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| 5052铝合金胶接-磁脉冲焊接复合接头盐雾腐蚀性能研究 |
| Research on Salt Spray Corrosion Performance of Magnetic Pulse Weld Bonding Joint of 5052 Aluminum Alloy |
| Received:April 28, 2021 |
| DOI：10.3969/j.issn.1674-6457.2021.04.011 |
| 中文关键词: 5052铝合金板 胶接-磁脉冲焊接 盐雾腐蚀 |
| 英文关键词: 5052 aluminum alloy plate magnetic pulse weld bonding salt spray corrosion |
| 基金项目:国家自然科学基金(51975202);湖南省自然科学基金优秀青年科学基金(2019JJ30005) |
| Author Name | Affiliation | | HAN Zi-chuan | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | LIU Quan-xiao-xiao | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | PENG Ding-chen | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | LI Guang-yao | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | CUI Jun-jia | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China |
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| 中文摘要: |
| 目的 研究5052铝合金板胶接-磁脉冲焊接复合接头的抗腐蚀性能和腐蚀路径。方法 以AA5052铝合金板为研究对象，选用胶接-磁脉冲焊接复合工艺进行连接，并在35 ℃、质量分数为5%的氯化钠溶液中对样件进行中性盐雾腐蚀试验6~18 d，之后对接头的剪切性能进行测试，再结合SEM对接头的腐蚀路径进行分析。结果 在中性盐雾腐蚀试验中，腐蚀时间增加，磁脉冲点焊接头和胶焊复合接头的质量损失率均增大，峰值载荷下降，且腐蚀6~12 d阶段内质量损失率和性能衰退均放缓。经过18 d的盐雾腐蚀后，胶焊复合接头的峰值载荷下降了6.4%，而磁脉冲点焊接头则下降了23.1%。胶层能延缓胶焊复合接头的力学性能衰退，起到一定的防腐蚀作用。结论 在中性盐雾腐蚀试验中，胶焊复合接头中的胶层可吸收盐雾液滴并阻碍其渗透，并延缓接头的力学性能衰退。盐雾液滴的腐蚀路径为:在磁脉冲点焊接头中，大部分盐雾液滴渗透进入变形区的凹槽，而在胶焊复合接头中盐雾液滴会被胶层吸收一部分。随着盐雾腐蚀的进行，盐雾液滴会逐渐穿透胶层，降低胶粘剂和母材之间的嵌合力以及胶粘剂之间的内聚力。此外，少部分盐雾液滴流动至焊缝外侧，逐渐向焊缝内侧浸入，并溶解焊缝周围的金属，造成点蚀区局部连通的现象。 |
| 英文摘要: |
| The purpose of this article is to study the corrosion resistance and corrosion path of the 5052 aluminum alloy plate magnetic pulse weld bonding (MPWB). The sample was placed in sodium chloride solution with a mass fraction of 5% at 35 ℃ for salt spray corrosion test. After 6-18 days, the shear performance degradation of the joint was tested, and the corrosion path of the joint was analyzed according to SEM. In the neutral salt spray corrosion test, the corrosion time increases, the mass loss rate of the MPW joint and MPWB joint both increase, the peak load decreases, and the mass loss rate and performance decline in the 6-12 d stage of corrosion are both slow down. After 18 days of neutral salt spray corrosion, the peak load of MPW joint dropped by 23.1%, while the peak load of MPWB dropped by 6.4%. In the neutral salt spray corrosion test, compared with magnetic pulse welding (MPW) joint, the adhesive layer in MPWB joint could absorb salt spray droplets and prevent them from penetrating the weld, thus delaying the deterioration of mechanical properties of the joint. By studying the corrosion path of salt spray droplets, it was found that most of the salt spray droplets in MPW joint penetrated into the hump of deformation zone, while some of the salt spray droplets in MPWB hybrid joint were absorbed by the adhesive layer. However, as the corrosion continues, the salt spray droplets gradually penetrated the adhesive layer, reducing the bonding force between adhesive and base material and the cohesion between adhesive layers. A small number of salt spray droplets flowed to outside of the weld, and gradually penetrated the weld and dissolved the metal around, resulting in local pitting connection. |
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