5383铝合金搅拌摩擦焊接头耐腐蚀性降低的原因与改善方法研究
Analysis and Improvement on Decrease of Corrosion Resistance of Joint of 5383 Al Alloy by FSW
姬书得, 张利国, 刘震磊, 高双胜
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作者单位：(沈阳航空航天大学 航空宇航学院， 辽宁 沈阳 110034)
中文关键字：5383铝合金； 搅拌摩擦焊； S线； 耐腐蚀性
英文关键字：5383 Al alloy; friction stir welding(FSW); S line; corrosion resistance
中文摘要：通过SEM与EDS方法对5383铝合金搅拌摩擦焊接头进行了微观形貌观察与化学成分分析，对接头耐腐蚀性降低的机理进行了探讨。结果表明：铝合金搅拌摩擦焊接头中出现的S线会大大降低接头的耐腐蚀性；腐蚀最严重的区域是S线，而除S线及其附近区域之外的焊核区的耐腐蚀性优于母材。Mg元素偏聚、大量微孔的聚集与锰铁化合物的偏聚是导致S线腐蚀最严重的主要原因。同时，讨论了消除5383铝合金搅拌摩擦焊接头中S线的焊接工艺方法，使接头的耐腐蚀性大大提高，这对于促进5383铝合金在航空、航海等领域的应用具有重要的理论意义与实际工程意义。
英文摘要：The morphology and chemical composition of joint of 5383 Al alloy by FSW were analyzed by SEM and EDS. And then the mechanism of the decrease of corrosion resistance was discussed. The results show that the decrease of corrosion resistance results from S line which appears in the welded joint of 5383 Al alloy. The region of the most serious corrosion is S line, while the corrosion resistance of other regions in weld is better than the parent metal. The segregation of Mg and MnFe compound, and the aggregation many micropores are the reasons why S line is the most serious region of corrosion. Moreover, the welding technology was discussed to make S line in friction stir welded joint of 5383 Al alloy disappear in order to improve the corrosion resistance of friction stir welded joint. The research owns important theory meaning and practical engineering meaning for enhancing the application of 5383 Al alloy in the field of aviation, navigation and so on.