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为了突出特定显微组织组成对AA2099铝锂合金严重局部腐蚀的影响,对比研究了固溶、预冷变形及人工时效状态下AA2099合金的腐蚀行为。通过浸泡和动电位极化在合金表面引入局部腐蚀;采用扫描电子显微镜和透射电子显微镜表征合金的显微组织和腐蚀形貌。研究表明:该合金的严重局部腐蚀敏感性与其热机械加工过程密切相关,且合金元素的存在方式影响腐蚀的扩展机理。T8状态合金的严重局部腐蚀敏感性比其他状态合金更高;当进行动电位极化时,固溶和T3状态合金表现为晶体学腐蚀特征而T6和T8状态合金表现为局部区域晶粒和晶界的择优腐蚀。
In order to highlight the serious localized corrosion of AA2099 Al-Li alloy with specific microstructure, the corrosion behavior of AA2099 alloy in solid solution, pre-cooling deformation and artificial aging was compared. Local corrosion was introduced into the alloy surface by immersion and potentiodynamic polarization. The microstructure and corrosion morphology of the alloy were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the severe localized corrosion sensitivity of the alloy is closely related to the thermomechanical process, and the existence of alloying elements influences the mechanism of corrosion expansion. T8 alloy is more sensitive to localized corrosion than other alloys. When the potentiodynamic polarization is applied, the solution alloy and T3 alloy show the characteristics of crystallographic corrosion, whereas the alloys of T6 and T8 show the local grain and crystal Preferential corrosion industry.