Dissimilar friction stir welding of AA5083-AA6061 alloys in different cooling environments (air, liquid nitrogen, and water) was successfully employed as an alternative method to enhance corrosion resistance and mechanical properties. The evolution of microstructure, corrosion behavior, and mechanical properties of friction stir welded joints were studied using optical microscopy (OM), electron backscattered diffraction, scanning electron microscope, electrochemical workstation, and universal testing machine. The results indicated that the width of the stir zone and grain size of heat-affected zones were reduced by the use of external cooling media. Electron backscattered diffraction results showed that the grain size in air-cooled friction stir welding, nitrogen-cooled friction stir welding and water-cooled friction stir welding were 7.6 µm, 4.5 µm, and 3.2 µm, respectively, and water-cooled friction stir welding joint developed a larger fraction of high-angle grain boundaries at stir zone. The intermetallics formed in the joints using cooling media were finer compared to that of the air-cooled samples. The corrosion behavior of the stir zone was impacted by the cooling environment while potentiodynamic polarization results revealed that the water-cooled friction stir welding joint showed excellent corrosion resistance due to the finer size of intermetallics. The minimum hardness values shifted to the stir zone in the case of nitrogen-cooled friction stir welding and water-cooled friction stir welding from the heat-affected zone location as in the air-cooled friction stir welding joint. For the joint made with water-cooled friction stir welding, maximum yield strength was obtained with a joint efficiency of 96% relative to AA5083 base material.

AA5083-AA6061 合金在不同冷却环境（空气、液氮和水）中的异种搅拌摩擦焊被成功用作提高耐腐蚀性和机械性能的替代方法。利用光学显微镜（OM）、电子背散射衍射、扫描电子显微镜、电化学工作站和万能试验机研究了搅拌摩擦焊接头的微观结构、腐蚀行为和力学性能的演变。结果表明，使用外部冷却介质减小了搅拌区的宽度和热影响区的晶粒尺寸。电子背散射衍射结果表明，风冷搅拌摩擦焊、氮冷搅拌摩擦焊和水冷搅拌摩擦焊的晶粒尺寸为7.6 µm，4。5 µm 和 3.2 µm 和水冷搅拌摩擦焊接接头在搅拌区形成了更大比例的大角度晶界。与风冷样品相比，使用冷却介质在接头中形成的金属间化合物更细。搅拌区的腐蚀行为受到冷却环境的影响，而动电位极化结果表明，由于金属间化合物的尺寸较小，水冷搅拌摩擦焊接接头表现出优异的耐腐蚀性。在氮冷搅拌摩擦焊和水冷搅拌摩擦焊的情况下，最小硬度值从热影响区位置移动到搅拌区，如风冷搅拌摩擦焊接头。对于水冷搅拌摩擦焊制成的接头，