不同时效状态新型Al-Cu-Li系合金腐蚀的电化学阻抗谱
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF TWO DIFFERENT AGED STATUS OF A NEW TYPE Al-Cu-Li ALLOY TREATED BY DIFFERENT AGING PROCESSES
摘 要
通过对新型Al-Cu-Li系合金腐蚀的不同时间的电化学阻抗谱(EIS)分析,研究了该合金在T6、T8两种状态的腐蚀行为.宏观腐蚀行为和电化学阻抗谱表明,T8态由于时效前的预变形有效地降低了合金的腐蚀敏感性.从未经腐蚀的材料的微观形貌分析了该合金晶界、亚晶界和相关的第二相的分布和形貌进一步解释了两种状态合金腐蚀行为的差异性.T8态存在大量界面,使倾向于在晶界亚晶界形核的T1相在基体中分布较T6态细小,在剥落腐蚀中由腐蚀产物形成的楔形力较小,因此,T8态表现出比T6态更好的抗腐蚀能力.
Al-Cu-Li合金
腐蚀
微观组织
EIS
Al-Cu-Li alloy
Corrosion
Microstructure
Abstract
Electrochemical impedance spectroscopy (EIS) and the corrosion behavior of a new type Al-Cu-Li alloy in T6 aged and T8 aged status during corrosion process were studied.The corrosion resistance of T8-treated samples was better than that of T6-treated ones because of the deformation before aging.The difference of the two type samples in corrosion behavior was analyzed by microstructure observation,including grain boundary and sub-boundary,precipitates in matrix of samples before corrosion.Due to the deformation,precipitate T1 phase in T8-treated samples was smaller than that in T6-treated ones,which leaded to smaller stress caused by corrosion products in T8-treated samples.Thus,corrosion resistance of T8-treated samples was better than that of T6-treated ones.
中图分类号 TG172 TG166
所属栏目 试验研究
基金项目 新金属材料国家重点实验室资助
收稿日期 2006/12/6
修改稿日期 2007/1/30
网络出版日期
作者单位点击查看
引用该论文: LI Hong-ying,ZENG Zai-de. ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF TWO DIFFERENT AGED STATUS OF A NEW TYPE Al-Cu-Li ALLOY TREATED BY DIFFERENT AGING PROCESSES[J]. Corrosion & Protection, 2007, 28(11): 549～552
被引情况:
【1】张海锋,陈琴, "时效制度对含钪超高强铝合金晶间腐蚀和剥落腐蚀的影响",腐蚀与防护 33, 127-131(2012)
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参考文献
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