摘要
利用动电位扫描法,结合电化学交流阻抗技术研究了用传统电弧熔炼(CA)制备的铸态Cu-40Ni合金在不同Cl-含量的腐蚀介质中的电化学腐蚀行为.结果表明:铸态Cu-40Ni合金在含Cl-腐蚀介质中,随着Cl-含量的增加,自腐蚀电位不同程度负移,膜电阻减小,腐蚀速度加快;合金在Na2SO4中表现出了Warburg阻抗的性质,电极表面的腐蚀过程由电化学控制转变为扩散控制,而在加入Cl-后,没有出现Warburg阻抗的性质,腐蚀过程由电化学控制;腐蚀电化学阻抗谱呈单容抗弧特征,随Cl-含量的增加,极化电阻减小;腐蚀过程中存在一定弥散效应.
The corrosion behavior of CACu-40Ni alloy,prepared by conventional casting(CA) in solution with defferent Cl^- content,was studied by potentiodynamic polarization method with Electrochemical Impedance Spectroscopy(EIS).The results showed that with the increase of Cl^- content,corrosion electric potential moved toward negative direction in defferent degrees,the film resistance decreased and corrosion rate increased.The corrosion behavior of alloy showed quality of Warburg impedance in solution of N_2SO_4.The process of corrosion was controlled by electrochemistry initially then controlled by diffusion.After Cl^- included,the process of corrosion was controlled by electrochemistry only without Warburg impedance.The Nyquist plots for the corrosion of CACu-40Ni alloy were composed of single capacitance loops.With the increase of Cl^- content,resistance of polarization decreased.Disperse effect occurred in corrosion process also be observed.
出处
《沈阳师范大学学报（自然科学版）》
CAS
2004年第3期220-223,共4页
Journal of Shenyang Normal University:Natural Science Edition
基金
辽宁省教育厅基金资助项目(202112022).
