes from intergranular corrosion (IGC)/IGC+local IGC to weak local IGC. Besides, the increasing die temperature and the application of EPT promote the improvement of stress corrosion cracking (SCC). The formation of T phase induced by EPT causes the hydrogen repartitioning, significantly enhancing the SCC resistance through decreasing the H accumulation at vulnerable microstructural sites.

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通过定制纳米颗粒提高高强铝合金的抗剥落腐蚀和应力腐蚀开裂能力

高强度铝合金因其在可持续工业应用方面的特殊潜力而成为材料研究的焦点。本研究介绍了100℃模具热压缩后的预时效和电脉冲处理（EPT），通过定制纳米颗粒实现机械性能和耐腐蚀性的平衡。结果表明，EPT的热效应和非热效应加速了降水过程。经EPT处理后的试样具有优异的耐蚀性，较厚的氧化层、均匀分布的η´ 和高Cu含量的大晶粒晶界析出（GBP）能够减弱阳极溶解，从而降低腐蚀速率。与烘烤处理试样相比，腐蚀形态由晶间腐蚀(IGC)/IGC+局部IGC转变为弱局部IGC。此外，模具温度的升高和EPT的应用促进了应力腐蚀开裂（SCC）的改善。EPT诱导的T相的形成引起氢的重新分配，通过减少H在脆弱微结构部位的积累，显著增强了抗SCC能力。

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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.