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利用动电位极化曲线,交流阻抗谱(EIS)和扫描电子显微镜(SEM)测试方法,在室温0.2 mol/L NaHSO_3和0.6 mol/L NaCl的水溶液中,对比研究了铝合金搅拌摩擦焊(FSW)焊缝和熔化极惰性气体保护焊(MIG)焊缝电化学性能。结果表明:FSW焊缝的腐蚀速率低于MIG焊缝和母材的腐蚀速率;FSW焊缝的腐蚀电位高于MIG焊缝和母材的腐蚀电位;FSW焊缝的腐蚀电流密度低于MIG焊缝和母材的腐蚀电流密度;FSW焊缝的极化电阻高于MIG焊缝和母材的极化电阻。所有样品的EIS Nyquist谱图上均有一感抗弧存在;SEM观察表明:仅有少量浅蚀坑出现在FSW焊缝表面。
The friction stir welding of aluminum alloy (FSW) was studied by potentiodynamic polarization curves, EIS and SEM. Electrochemical properties of welds and MIG welds. The results show that the corrosion rate of FSW weld is lower than the corrosion rate of MIG weld and base metal. The corrosion potential of FSW weld is higher than the corrosion potential of MIG weld and base metal. The corrosion current density of FSW weld is lower than that of MIG welding Corrosion current density of seam and base metal; Polarization resistance of FSW weld is higher than polarization resistance of MIG weld and base metal. An EIS Nyquist spectrum of all samples showed an inductive arc. SEM observations showed that only a few shallow pits appeared on the FSW weld surface.