铝锂合金焊缝大气腐蚀行为研究

目的研究铝锂合金搅拌摩擦焊焊缝在大气环境中的腐蚀行为。方法采用电化学极化法、质量增加法、扫描电子显微镜、三维体式显微镜几种不同的表征手段对铝锂合金搅拌摩擦焊焊缝在模拟海洋大气环境中的腐蚀行为进行研究。结果焊缝部位存在较为严重的应力腐蚀开裂现象,腐蚀电位比基体部位负移约0.05 V,腐蚀速率比一般基体部位明显增大。结论搅拌摩擦焊虽具有较多优点,在其他领域得到一定应用,但针对铝锂合金在海军飞机方向的应用存在缺陷,不能直接裸露使用。

Study on Corrosion Behavior of Lithium Welded Aluminum Alloy in Atmospheric

Objective Research on lithium aluminium alloy friction stir weld in the corrosion behavior of atmospheric environment. Methods The electrochemical polarization method, weight loss method, , Scanning Electron Microscopy and microscope were conducted applied to researchto corrosion behaviors of fricitionfriction stir welding joint of aluminum lithium alloylithium welded aluminum alloy after friction stir welding in simulated marine atmosphere with the help of self-design equipment. Results Results showed that Serious stress corrosion cracking phenomenon was observed in the weld jointseam, which lead corrosion potential negative shifted about 0.05 V relative to other partsthe base. Meanwhile, the corrosion rate increased significantly. Conclusion Although friction stir welding haves been applied in many other fields already for some advantages, there are were obvious defects in the application of the Navy aircraft. It cannot be used directly in an exposed way. when it was exposed to use.