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应力作用下1420Al-Li合金的腐蚀行为研究
Corrosion behavior of 1420Al-Li alloy under tensile stress
【摘要】 通过动电位极化曲线、电化学阻抗谱,并结合SEM图,研究恒应力作用下1420Al-Li合金在3.5%NaCl溶液中的腐蚀行为.结果表明:随着应力增加,材料的腐蚀加剧;合金主要腐蚀类型为孔蚀,这是由于合金的主要时效强化相为δ′相(Al3Li),它作为阳极相均匀弥散分布在基体中,晶界处仅有少量的S(Al2MgLi)相.
【Abstract】 The corrosion behavior of 1420Al-Li alloy under applied tensile stress in neutral 3.5% NaCl solution was investigated by potentiodynamic polarization curves,electrochemical impedance spectroscopy(EIS)and SEM.It is found that the corrosion of 1420 alloy is greatly aggravated with growing stress.Pitting corrosion is dominating rather than intergranular corrosion,for that δ′(Al3Li)as anode is the main age strengthening phase evenly precipitated in the matrix,while few S(Al2MgLi) lay on the grain boundary.
【关键词】 1420Al-Li合金;
动电位极化;
电化学阻抗谱;
恒应力;
【Key words】 1420Al-Li alloy; potentiodynamic polarization; electrochemical impedance spectroscopy; constant tensile stress;
【Key words】 1420Al-Li alloy; potentiodynamic polarization; electrochemical impedance spectroscopy; constant tensile stress;
【基金】 国家自然科学基金项目(50401012)
- 【文献出处】 材料研究与应用 ,Materials Research and Application , 编辑部邮箱 ,2007年02期
- 【分类号】TG172.9
- 【被引频次】9
- 【下载频次】149