超声喷丸对<strong>7075</strong>铝合金棒材组织结构与性能的影响

doi:10.11902/1005.4537.2022.415

中国腐蚀与防护学报

2023, Vol. 43

Issue (6): 1293-1302 CSTR: 32134.14.1005.4537.2022.415 DOI: 10.11902/1005.4537.2022.415

研究报告

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超声喷丸对7075铝合金棒材组织结构与性能的影响

刘浩¹, 郭晓开¹, 王维², 伍廉奎¹, 曹发和¹, 孙擎擎¹(

)

^1.中山大学材料学院深圳 518107
^2.松山湖材料实验室东莞 523808

Effect of Ultrasonic Shot Peening on Microstructure and Properties of a 7075 Al-alloy Rod

LIU Hao¹, GUO Xiaokai¹, WANG Wei², WU Liankui¹, CAO Fahe¹, SUN Qingqing¹(

)

^1.School of Materials, Sun Yat-sen University, Shenzhen 518107, China
^2.Songshan Lake Materials Laboratory, Dongguan 523808, China

引用本文:

刘浩, 郭晓开, 王维, 伍廉奎, 曹发和, 孙擎擎. 超声喷丸对7075铝合金棒材组织结构与性能的影响[J]. 中国腐蚀与防护学报, 2023, 43(6): 1293-1302.
Hao LIU, Xiaokai GUO, Wei WANG, Liankui WU, Fahe CAO, Qingqing SUN. Effect of Ultrasonic Shot Peening on Microstructure and Properties of a 7075 Al-alloy Rod[J]. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1293-1302.

全文: PDF(9850 KB) HTML

摘要:

研究了超声喷丸对7075铝合金棒材微观组织结构、显微硬度、电化学腐蚀以及晶间腐蚀行为的影响。金相、XRD以及TEM等结果表明，采用超声喷丸制备了表层晶粒尺寸约为78.2 nm的梯度纳米结构7075铝合金，且合金表层时效析出强化相 (η和η′相) 回溶基体。显微硬度结果表明，超声喷丸处理后合金表层硬度提升了约20%。在0.1 mol/L Na₂SO₄+20 mmol/L NaCl溶液中的极化曲线结果表明，合金在超声喷丸处理后点蚀电位正移，说明合金耐点蚀萌生能力增强。在3.5%NaCl溶液中的极化曲线与电化学阻抗谱结果表明，7075铝合金棒材在超声喷丸处理后腐蚀速率加快，且腐蚀速率在深度方向上呈递减趋势。晶间腐蚀浸泡实验表明7075铝合金在超声喷丸处理后耐晶间腐蚀能力降低。最后，讨论了超声喷丸7075铝合金棒材的表层强化机制与腐蚀机理。

关键词 ： 7075铝合金棒材, 表面纳米化, 显微硬度, 腐蚀行为

Abstract：

The effect of ultrasonic shot peening (USSP) on microstructure, microhardness, electrochemical corrosion and intergranular corrosion behavior of a 7075 Al-alloy rod were investigated by means of optical microscopy (OM), X-ray diffraction (XRD), transmission electron microscope (TEM) and corrosion tests.Results showed that after USSP treatment, gradient nanostructures were obtained in the topmost layer with grain size of ~78.2 nm; the precipitated strengthening phases (η and η′ phase) of surface region redissolved into Al matrix, and the hardness of surface layer increased by about 20%. Results of polarization test in 0.1 mol/L Na₂SO₄+20 mmol/L NaCl solution showed that pitting potential of the alloy shifted to the positive directipn position after USSP, implying a better resistance against pitting corrosion initiation. Electrochemical corrosion tests in 3.5%NaCl solution indicated that a higher corrosion rate of 7075 Al-alloy was obtained after USSP treatment. In addition, the corrosion rate showed a decreasing trend as a function of peened sample depth. Intergranular corrosion immersion tests showed that the resistance to intergranular corrosion of AA7075 decreased after USSP treatment. Combined with the microstructure characterization results, the surface strengthening mechanism and corrosion mechanism of ultrasonic shot peened 7075 Al-alloy were discussed.

Key words： 7075 Al-alloy rod surface nanocrystallization microhardness corrosion behaviors

收稿日期: 2022-12-30 32134.14.1005.4537.2022.415

ZTFLH:

TG174

基金资助:松山湖材料实验室开放课题基金(2021SLABFN13);国家自然科学基金(52101115)

通讯作者: 孙擎擎，E-mail: sunqq7@mail.sysu.edu.cn，研究方向为金属使役行为

Corresponding author: SUN Qingqing, E-mail: sunqq7@mail.sysu.edu.cn

作者简介: 刘浩，男，2000年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2022.415 或 https://www.jcscp.org/CN/Y2023/V43/I6/1293

图 1 超声喷丸处理装置示意图

图2 不同冲击距离的超声喷丸7075铝合金截面金相图片

图3 7075铝合金棒材的平均晶粒尺寸

图4 7075铝合金棒材在超声喷丸处理前后的XRD

图5 超声喷丸处理后7075铝合金棒材表层约5 μm处的TEM结果

图6 超声喷丸处理后7075铝合金棒材的硬度-深度曲线

图7 未处理样和不同冲击距离7075铝合金喷丸样在0.1 mol/L Na2SO4+20 mmol/L NaCl溶液中的开路电位-时间曲线与极化曲线

表1 未处理样和不同冲击距离7075铝合金喷丸样的极化曲线参数

图8 7075铝合金未处理样和喷丸样在3.5%NaCl溶液中的开路电位-时间曲线和极化曲线

表2 7075铝合金棒材未处理样和喷丸样在3.5%NaCl溶液中极化曲线的参数

图9 7075铝合金未处理样和喷丸样在3.5%NaCl溶液中的EIS结果

表3 图9中EIS的拟合结果

图10 7075铝合金在晶间腐蚀测试后的截面光镜形貌

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