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首页> 外文期刊>Journal of Materials Engineering and Performance >Evaluating the Electrochemical Behavior of Friction Stir-Welded AA2219-O Alloy Joint in 3.5% NaCl Solution
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Evaluating the Electrochemical Behavior of Friction Stir-Welded AA2219-O Alloy Joint in 3.5% NaCl Solution

机译：评价3.5％NaCl溶液中摩擦搅拌焊接AA2219-O合金接头的电化学行为

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摘要

Single-pass friction stir welding of AA2219-O aluminum alloy was carried out at high rotation speed (1180 rpm), and transverse travel rate of 33.5 mm/min was selected. The microstructural, mechanical and electrochemical characteristics of the weldment are investigated in this study. The high rotational tool speed resulted in a less uniform distribution of the intermetallic theta-phase (CuAl2) in the thermo-mechanically affected zone (TMAZ) than in the weld nugget zone (WNZ). The higher transfer coefficient and lower charge transfer resistance (R (ct) + R (theta)) were observed in case of TMAZ as evaluated from potentiodynamic polarization and impedance spectroscopy, respectively. These results confirmed that microstructural variations could deteriorate the electrochemical performance of the weldment. TMAZ provided the least corrosion resistance than the base metal (BM) and WNZ due to the high concentration of cathodic intermetallic particles and possibly due to the large mechanical distortion of the grain structure.
机译：在高转速（1180 rpm）下对AA2219-O铝合金进行了单道搅拌摩擦焊，选择了33.5 mm/min的横向移动速率。研究了焊接件的微观结构、力学和电化学特性。高旋转刀具速度导致金属间化合物θ相（CuAl2）在热机械影响区（TMAZ）中的分布不如在熔核区（WNZ）中均匀。根据动电位极化和阻抗谱，在TMAZ情况下，观察到较高的转移系数和较低的电荷转移电阻（R（ct）+R（θ））。这些结果证实，微观结构的变化可能会恶化焊接件的电化学性能。TMAZ的耐腐蚀性比母材（BM）和WNZ最低，这是因为阴极金属间化合物颗粒浓度高，可能是因为晶粒结构的机械变形大。

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