人工时效对7075铝合金微观腐蚀行为的影响

doi:10.13251/j.issn.0254-6051.2024.02.023

金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 153-158.DOI: 10.13251/j.issn.0254-6051.2024.02.023

人工时效对7075铝合金微观腐蚀行为的影响

汤慧珍¹, 王帅¹, 燕丽娟¹, 张永超¹, 沈俊^2,3, 葛炳辉¹

1.安徽大学物质科学与信息技术研究院, 安徽合肥 230601;
2.魏桥国科(滨州)科学工程产业技术研究院有限公司, 山东滨州 256600;
3.中国科学院重庆绿色智能技术研究院, 重庆 400714

收稿日期:2023-08-27 修回日期:2023-12-19 出版日期:2024-03-27 发布日期:2024-03-27
通讯作者: 张永超,讲师,E-mail: yczhang@ahu.edu.cn
作者简介:汤慧珍(1996—),女,硕士研究生,主要研究方向为铝合金材料,E-mail:q20301246@stu.ahu.edu.cn。
基金资助:
国家自然科学基金(52101002,11874394);安徽省高校协同创新计划(GXXT-2020-003)

Effect of artificial aging on micro-corrosion behavior of 7075 aluminum alloy

Tang Huizhen¹, Wang Shuai¹, Yan Lijuan¹, Zhang Yongchao¹, Shen Jun^2,3, Ge Binghui¹

1. Institutes of Physical Science and Information Technology, Anhui University, Hefei Anhui 230601, China;
2. WQ&UCAS (Binzhou) Industrialization Research Institute Co., Ltd., Binzhou Shandong 256600, China;
3. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China

Received:2023-08-27 Revised:2023-12-19 Online:2024-03-27 Published:2024-03-27

摘要/Abstract

摘要： 通过腐蚀电化学测量、扫描电镜、透射电镜和EDS元素分析,研究了时效时间对7075铝合金腐蚀行为的影响。结果表明,在120 ℃下时效6 h的合金试样较时效2、12、24 h的合金试样自腐蚀电位更正,腐蚀驱动力更小,合金更不易发生腐蚀。随着时效时间的增加,合金整体腐蚀形貌由晶间腐蚀转变为点蚀。利用透射电镜观察合金基体早期腐蚀形貌发现,时效6 h的合金表面呈现均匀分布的腐蚀浅坑,而时效24 h试样则呈现小而深的点蚀,基体溶质元素分布均匀程度对合金腐蚀行为有较大影响。

关键词: 7075铝合金, 人工时效, 腐蚀形貌, 析出相

Abstract: Effect of aging time on corrosion behavior of the 7075 aluminum alloy was investigated by means of corrosion electrochemical measurements, scanning electron microscope, transmission electron microscope and EDS elemental analysis. The results show that the specimen aged for 6 h at 120 ℃ has a higher self-corrosion potential and a lower corrosion driving force than the specimens aged for 2, 12 and 24 h, and the alloy aged for 6 h is less prone to corrosion. As the aging time increases, the overall corrosion profile of the alloy changes from intergranular corrosion to pit corrosion. Through the early corrosion morphologies of the substrate observed by using transmission electron microscope, the alloy aged for 6 h shows uniformly distributed shallow corrosion hollows on the surface, while the alloy aged for 24 h shows deep corrosion pits. The uniform distribution extent of solute elements in the substrate has a significant impact on the pitting behavior of the alloy.

Key words: 7075 aluminum alloy, artificial aging, corrosion morphology, precipitated phase

中图分类号:

TG146.2⁺1

汤慧珍, 王帅, 燕丽娟, 张永超, 沈俊, 葛炳辉. 人工时效对7075铝合金微观腐蚀行为的影响[J]. 金属热处理, 2024, 49(2): 153-158.

Tang Huizhen, Wang Shuai, Yan Lijuan, Zhang Yongchao, Shen Jun, Ge Binghui. Effect of artificial aging on micro-corrosion behavior of 7075 aluminum alloy[J]. Heat Treatment of Metals, 2024, 49(2): 153-158.

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人工时效对7075铝合金微观腐蚀行为的影响

Effect of artificial aging on micro-corrosion behavior of 7075 aluminum alloy

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