工业大气环境对Al-Mg-Si合金腐蚀疲劳特性的影响

doi:10.11902/1005.4537.2021.043

中国腐蚀与防护学报

2021, Vol. 41

Issue (4): 501-507 DOI: 10.11902/1005.4537.2021.043

研究报告

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工业大气环境对Al-Mg-Si合金腐蚀疲劳特性的影响

孙晓光¹^,², 王子晗², 徐学旭²(

), 韩晓辉¹, 李刚卿¹, 刘智勇²

^1.中车青岛四方机车车辆股份有限公司技术工程部青岛 266111
^2.北京科技大学腐蚀与防护中心北京 100083

Effect of Industrial Atmospheric Environment on Corrosion Fatigue Behavior of Al-Mg-Si Alloy

SUN Xiaoguang¹^,², WANG Zihan², XU Xuexu²(

), HAN Xiaohui¹, LI Gangqing¹, LIU Zhiyong²

^1.Technical Engineering Department, CRRC Qingdao Sifang Co. LTD. , Qingdao 266111, China
^2.Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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摘要:

使用力学性能测试、轴向力加载疲劳测试、扫描电子显微镜、电化学测试等手段，研究了模拟工业大气环境中Al-Mg-Si合金母材及其焊接接头的腐蚀疲劳特征。结果表明：Al-Mg-Si合金对接焊接接头的力学性能低于母材，而且在模拟工业大气环境中更易腐蚀。焊接接头的腐蚀疲劳敏感性更高，原因是其焊接缺陷处容易成为腐蚀疲劳裂纹优先萌生的区域，最终导致试样在焊缝区域发生疲劳断裂。

关键词 ： Al-Mg-Si合金, 焊接接头, 腐蚀疲劳特征, 模拟工业大气

Abstract：

The corrosion fatigue characteristics of the Al-Mg-Si alloy and its butt welded joints in a simulated industrial atmosphere are studied by means of mechanical performance test, axial force loading fatigue test, scanning electron microscope, electrochemical test and other methods. The results show that the mechanical properties of butt-welded joints of Al-Mg-Si alloy are lower than that of the base metal, and the welded joints are more prone to corrosion in the simulated industrial atmosphere. The corrosion fatigue sensitivity of welded joints is higher, the corrosion fatigue cracks of the base metal initiate from corrosion pits at grain boundaries, while the fatigue cracks of the welded joints initiate easily at the locations rich in welding defects and inclusions of the weld seam. The existence of large number of welding defects and Al₂O₃ inclusions introduced during the welding process may be responsible to why the corrosion fatigue performance of the welded joints of Al-Mg-Si alloy is lower than that of the base metal. Besides, the presence of inclusions will induce stress concentration, and around which high-density lattice distortion areas will also emerge. These areas will act as anodes to be preferentially dissolved and thereby, where to become the priority area of corrosion fatigue crack initiation, eventually lead to fatigue fracture of the test piece. Therefore, for the actual production, the forming process and welding process should be optimized, and the number of welding defects and inclusions should be controlled, so as to improve the corrosion fatigue performance of the alloy.

Key words： Al-Mg-Si alloy welded joint corrosion fatigue characteristic simulated industrial atmosphere

收稿日期: 2021-03-08

ZTFLH:

TG174

基金资助:国家自然科学基金(52071017);国家重点研发计划(2017YFB0702300)

通讯作者: 徐学旭 E-mail: xuxuexu1992@163.com

Corresponding author: XU Xuexu E-mail: xuxuexu1992@163.com

作者简介: 孙晓光，男，1984年生，博士，高级工程师

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引用本文:

孙晓光, 王子晗, 徐学旭, 韩晓辉, 李刚卿, 刘智勇. 工业大气环境对Al-Mg-Si合金腐蚀疲劳特性的影响[J]. 中国腐蚀与防护学报, 2021, 41(4): 501-507.
Xiaoguang SUN, Zihan WANG, Xuexu XU, Xiaohui HAN, Gangqing LI, Zhiyong LIU. Effect of Industrial Atmospheric Environment on Corrosion Fatigue Behavior of Al-Mg-Si Alloy. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 501-507.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.043 或 https://www.jcscp.org/CN/Y2021/V41/I4/501

图1 Al-Mg-Si合金焊接接头宏观形貌

图2 Al-Mg-Si合金母材及焊接接头的应力-应变拉伸曲线

图3 Al-Mg-Si合金母材及焊接接头的极化曲线和电化学阻抗谱

图4 Al-Mg-Si合金母材及焊接接头电化学阻抗谱的拟合电路图

表1 Al-Mg-Si合金母材及焊接接头的电化学腐蚀参数

图5 Al-Mg-Si合金母材及焊接接头在模拟工业大气中的疲劳周次-峰值应力柱状图

图6 Al-Mg-Si合金母材及焊接接头试样在模拟工业大气中腐蚀疲劳实验后的宏观形貌

图7 Al-Mg-Si合金母材及焊接接头在150和80 MPa下模拟工业大气环境中腐蚀疲劳断口的微观形貌

图8 Al-Mg-Si合金焊接接头在模拟工业大气中80 MPa下的腐蚀疲劳断口侧面形貌及EDS谱

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