腐蚀
材料科学
晶间腐蚀
冶金
原电池
合金
焊接
电偶腐蚀
搅拌摩擦焊
阴极保护
降水
铜
电化学
物理化学
气象学
物理
化学
电极
作者
Yuming Xie,Xianghai Meng,Feifan Wang,Yimeng Jiang,Xinyan Ma,Long Wan,Yongxian Huang
标识
DOI:10.1016/j.corsci.2021.109800
摘要
Corrosion behavior of friction stir welded Al-Cu alloy and Al-Cu-Li alloy joints were revealed via immersion, intergranular, exfoliation and electrochemical corrosion. Precipitation-driven corrosion was discussed based on experiments and theoretical modeling. The corrosion potential of the entire joint was nobler than base materials, which was mainly attributed to solid solution and precipitation evolution of high equilibrium potential elements. The macro/micro galvanic effect induced by the redistribution of copper was studied with a numerical model to explain the relationship between precipitation evolution and corrosion resistance. Reducing heat input by increasing welding speed was an effective strategy to improve corrosion resistance.
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