2524同质铝合金回填式搅拌摩擦点焊耐蚀性研究  

Corrosion Resistance of 2524 Similar Aluminum Alloy Welded by Refilling Friction Stir Spot Welding

作　　者：姜楠 李京龙[1] 熊江涛[1] 石俊秒 豆建新 柴鹏 JIANG Nan;LI Jing-long;XIONG Jiang-tao;SHI Jun-miao;DOU Jian-xin;CHAI Peng(Shaanxi Key Laboratory of Friction Welding Technologies,State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China;AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]西北工业大学材料学院凝固技术国家重点实验室陕西省摩擦焊接技术重点实验室,西安710072 [2]中国航空制造技术研究院,北京1000024

出　　处：《精密成形工程》2019年第6期53-58,共6页Journal of Netshape Forming Engineering

摘　　要：目的研究2524铝合金回填式搅拌摩擦点焊接头不同焊接区域的耐腐蚀性能。方法采用晶间腐蚀实验结合电子扫描显微镜(SEM)及能谱仪(EDS)技术,分析了焊缝处不同区域的微观形貌、腐蚀形貌及腐蚀深度,并对腐蚀机理进行了讨论。结果搅拌区内的晶粒最为细小,热影响区的晶粒尺寸最大。搅拌区主要为点蚀,最大腐蚀坑深度为2.45μm;热影响区则发生剥落腐蚀,最大腐蚀深度为45.65μm。结论热影响区的耐蚀性最差,腐蚀程度最为严重。The paper aims to study the corrosion resistance of 2524 aluminum alloy refilling friction stir spot welding joints in different welding regions. Combined with scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS) techniques, the microstructure, corrosion morphology and corrosion depth of different weld regions of the joint were analyzed, and the corrosion mechanism was discussed. The results showed that the grain size in the stirring zone(SZ) was the smallest, while that in the heat-affected zone(HAZ) was the largest. In the SZ, the corrosion was pits, and the maximum depth of the pit was 2.45 μm. Severe exfoliation corrosion occurred in the HAZ. The maximum corrosion depth was 45.65 μm. The HAZ exhibits the worst corrosion resistance and the most severe corrosion.

关 键 词：2524铝合金 回填式搅拌摩擦点焊 腐蚀 

分 类 号：TG456.9[金属学及工艺—焊接]