摘要
通过电化学工作站和零电阻电流计测量了10、20、40、60℃下Ni47Ti44Nb9的极化曲线、交流阻抗谱图及Ni47Ti44Nb9-3A21偶对的电偶电流。通过金相显微镜与扫描电镜(SEM)的方法观察表面腐蚀形貌;采用EDS的方法分析了Ni47Ti44Nb9的腐蚀产物。结果表明:随着温度的升高,Ni47Ti44Nb9的自腐蚀电位负移,60℃时为-0.734 V,此时腐蚀电流密度为4.79μA·cm^(-2),Ni47Ti44Nb9记忆合金整体耐蚀性能良好,表面生成氧化膜为TiO_(2)。3A21铝锰合金与Ni47Ti44Nb9记忆合金电位差值最大为1.03 V,偶对中Ni47Ti44Nb9作为阴极受到保护,3A21为阳极腐蚀加剧,不同温度下最高电偶电流密度为12.6μA·cm^(-2),电偶腐蚀敏感等级为C级良好。
The polarization curves, electrochemical impedance spectra and galvanic current of Ni47Ti44Nb9 pair at 10,20, 40 and 60 ℃ were measured by electrochemical workstation and zero-resistance galvanometer. The surface corrosion morphology was observed by metallographic microscope and scanning electron microscope(SEM), and the corrosion products of Ni47Ti44Nb9 were analyzed by EDS. The results show that the self-corrosion potential of Ni47Ti44Nb9 becomes more negative with the increase of temperature, which is-0.734 V at 60 ℃. At this point, the corrosion current density is 4.79 μA·cm^(-2), and the overall corrosion resistance of Ni47Ti44Nb9 memory alloy is good, and the oxide film appearing on the surface is TiO_(2). The maximum potential difference between 3A21 alloy and Ni47Ti44Nb9 memory alloy is 1.03V. In the pair,Ni47Ti44Nb9 is protected as a cathode, while 3A21 is intensified by anodic corrosion. The maximum coupling current density at different temperatures is 12.6 μA·cm^(-2), and the coupling corrosion sensitivity grade is C, indicating good.
作者
崔艳雨
迪丽努尔·迪力木拉提
丁清苗
CUI Yanyu;Dilinuer·DILIMULATI;DING Qingmiao(Airport College,Civil Aviation University of China,Tianjin 300300,China)
出处
《热加工工艺》
北大核心
2022年第14期32-37,共6页
Hot Working Technology
基金
民航安全能力建设基金项目(19CX05007A)。
