AA2219-T87铝合金双轴肩搅拌摩擦焊的腐蚀行为

Corrosion Behavior of Self-Reacting Friction Stir Welded AA2219-T87 Aluminum Alloy

摘要:

采用电化学腐蚀和浸泡腐蚀试验对双轴肩搅拌摩擦焊AA2219-T87型铝合金的不同区域进行了腐蚀研究。结果表明，焊缝区具有最高的耐腐蚀性，母材的耐腐蚀性最差。母材中析出相的体积分数最高，越靠近焊核，析出相回溶数量越多。焊核区由细小的等轴晶组成，只存在少量θ相

Abstract:

The corrosion behavior of different regions of AA2219-T87 aluminum alloys after self-reacting friction stir welding was investigated through the electrochemical corrosion and immersion corrosion tests. The results show that the weld nugget zone (WNZ) has the optimal corrosion resistance, while the base material shows the worst corrosion resistance. In the base material, the volume fraction of precipitated phase is the largest. The closer the area to the nugget center, the more the dissolving precipitated phase. WNZ is composed of fine equiaxed grains with a small amount of θ phase.