Corrosion performance and mechanical properties of friction stir welded AA2024-T3 joints under different corrosion solution exposure
Corrosion performance and mechanical properties of friction stir welded AA2024-T3 joints under different corrosion solution exposure
复制标题
不同腐蚀溶液暴露下搅拌摩擦焊AA2024-T3接头的腐蚀性能及力学性能
DOI：
10.1002/maco.201609346
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发表时间：
2017-09-01
影响因子：
1.8
通讯作者：
Alexopoulos, N. D.
中科院分区：
文献类型：
--
作者：
Li, N.;Li, W. Y.;Alexopoulos, N. D.
对2024-T3铝合金薄板进行搅拌摩擦焊，分析了热机械影响区和搅拌区的微观组织。腐蚀暴露对接头的影响进行了评估，根据不同的解决方案（3.5wt%NaCl，3.5wt%NaCl +1wt%HCl，和剥落腐蚀EXCO）的浸泡试验以及电化学测量;试样与预腐蚀接头进行拉伸试验。结果表明，FSW焊接接头的TMAZ和SZ在三种腐蚀溶液中表现出不同的腐蚀性能。SZ比TMAZ具有更高的耐腐蚀性，因为SZ中沉淀物的溶解大大降低了其对腐蚀的敏感性。暴露于EXCO溶液中的接头比其他两种溶液具有更高的机械性能退化，而SZ和TMAZ的耐腐蚀性与S型沉淀物的存在以及H+和Cl-离子的浓度相关。
Aluminum alloy 2024-T3 sheets were friction stir welded (FSWed) and the microstructure in the thermo-mechanically affected zone (TMAZ) and stir zone (SZ) were characterized. The effect of corrosion exposure on the joints was evaluated under different solutions (3.5wt% NaCl, 3.5wt% NaCl+1wt% HCl, and exfoliation corrosion-EXCO) by immersion tests as well as electrochemical measurements; specimens with pre-corroded joints were subjected to tensile testing. The results indicate that TMAZ and SZ of the FSWed joints present different corrosion performances for the three corrosion solutions. SZ shows higher corrosion resistance than TMAZ, as the dissolution of precipitates in SZ considerably decreases its susceptibility to corrosion. The joint exposed to the EXCO solution has suffered higher mechanical properties degradation than the other two solutions, while the corrosion resistance of SZ and TMAZ was associated with the presence of the S-type precipitates and the concentration of H+ and Cl- ions.