在详细分析2024铝合金搅拌摩擦焊焊缝表面微结构的基础上,采用酸性连续盐雾试验研究焊缝表面的腐蚀行为.组织分析表明,焊缝表层因受搅拌头轴肩水平挤压作用而呈现弧形条纹特征,并导致晶粒和第二相粒子得到显著细化;合金中的第二相粒子主要为棒状的Al2CuMg(S相)和颗粒状的CuAl2(θ相).盐雾试验表明,搅拌摩擦焊焊缝区耐蚀性因包铝层遭到破坏而呈现下降趋势,腐蚀程度因焊缝表面残留的纯铝而呈现不均匀性.腐蚀首先从局部点蚀开始,最终演变为剥落腐蚀.
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