北京航空航天大学学报 ›› 2018, Vol. 44 ›› Issue (8): 1720-1726.doi: 10.13700/j.bh.1001-5965.2017.0583

• 论文 • 上一篇    下一篇

载荷作用下5A06铝合金焊接试样的腐蚀敏感性

王帅1, 刘慧丛1, 李卫平1, 朱立群1, 石文静2, 施丽铭2   

  1. 1. 北京航空航天大学 材料科学与工程学院, 北京 100083;
    2. 中国空间技术研究院 北京空间飞行器总体设计部, 北京 100094
  • 收稿日期:2017-09-20 修回日期:2017-11-17 出版日期:2018-08-20 发布日期:2018-08-29
  • 通讯作者: 李卫平 E-mail:daizi8429@163.com
  • 作者简介:王帅,女,硕士研究生。主要研究方向:铝合金材料的应力腐蚀敏感性;李卫平,女,博士,教授。主要研究方向:腐蚀与防护、功能涂层。

Corrosion sensitivity of 5A06 aluminum alloy welded samples under loading

WANG Shuai1, LIU Huicong1, LI Weiping1, ZHU Liqun1, SHI Wenjing2, SHI Liming2   

  1. 1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
    2. Beijing Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China
  • Received:2017-09-20 Revised:2017-11-17 Online:2018-08-20 Published:2018-08-29

摘要: 针对5A06铝合金焊接对腐蚀敏感性的影响,研究了载荷作用下的不同焊缝方向(垂直、穿越)的5A06铝合金试样在50℃的3.5% NaCl溶液中的腐蚀行为的影响和焊接接头的电化学腐蚀行为。结果表明,经过110 d的盐水溶液浸泡后,2种焊缝试样均是热影响区首先发生腐蚀,表面的腐蚀坑两侧由于材料组织的不同分别呈台阶式和韧窝状。穿越焊缝试样应力腐蚀敏感性较低,腐蚀坑顶端应力集中,有滑移台阶;垂直焊缝试样应力腐蚀敏感性较高,腐蚀坑沿焊缝贯穿试样表面,腐蚀坑两侧呈平行撕裂状态。电化学极化曲线表明,热影响区、母材区和焊缝区的自腐蚀电位分别为-1.369、-0.791和-0.740 V。

关键词: 铝合金, 载荷, 腐蚀敏感性, 焊接, 3.5%NaCl 溶液

Abstract: Aimed at the aluminum alloy welding effect on corrosion sensitivity, we have applied loading on the 5A06 aluminum alloy with the welds in different directions (vertical, cross) and studied the effects of stress loading on the corrosion behavior of the alloy in 3.5%NaCl solution at 50℃ and the electrochemical corrosion behavior of the welded joints. The results show that after being soaked for 110 days in brine solution, heat-affected zone is firstly corroded and both sides of the corrosion pits on the surface exhibited step and dimple features respectively, because of the different material structure. The stress corrosion sensitivity of the cross weld specimen is relatively low and the stress concentration exists at the corrosion pit tip with a sliding step. Vertical weld specimen has higher sensitivity to stress corrosion with the corrosion pits across the surface along the weld. Both sides of the corrosion pits on the vertical weld specimen tear parallelly. The electrochemical polarization curves indicate that the corrosion potential of the heat-affected zone, base-metal zone and weld zone are -1.369 V, -0.791 V and -0.740 V, respectively.

Key words: aluminum alloy, loading, corrosion sensitivity, welding, 3.5%NaCl solution

中图分类号: 


版权所有 © 《北京航空航天大学学报》编辑部
通讯地址:北京市海淀区学院路37号 北京航空航天大学学报编辑部 邮编:100191 E-mail:jbuaa@buaa.edu.cn
本系统由北京玛格泰克科技发展有限公司设计开发