为了研究Al／Cu异种材料搅拌摩擦焊焊缝的耐腐蚀性能，对4mm的5A06和T2搅拌摩擦焊焊接接头进行了浸泡腐蚀试验。结果表明，焊缝区的耐腐蚀性能比铝合金母材要差，而焊缝铝铜结合过渡区耐腐蚀性能最差，并在该区域产生了腐蚀沟。电子能谱和X射线衍射物相分析结果发现，在过渡区Mg含量比其它区域高，而且有少量Al4Cu9产生，它的自腐蚀电位比铝高，这是导致该区域严重腐蚀的主要原因。
In order to study the corrosion resistance of Al/Cu dissimilar metals joined by friction stir welding, immersion corrosion tests of 5A06-T2 dissimilar weld metal plate of 4 mm in thickness prepared by friction stir welding were carried out. The results indicated that the corrosion resistance of weld zone was worse than that of the parent aluminum alloy, the region of the most serious corrosion was the transition zone of 5A06 and T2 combination, in which groovy corrosion appeared Electron spectroscopy and XRD phase analysis research showed that the content of Mg was higher in transition zone. The second phase Al4Cu9 appeared in this region, and AhCu9 had higher corrosion potential compared with Al metal. Those were the main reasons of serious corrosions of this region.
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