喷丸工艺对<strong>7075</strong>铝合金板材表面性能的影响

doi:10.11902/1005.4537.2024.143

中国腐蚀与防护学报

2025, Vol. 45

Issue (3): 765-772 CSTR: 32134.14.1005.4537.2024.143 DOI: 10.11902/1005.4537.2024.143

研究报告

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喷丸工艺对7075铝合金板材表面性能的影响

郑文涛¹(

), 陆飞雪¹, 都凯¹, 王志惠², 贾海龙²

^1.沈阳工业大学材料科学与工程学院沈阳 110870
^2.国网青海省电力公司电力科学研究院西宁 810000

Effect of Shot Peening on Surface Properties of 7075 Al-alloy Sheet

ZHENG Wentao¹(

), LU Feixue¹, DU Kai¹, WANG Zhihui², JIA Hailong²

^1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Electric Power Research Institute, State Grid Qinghai Electric Power Company, Xining 810000, China

引用本文:

郑文涛, 陆飞雪, 都凯, 王志惠, 贾海龙. 喷丸工艺对7075铝合金板材表面性能的影响[J]. 中国腐蚀与防护学报, 2025, 45(3): 765-772.
Wentao ZHENG, Feixue LU, Kai DU, Zhihui WANG, Hailong JIA. Effect of Shot Peening on Surface Properties of 7075 Al-alloy Sheet[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 765-772.

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摘要:

为揭示具有低粗糙度、高硬度且耐蚀喷丸表面的形成机制并指导喷丸工艺优化，对7075铝合金开展了不同喷丸工艺的实验研究，喷丸前后试样的组织观察、表面粗糙度测试及耐蚀性分析。结果表明：喷丸使材料表面产生晶粒细化和加工硬化，粗糙度和硬度随弹丸直径和压力的增加而增大；随覆盖率的增加，硬度增大，粗糙度先升后降，弹丸直径0.1 mm、压力0.3 MPa时，覆盖率300%时可使硬度达到220.7 HV，200%时粗糙度达到最小值0.623 μm；相比一次喷丸，二次喷丸明显降低粗糙度并轻微增强加工硬化，粗糙度从4.131 μm降到2.232 μm，硬度从223 HV轻微增加到227 HV，腐蚀电位从原始的-0.7276 V增至-0.6816 V，二次喷丸明显改善了耐蚀性。

关键词 ： 7075铝合金, 喷丸, 二次喷丸, 表面粗糙度, 电化学腐蚀

Abstract：

7075 Al-alloy plates of 6 mm in thickness were subjected to shot peening treatments with varying parameters. Then the effect of shot peening on the microstructure, surface-roughness and -hardness as well as corrosion performance was assessed, aiming in optimization of the shot pinning processes. The results indicated that shot peening led to grain refinement and work hardening of the shot peened surface. Both the roughness and hardness increased with the increase of the ball diameter and the injection pressure. As the repetition rate of shot peening area increased from 100% to 300%, the hardness increased, while the roughness rose firstly and then decreased. When the ball diameter was 0.1 mm and the injection pressure was 0.3 MPa, the hardness reached 220.7 HV with the repetition rate of 300%, while the roughness reached a minimum value of 0.623 μm with the repetition rate of 200%. In comparison with the single shot peening, the double shot peening may result in significant reduction in surface roughness from 4.131 μm to 2.232 μm, but in slight increment in hardness from 223 HV to 227 HV. Besides, the corrosion potential increased from -0.7276 V for the alloy before shot pinning to -0.6816 V for the alloy after twice shot pinning, indicating that the double peening can significantly enhance the corrosion resistance of the 7075 Al-alloy.

Key words： 7075 Al-alloy shot peening dual shot peening surface roughness electrochemical corrosion

收稿日期: 2024-05-06 32134.14.1005.4537.2024.143

ZTFLH:

TG146.21

基金资助:国家自然科学基金(52305396)

通讯作者: 郑文涛，E-mail：wenntaozheng@163.com，研究方向为有限元仿真应用技术、先进材料精密成形

Corresponding author: ZHENG Wentao, E-mail: wenntaozheng@163.com

作者简介: 郑文涛，男，1980年生，博士，副教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.143 或 https://www.jcscp.org/CN/Y2025/V45/I3/765

表1 喷丸工艺参数及处理样表面粗糙度和硬度

图1 不同覆盖率喷丸强化后7075铝合金的表面形貌

图2 二次喷丸强化前后7075铝合金的表面形貌

图3 喷丸前后7075铝合金的金相显微组织

图4 喷丸前后7075铝合金的XRD谱

图5 原始以及经过一次、二次喷丸处理的7075铝合金的极化曲线

表2 原始以及经过一次、二次喷丸处理的7075铝合金的极化曲线的拟合结果

图6 原始以及经过一次、二次喷丸处理的7075铝合金的Nyquist图

图7 等效电路图

表3 EIS等效电路拟合结果

图8 电化学腐蚀后未喷丸和二次喷丸样品的表面形貌及腐蚀产物EDS分析结果

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