| Electrochemical corrosion behavior of Cu-40Ni-20Cr alloys with different grain sizes in solutions containing chloride ions |
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| 作者姓名： | 曹中秋 边静 薛荣 刘伟华 |
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| 作者单位： | Department of Chemistry, Shenyang Normal University, Shenyang 110034, China |
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| 基金项目： | 国家自然科学基金;辽宁省自然科学基金 |
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| 摘 要： | The electrochemical corrosion behavior of the two Cu-40Ni-20Cr alloys prepared by conventional casting（CA） and mechanical alloying（MA） with the different grain sizes was studied by using open-circuit potential（OCP）, potentiodynamic polarization and electrochemical impedance spectroscopy（EIS） methods in solutions containing chloride ions. The results show that the free corrosion potentials of the two alloys move towards negative values, corrosion currents increase and therefore corrosion rates become faster with the increase of chloride ion concentrations. EIS plots of CACu-40Ni-20Cr alloy are composed of single capacitive loop, while EIS plots of MACu-40Ni-20Cr alloy are composed of double capacitive loops in solution containing lower chloride ion concentrations. EIS plots of the two alloys have Warburg impedance with the increase of chloride ion concentrations. Corrosion rates of MACu-40Ni-20Cr alloy become faster than those of CACu-40Ni-20Cr alloy obviously in solutions containing the same chloride ion concentrations because MACu-40Ni-20Cr alloy is able to produce large concentrations of grain boundaries in the course of reduction in grain size by mechanical alloying.
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| 关 键 词： | Cu-Ni-Cr合金 晶体 电化学腐蚀 微观结构 |
| 收稿时间： | 15 July 2007 |
| 修稿时间： | 2007-07-15 |
Electrochemical corrosion behavior of Cu-40Ni-20Cr alloys with different grain sizes in solutions containing chloride ions |
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| Zhong-qiu CAO, Jing BIAN, Rong XUE,Wei-hua LIU.Electrochemical corrosion behavior of Cu-40Ni-20Cr alloys with different grain sizes in solutions containing chloride ions[J].Transactions of Nonferrous Metals Society of China,2007,17(6):1236-1241. |
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| Authors: | Zhong-qiu CAO Jing BIAN Rong XUE Wei-hua LIU |
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| Affiliation: | Department of Chemistry, Shenyang Normal University, Shenyang 110034, China |
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| Abstract: | The electrochemical corrosion behavior of the two Cu-40Ni-20Cr alloys prepared by conventional casting(CA) and mechanical alloying(MA) with the different grain sizes was studied by using open-circuit potential(OCP), potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) methods in solutions containing chloride ions. The results show that the free corrosion potentials of the two alloys move towards negative values, corrosion currents increase and therefore corrosion rates become faster with the increase of chloride ion concentrations. EIS plots of CACu-40Ni-20Cr alloy are composed of single capacitive loop, while EIS plots of MACu-40Ni-20Cr alloy are composed of double capacitive loops in solution containing lower chloride ion concentrations. EIS plots of the two alloys have Warburg impedance with the increase of chloride ion concentrations. Corrosion rates of MACu-40Ni-20Cr alloy become faster than those of CACu-40Ni-20Cr alloy obviously in solutions containing the same chloride ion concentrations because MACu-40Ni-20Cr alloy is able to produce large concentrations of grain boundaries in the course of reduction in grain size by mechanical alloying. |
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| Keywords: | Cu-Ni-Cr alloy grain size electrochemical corrosion microstructure |
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