Effect of homogenization and precipitation heat treatments on localized corrosion of Al–Mn–Zr alloy with Fe impurity

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Pub Date : 2023-05-01 DOI:10.5006/4319

Y. So, Jeong-Min Lim, T. Nguyen, Jung-Gu Kim

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Abstract

This study aimed to enhance the corrosion resistance of an Al–Mn–Zr alloy containing Fe impurities by employing heat treatment processes. Three processes were implemented to distribute intermetallic particles uniformly, promote Al6(Mn, Fe) and Al3Zr particle formation, and eliminate Fe and Zr segregation. Increasing the amount of Al6(Mn, Fe) reduced the galvanic effect between Al matrix and Al3Fe particles, leading to improved localized corrosion resistance. Al3Zr promoted smaller grain size by preventing recrystallization. Microstructure analysis confirmed the inhibitory effect on grain growth and the promotion of Al6(Mn, Fe) and Al3Zr particle formation. The effect of grain size on galvanic corrosion was evaluated through corrosion simulation. Furthermore, the improved localized corrosion resistance was evaluated through electrochemical and immersion tests. Consequently, the designed heat treatment process significantly improved the localized corrosion resistance of the Al–Mn–Zr alloy with Fe impurities. These results demonstrate the effectiveness of the employed heat treatment processes in improving the corrosion resistance of the alloy.

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均匀化和沉淀热处理对含铁Al-Mn-Zr合金局部腐蚀的影响

本研究旨在通过热处理工艺提高含铁Al-Mn-Zr合金的耐蚀性。采用三种工艺均匀分布金属间颗粒，促进Al6(Mn, Fe)和Al3Zr颗粒的形成，消除Fe和Zr的偏析。增加Al6(Mn, Fe)的含量，降低了Al基体与Al3Fe颗粒之间的电偶效应，提高了局部耐蚀性。Al3Zr通过防止再结晶而减小晶粒尺寸。显微组织分析证实了其抑制晶粒生长和促进Al6(Mn, Fe)和Al3Zr颗粒形成的作用。通过腐蚀模拟，评价了晶粒尺寸对电偶腐蚀的影响。此外，通过电化学和浸渍试验对改进后的耐局部腐蚀性能进行了评价。因此，所设计的热处理工艺显著提高了含铁Al-Mn-Zr合金的局部耐蚀性。这些结果表明，所采用的热处理工艺在提高合金的耐腐蚀性方面是有效的。

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 MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion. 70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities. Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives: • Contribute awareness of corrosion phenomena, • Advance understanding of fundamental process, and/or • Further the knowledge of techniques and practices used to reduce corrosion.