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将6061-T6铝合金进行空冷、水冷的多道搭接搅拌摩擦加工(multi-pass FSP),用金相显微镜、扫描电镜、透射电镜、浸泡腐蚀试验和电化学腐蚀等手段表征了核区材料的腐蚀性能。结果表明:母材经这两种冷却方式的FSP改性后,核区的晶粒明显细化,腐蚀性能有显著的提高;与母材相比,核区的腐蚀电压较高,腐蚀电流密度较小,阻抗较大;空冷FSP的核区材料比水冷的腐蚀性能更好。
The 6061-T6 aluminum alloy was subjected to air-cooled and water-cooled multi-pass FSP. The metallographic data of the core region were characterized by means of metallographic microscope, scanning electron microscope, transmission electron microscope, immersion corrosion test and electrochemical corrosion. Corrosion properties. The results show that after the base metal is modified by FSP, the grain size of the core zone is obviously refined and the corrosion performance is obviously improved. Compared with the base metal, the corrosion voltage in the core zone is higher and the corrosion current density Smaller, larger impedance; air-cooled FSP core material better than water-cooled corrosion.