回归时间对<strong>2024</strong>铝合金的组织和耐蚀性能的影响

doi:10.11901/1005.3093.2021.450

材料研究学报

2023, Vol. 37

Issue (4): 264-270 DOI: 10.11901/1005.3093.2021.450

研究论文

本期目录 | 过刊浏览

回归时间对2024铝合金的组织和耐蚀性能的影响

廖鸿宇, 贾咏馨, 苏睿明(

), 李广龙, 曲迎东, 李荣德

沈阳工业大学材料科学与工程学院沈阳 110870

Effect of Retrogression Times on Microstructure and Corrosion Resistance of 2024 Aluminum Alloy

LIAO Hongyu, JIA Yongxin, SU Ruiming(

), LI Guanglong, QU Yingdong, LI Rongde

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

引用本文:

廖鸿宇, 贾咏馨, 苏睿明, 李广龙, 曲迎东, 李荣德. 回归时间对2024铝合金的组织和耐蚀性能的影响[J]. 材料研究学报, 2023, 37(4): 264-270.
Hongyu LIAO, Yongxin JIA, Ruiming SU, Guanglong LI, Yingdong QU, Rongde LI. Effect of Retrogression Times on Microstructure and Corrosion Resistance of 2024 Aluminum Alloy[J]. Chinese Journal of Materials Research, 2023, 37(4): 264-270.

全文: PDF(4343 KB) HTML

摘要:

采用回归再时效处理2024铝合金并对其进行透射电镜和扫描电镜观察、硬度、晶间腐蚀和电化学腐蚀测量，研究了回归时间对2024铝合金的微观组织和耐蚀性能的影响。结果表明：经回归再时效处理的2024铝合金其主要析出强化相为S相。回归处理时间为0.2 h的合金，S相细小且呈弥散均匀分布，性能有显著的提高，硬度为147.2 HV_0.5、晶间腐蚀深度为98.5 μm、自腐蚀电位为-0.64 V、自腐蚀电流密度为0.24 μA·cm^-2、电阻值为31397 Ω·cm²。这表明，适当时间的回归处理有利于提高2024铝合金的硬度和耐蚀性。

关键词 ：金属材料, 2024铝合金, 回归再时效, 耐蚀性, 析出相

Abstract：

Good corrosion resistance of 2024 Al-alloy without reducing mechanical properties can be obtained by retrogression and re-ageing (RRA) treatment. The effect of retrogression times of 0.1 h, 0.2 h, 0.3 h, 0.4 h and 0.5 h on the microstructure and corrosion resistance of 2024 Al-alloy treated by RRA were investigated by transmission electron microscopy, scanning electron microscopy, hardness tester, intergranular corrosion test and electrochemical corrosion test. The results show that the main precipitation strengthening phase of 2024 Al-alloy by RRA treatment is S phase. When the retrogression treatment time is 0.2 h, the S phase are small and uniformly distributed, and the properties of the alloy were also significantly improved. At this time, the hardness of the alloy is 147.2 HV_0.5, the intergranular corrosion depth is 98.5 μm, the free-corrosion potential is -0.64 V, the free-corrosion current density is 0.24 μA·cm^-2, and the resistance value is 31397 Ω·cm². Therefore, the appropriate retrogression time is beneficial to improve the hardness and corrosion resistance of 2024 aluminum alloy with RRA treatment.

Key words： metallic materials 2024 aluminum alloy retrogression and re-aging corrosion resistance precipitate

收稿日期: 2021-08-13

ZTFLH:

TG146.2

基金资助:国家重点研发计划(2017YFB1104000);辽宁省自然科学基金(2021-MS-235)

作者简介: 廖鸿宇，女，2001年生，本科生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.450 或 https://www.cjmr.org/CN/Y2023/V37/I4/264

表1 实验用2024铝合金的成分(质量分数，%)

表2 不同编号试样的热处理工艺

图1 不同热处理后合金的硬度

图2 不同热处理后合金的IGC照片

表3 不同热处理后合金的IGC深度

图3 不同热处理后合金的极化曲线

表4 不同热处理后合金的极化曲线参数

图4 不同热处理后合金的Nyquist图

图5 等效电路

表5 不同热处理后合金的EIS参数

图6 不同热处理后合金的明场TEM照片

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