锻压技术

塑性变形对2024铝合金拼焊接头腐蚀性能的影响

英文标题：Influence of plastic deformation on corrosion performance for 2024 aluminum alloy tailored welded joint

作者：赵满1 2 孙倩1 2 庞秋3 胡志力1 2 4

单位：1.武汉理工大学现代汽车零部件技术湖北省重点实验室 2.武汉理工大学汽车零部件技术湖北省协同创新中心武汉东湖学院机电工程学院 4.武汉理工大学湖北省新能源与智能网联车工程技术研究中心

关键词：塑性变形 2024铝合金搅拌摩擦焊拼焊接头微观结构腐蚀性能

分类号：

出版年,卷(期):页码：2022,47(3):198-205

摘要：

为研究变形程度对铝合金搅拌摩擦焊（FSW）接头腐蚀性能的影响规律。采用单向拉伸试验，通过Tafel极化曲线及剥落腐蚀试验研究不同程度的塑性变形量对2024铝合金FSW接头焊核腐蚀性能的影响，利用金相显微镜（OM）、扫描电镜（SEM/EDS）等观察得到的显微组织来表征试验结果并分析其影响腐蚀性能的机理。结果表明：在变形量为0%、4%、7%和10%的塑性变形中，耐腐蚀性依次为：变形量为0%的试样>变形量为7%的试样>变形量为10%的试样>变形量为4%的试样，在塑性变形量为7%处出现“拐点”。随着塑性变形量的增大，位错及位错环增多，包围缠绕的析出相增多，耐腐蚀性随之提高；但大的变形会使塑性变形量为10%的试样上出现微裂纹，容易被腐蚀，导致耐腐蚀性有所下降。

In order to study the influence laws of deformation degree on the corrosion performance of friction stir welding (FSW) joint for aluminum alloy, using uniaxial tensile tests, the influences of plastic deformation amount in different degrees on the corrosion performance of 2024 aluminum alloy FSW joint were studied by Tafel polarization curve and exfoliation corrosion test, and the test results were characterized by the microstructures observed by optical microscope (OM) and scanning electron microscope (SEM/EDS) to analyze the mechanism of its influence on the corrosion performance. The results show that in the plastic deformation amount of 0%, 4%, 7% and 10%, the corrosion resistance performance of FSW joint is as follows: the sample with deformation of amount 0%> the sample with deformation of amount 7%> the sample with deformation amount of 10%> the sample with deformation amount of 4%. An “inflection point” appears at the plastic deformation amount of 7%. With the increasing of plastic deformation amount, the number of dislocations and dislocation rings increases, the number of precipitation phases surrounding and winding increases, and the corrosion resistance performance also increases. However, large deformation causes micro-cracks on the sample with plastic deformation amount of 10%, which is easy to be corroded, resulting in a decrease in the corrosion resistance performance.

基金项目：

国家自然科学基金资助项目（51775397）；湖北省重点研发计划项目（2020BAB140）；武汉市科技成果转化专项（2019030703011511）；湖北省教育厅科学研究计划项目（B2020245）

赵满（1996-），女，硕士研究生 E-mail：manzhao0112@163.com 通信作者：庞秋（1979-），女，博士，硕士生导师，副教授 E-mail：pqiuhit@126.com

参考文献：

[1]Merklein M, Johannes M, Lechner M, et al. A review on tailored blanks-production, applications and evaluation [J]. Journal of Materials Processing Technology, 2014, 214 (2): 151-164.

[2]胡志力, 范新欣, 华林. 高强铝合金FSW拼焊板变形规律与成形技术 [J]. 机械工程学报, 2020, 56(6):206-212.

Hu Z L, Fan X X, Hua L. Forming theory and technology of aluminum alloy FSW tailor welded blank[J]. Journal of Mechanical Engineering, 2020, 56(6):206-212.

[3]Hu Z L, Wang X S, Pang Q, et al. The effect of postprocessing on tensile property and microstructure evolution of friction stir welding aluminum alloy joint [J]. Materials Characterization, 2015, 99: 180-187.

[4]Pang Q, Zhang J H, Huq M J, et al. Characterization of microstructure, mechanical properties and formability for thermomechanical treatment of friction stir welded 2024-O alloys [J]. Materials Science & Engineering A, 2019, 765:138303.

[5]Threadgill P, Leonard A, Shercliff H, et al. Friction stir welding of aluminium alloys [J]. International Materials Reviews, 2009, 54: 49-93.

[6]Huang Y X, Wan L, Lyu S, et al. New technique of in situ rolling friction stir welding [J]. Science and Technology of Welding and Joining, 2012, 17 (8): 636-642.

[7]Rambabu G, Naik D B, Rao C H V, et al. Optimization of friction stir welding parameters for improved corrosion resistance of AA2219 aluminum alloy joints [J]. Defence Technology, 2015, 11 (4): 330-337.

[8]Sinhmar S, Dwivedi D K D. Effect of weld thermal cycle on metallurgical and corrosion behavior of friction stir weld joint of AA2014 aluminium alloy [J]. Journal of Manufacturing Processes, 2019, 37: 305-320.

[9]GB/T 288.1—2010, 金属材料拉伸试验第1部分：室温试验方法[S].

GB/T 288.1—2010, Metallic materials—Tensile testing—Part1: Method of test at room temperature[S].

[10]GB/T 22639—2008, 铝合金加工产品的剥落腐蚀试验方法[S].

GB/T 22639—2008, Test method of exfoliation corrosion for wrought aluminium and aluminium alloys[S].

[11]Xu W F, Liu J H, Zhu H Q. Pitting corrosion of friction stir welded aluminum alloy thick plate in alkaline chloride solution [J]. Electrochimica Acta, 2010, 55: 2918-2923.

[12]Song F X, Zhang X M, Liu S D, et al. Effects of pre-stretching on corrosion resistance of 7050 aluminum alloy [J]. Journal of Central South University:Science and Technology, 2013, 44 (5): 1791-1797.

[13]Mccafferty E. Introduction to Corrosion Science [M]. New York: Springer Science & Business Media, 2010.

[14]Zhang H, Sun D, Ma F, et al. Exfoliation corrosion mechanism of friction stir welded 2219 aluminum alloy [J]. Rare Metal Materials and Engineering, 2015, 44: 103-107.

[15]Jariyaboon M, Davenport A J, Ambat R, et al. The effect of welding parameters on the corrosion behaviour of friction stir welded AA2024-T351 [J]. Corrosion Science, 2007, 49 (2): 877-909.

[16]Lu Y L, Wang J, Li W, et al. Effects of pre-deformation on the microstructures and corrosion behavior of 2219 aluminum alloys [J]. Materials Science & Engineering A, 2018, 723: 204-211.

[17]郭晓娟, 董春林, 康举, 等. 搅拌摩擦焊搭接界面缺陷初步研究 [A] . 中国机械工程学会. 第十五次全国焊接学术会议论文集[C]. 西宁: 中国机械工程学会, 2010 .

Guo X J, Dong C L, Kang J, et al. A preliminary study on the interface defects of friction stir welding [A] . Chinese Mechanical Engineering Society. Proceedings of the 15th National Welding Academic Conference[C]. Xining: Chinese Mechanical Engineering Society, 2010.

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