中文摘要：

合金由常规扔准备了的二 Cu-40Ni-20Cr (CA ) 和有不同谷物尺寸的机械 alloying (麻省) 的电气化学的腐蚀行为被使用开电路的潜力(OCP ) 学习， potentiodynamic 极化和电气化学的阻抗光谱学(EIS ) 在包含氯化物离子的溶液的方法。结果证明二合金的免费腐蚀潜力向否定价值移动，腐蚀水流增加，因此，腐蚀率随氯化物离子集中的增加变得更快。CACu-40Ni-20Cr 合金的 EIS 阴谋由单个电容的循环组成，当 MACu-40Ni-20Cr 合金的 EIS 阴谋在包含更低的氯化物离子集中的答案由两倍电容的环组成时。二合金的 EIS 阴谋随氯化物离子集中的增加有 Warburg 阻抗。MACu-40Ni-20Cr 合金的腐蚀率在因为 MACu-40Ni-20Cr 合金能由机械 alloying 在谷物尺寸在减小期间生产谷物边界的大集中，包含一样的氯化物离子集中的溶液显然 CACu-40Ni-20Cr 合金变得比那些快。

英文摘要：

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.