Effect of Thermal-Cold Cycling Treatment on the Microstructure and Corrosion Resistance of 7075-T83 Aluminum Alloy

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

JOM Pub Date : 2024-08-07 DOI:10.1007/s11837-024-06794-x

Kunze Li, Weijian Zhang, Ling Shi, Ruiming Su, Tongyu Liu, Guanglong Li

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Abstract

The enhancement of the mechanical properties of an alloy is often accompanied by a decrease in corrosion resistance. Therefore, in this paper, thermal-cold cycling (TCC) treatment was used to process 7075-T83 aluminum alloy to improve its corrosion resistance on the basis of ensuring its mechanical properties. Intergranular corrosion (IGC) and electrochemical tests combined with transmission electron microscopy observation were carried out to investigate the effect of TCC treatment on the microstructure and corrosion resistance of the 7075-T83 aluminum alloy. The results showed that the corrosion resistance of the alloy was significantly improved and the microstructure was well optimized after two TCC treatments. The IGC depth of the alloy was the shallowest, at 25.8 μm, and the corrosion current density and corrosion rate reached the minimum values of 0.00148 mA/cm² and 0.0484 mm/a, respectively. In addition, the average diameter of the matrix precipitates was the smallest, the volume fraction was the highest, the thickness of the passive film formed on the surface of the alloy was the thickest, reaching 3.81 nm, which effectively resisted the erosion of Cl⁻, while the agglomeration and coarsening of the grain boundary precipitates and the size and the distance between them increased, exhibiting a discontinuous distribution, which blocked the anodic corrosion channel and hindered the corrosion progress, thus improving the corrosion resistance of the alloy.

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热冷循环处理对 7075-T83 铝合金微观结构和耐腐蚀性的影响

合金机械性能的提高往往伴随着耐腐蚀性能的降低。因此，本文采用热冷循环（TCC）处理方法对 7075-T83 铝合金进行加工，在保证其机械性能的基础上提高其耐腐蚀性。通过晶间腐蚀（IGC）和电化学测试，结合透射电子显微镜观察，研究了 TCC 处理对 7075-T83 铝合金微观结构和耐腐蚀性能的影响。结果表明，经过两次 TCC 处理后，合金的耐腐蚀性明显改善，微观结构也得到了很好的优化。合金的 IGC 深度最浅，为 25.8 μm，腐蚀电流密度和腐蚀速率分别达到 0.00148 mA/cm2 和 0.0484 mm/a 的最小值。此外，基体析出物的平均直径最小，体积分数最高，在合金表面形成的被动膜厚度最厚，达到 3.81 nm，有效地抵抗了 Cl- 的侵蚀，而晶界析出物的团聚和粗化、尺寸和间距增大，呈现出不连续分布，堵塞了阳极腐蚀通道，阻碍了腐蚀进程，从而提高了合金的耐腐蚀性。

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

JOM 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.80%

发文量

540

审稿时长

2.8 months

期刊介绍： JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.