不同参数下对1．6mm厚7075铝合金板进行了搅拌摩擦焊接，在分析了焊缝表面组织的基础上，采用浸泡试验对焊缝表面的腐蚀行为进行研究，讨论了硬度分布与腐蚀发生的关系。结果表明，焊后轴肩作用区晶粒细化明显。随转速的增加，焊缝上表面热机械影响区范围加宽、轴肩作用区硬度增大。焊缝上表面腐蚀最严重的区域为轴肩作用区，在EXCO溶液中浸泡4h后发生明显的剥落腐蚀，剥蚀以轴肩作用区为中心向两边扩展。接头硬度的软化区是腐蚀发生较严重的区域。
Friction stir welding （FSW） for 1.6 mm thickness 7075 aluminum alloy sheets with different processing parameters was carried out. Based on the analysis of the microstructures of the joint surface, the corrosion behavior was investigated by immersion test. The correlation between the micro-hardness distribution and the corrosion was discussed. The results showed that the grains in the shoulder active zone （SAZ） were obviously refined with the increase of the rotational speed. The spans of the thermomechanically-affected zone （TMAZ） widened and the hardness in the SAZ increased with the increase of the rotation speed. The SAZ corroded worse than other regions. Exfoliation corrosion attack occurred predominantly in the SAZ after being immersed for 4 hours in EXCO solution, and the exfoliation corrosion extended from the SAZ to heat-affected zone. The hardness softened zone was the corrosion sensitive region.
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