工程机械用Cu-Ni合金的腐蚀行为研究  

Study on Corrosion Behavior of Cu-Ni Alloy for Construction Machinery

作　　者：管卫华[1] 林用满[1,2] 谢再晋 GUAN Weihua;LIN Yongman;XIE Zaijin(Guangdong AIB Polytechnic College,Guangzhou 510507,China;College of Engineering,Peking University,Beijing 100871,China;Department of Materials Engineering,South China University of Technology,Guangzhou 510000,China)

机构地区：[1]广东农工商职业技术学院,广东广州510507 [2]北京大学工学院,北京100871 [3]华南理工大学材料工程系,广东广州510000

出　　处：《热加工工艺》2021年第4期71-75,79,共6页Hot Working Technology

摘　　要：对Cu-Ni合金进行了全浸腐蚀、电化学腐蚀和冲刷腐蚀性能测试。研究了全浸时间、冲刷流速对Cu-Ni合金腐蚀速率、腐蚀类型和电化学性能的影响,并分析了腐蚀反应的作用机理。结果表明,全浸腐蚀过程中Cu-Ni合金表面会形成Cu_(2)O氧化膜,而全浸腐蚀时间达到720h后表面膜中的Cu_(2)O会与腐蚀介质中的氧气和氯离子发生反应形成Cu(OH)_(3)Cl;Cu-Ni合金表面氧化膜的形成可有效抑制腐蚀介质与基体的接触,从而对合金基体起到保护作用。随着全浸腐蚀时间的延长,腐蚀深度速率的变化趋势与全浸腐蚀速率的变化趋势保持一致,即采用线性极化方法测试Cu-Ni合金在静态3.5%NaCl溶液中的腐蚀速率是可行的;在冲刷流速低于临界流速下的Cu-Ni合金具有较低的腐蚀速率,可起到对材料良好的保护作用。The fully immersion corrosion,electrochemical corrosion and erosion corrosion tests of Cu-Ni alloy were carried out.The effects of total immersion time and flow rate on the corrosion rate,corrosion type and electrochemical performance of Cu-Ni alloy were studied,and the effect mechanism of corrosion reaction was analyzed.The results show that Cu_(2)O oxide film appears on the surface of Cu-Ni alloy during the process of full immersion corrosion,and the Cu_(2)O in the surface film reacts with the oxygen and chloride ions in the corrosion medium to form Cu(OH)_(3)Cl after the corrosion time up to 720 h.The formation of oxide film on the surface of Cu-Ni alloy can effectively restrain the contact between the corrosive medium and the substrate,and then the alloy matrix is protected.With increasing the full immersion corrosion time,the change trend of the corrosion depth rate and fully immersion corrosion rate is consistent.The measurement of the corrosion rate of Cu-Ni alloy in static 3.5%Na Cl solution by using linear polarization method is feasible.Cu-Ni alloy under the erosive velocity being lower than critical flow rate has a lower corrosion rate,which can play a good role in protecting the material.

关 键 词：CU-NI合金 全浸腐蚀 电化学腐蚀 冲刷腐蚀 形貌 

分 类 号：TG172.5[金属学及工艺—金属表面处理] TG146.11[金属学及工艺—金属学]