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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。
The microstructure and chemical composition of the 5383 aluminum alloy friction stir welded joint were analyzed by SEM and EDS methods. The mechanism of corrosion resistance reduction of the joint was discussed. The results show that the S-line appearing in the friction stir welded aluminum alloy joint greatly reduces the corrosion resistance of the joint. The most corrosive area is the S-line, while the corrosion resistance of the weld-core area except the S-line and its vicinity Better than base metal. Mg element segregation, a large number of micro-pore aggregation and ferromanganese compound segregation is the main cause of S-line corrosion the most serious. At the same time, the method of welding process to eliminate S wire in 5383 aluminum alloy friction stir welded joint is discussed, which greatly improves the corrosion resistance of the joint, which has important theoretical significance and practical significance for promoting the application of 5383 aluminum alloy in aviation, navigation and other fields Engineering significance.