摘要
通过不同应力(0%σ0.2,30%σ0.2,60%σ0.2,90%σ0.2和103%σ0.2)加载条件下的短时间浸泡实验和原位电化学测试,研究了应力加载对2297铝锂合金在3.5%(质量分数)NaCl溶液中点蚀行为的影响。结合2297铝锂合金初始及塑性变形后的微观结构表征,探讨了应力加载对其腐蚀行为影响的机制。结果表明,塑性变形后,2297铝锂合金中原始存在的粗大AlCuMnFe金属间化合物颗粒变得细小而分散,晶粒内部产生了位错堆积而形成的位错墙。点蚀主要发生在AlCuMnFe金属间化合物颗粒的周围,晶面滑移、位错缠结等晶体缺陷也会成为腐蚀形核位置。应力载荷的增加(由0%σ0.2~103%σ0.2)导致腐蚀电位负移,腐蚀电流密度增加,电荷转移电阻减小,应力水平达到塑性应力范围时变化更加明显。
The effect of tensile load on pitting corrosion behavior of 2297 Al-Li alloy in 3.5%(mass fraction)NaCl solution was studied by short time immersion test and in-situ electrochemical test under different loading conditions within the range of 0%,30%,60%,90%and 103%of theσ0.2 of the alloy,while the microstructure of the initial and plastically deformed 2297 Al-Li alloy was characterized.After plastic deformation,AlCuMnFe intermetallic particles of 2297 Al-Li alloy become fine and uniformly dispersed,and dislocation walls are formed inside the grains due to dislocation accumulation.Pitting corrosion mainly occurs around the AlCuMnFe intermetallic particles,and crystal defects such as crystal plane slip and dislocation entanglement also become corrosion nucleation sites.The increase of the applied load within the range of 0%σ0.2~103%σ0.2 leads to negative shift of the corrosion potential,increase of the corrosion current density and the charge transfer resistance,which will become more obvious when the stress level reaches the plastic stress range.
作者
于美
魏新帝
范世洋
刘建华
李松梅
钟锦岩
YU Mei;WEI Xindi;FAN Shiyang;LIU Jianhua;LI Songmei;ZHONG Jinyan(School of Materials Science and Engineering,Beihang University,Beijing 100083,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2019年第5期439-445,共7页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51671013)~~
关键词
铝锂合金
腐蚀
应力
微观结构
电化学
Al-Li alloy
corrosion
stress load
microstructure
electrochemistry
