Scanning electrochemical microscopy (SECM) and scanning vibrating electrode technique (SVET) were used to investigate the electrochemical behaviour of the top surface of the 2098-T351 alloy welded by friction stir welding (FSW). The SVET technique was efficient in identifying the cathodic and anodic weld regions. The welding joint (WJ), which comprises the thermomechanically affected zone (TMAZ) and the stir zone (SZ), was cathodic relative to the heated affected zone (HAZ) and the base metal (BM). The reactivities of the welding joint at the advancing side (AS) and the retreating side (RS) were analyzed and compared using SECM technique in the competition mode by monitoring the dissolved oxygen as a redox mediator in 0.005 mol L⁻¹ NaCl solution. The RS was more electrochemically active than the AS, and these results were correlated with the microstructural features of the welded alloy.

采用扫描电化学显微镜（SECM）和扫描振动电极技术（SVET）研究了搅拌摩擦焊（FSW）焊接的2098-T351合金顶表面的电化学行为。SVET技术可以有效地识别阴极和阳极焊接区域。包括热机械影响区（TMAZ）和搅拌区（SZ）的焊接接头（WJ）相对于受热影响区（HAZ）和贱金属（BM）为阴极。使用SECM技术在竞争模式下通过监测溶解氧作为0.005 mol L ^-1的氧化还原介体，分析和比较了前进侧（AS）和后退侧（RS）焊接接头的反应性。氯化钠溶液。RS比AS具有更强的电化学活性，这些结果与焊接合金的微观结构特征相关。