| Cl-含量对铸态Cu-40Ni合金电化学腐蚀行为的影响 |
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| 引用本文： | 刘伟华,曹中秋,郑志国.Cl-含量对铸态Cu-40Ni合金电化学腐蚀行为的影响[J].沈阳师范大学学报(自然科学版),2004,22(3):220-223. |
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| 作者姓名： | 刘伟华 曹中秋 郑志国 |
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| 作者单位： | 沈阳师范大学,化学与生命科学学院,辽宁,沈阳,110034 |
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| 基金项目： | 辽宁省教育厅基金资助项目(202112022). |
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| 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.
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| 关 键 词： | Cu-Ni合金 极化曲线 交流阻抗 腐蚀 |
| 文章编号： | 1008-374X(2004)03-0220-04 |
| 修稿时间： | 2003年12月25 |
The effect of Cl- content on corrosion electrochemical behavior of CACu-40Ni Alloy |
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| LIU Wei-hua,CAO Zhong-qiu,ZHENG Zhi-guo.The effect of Cl- content on corrosion electrochemical behavior of CACu-40Ni Alloy[J].Journal of Shenyang Normal University: Nat Sci Ed,2004,22(3):220-223. |
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| Authors: | LIU Wei-hua CAO Zhong-qiu ZHENG Zhi-guo |
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| Abstract: | 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. |
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| Keywords: | Cu-Ni alloy polarization curve EIS corrosion |
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