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采用原位腐蚀试验、静态失重试验、浸泡试验研究了2219铝合金搅拌摩擦焊接接头的剥落腐蚀行为与机理。结果表明:2219铝合金搅拌摩擦焊焊缝腐蚀速率比母材小,焊缝的抗腐蚀性提高;腐蚀从局部点蚀开始,起源于第二相粒子与其边缘的铝基体,第二相粒子作阴极;原位腐蚀2 h后焊核与热机影响区发生晶间腐蚀,母材发生严重的点蚀;均匀分布的第二相粒子与细小的等轴晶组织是焊核区剥落腐蚀敏感性降低的主要原因。
In situ corrosion test, static weight loss test and immersion test were used to study the flaking corrosion behavior and mechanism of 2219 aluminum alloy friction stir welded joint. The results show that the corrosion rate of friction stir welding of 2219 aluminum alloy is smaller than that of the base metal and the corrosion resistance of the weld is improved. The corrosion originates from the local pitting corrosion and originates from the aluminum matrix of the second phase particles and its edge. The second phase particles Cathode. The intergranular corrosion occurred in the weld zone and the heat affected zone after in situ corrosion for 2 h, and the pitting corrosion occurred on the base material. The uniform distribution of the second phase particles and the fine equiaxed grain structure resulted in the decrease of corrosion susceptibility The main reason.