Cu-50Co块体合金在NaCl溶液中的腐蚀性能研究  

Corrosion Properties of Cu-50Co Bulk Alloys in NaCl Solution

作　　者：刘嘉欣 周子力 曹中秋 张轲 王艳 辛士刚 Liu Jiaxin;Zhou Zili;Cao Zhongqiu;Zhang Ke;Wang Yan;Xin Shigang(College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 10034,China)

机构地区：[1]沈阳师范大学化学化工学院,辽宁沈阳10034

出　　处：《稀有金属》2020年第2期127-138,共12页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51271127);辽宁省重点研发计划项目(2018304025);辽宁省教育厅项目(LJC201911)资助。

摘　　要：为了研究制备方法及晶粒尺寸对Cu-50Co块体合金腐蚀性能的影响,本文采用机械合金化法(MA)通过控制球磨时间和液相还原法(LPR)通过控制表面分散剂的添加量,再借助真空热压技术制备了常规尺寸(CG)和纳米尺寸(NC)的Cu-50Co块体合金。利用扫描电子显微镜(SEM)和X射线衍射(XRD)对Cu-50Co块体合金的粒径、形貌进行表征,并通过电化学工作站对Cu-50Co块体合金进行开路电位、动电位极化曲线和交流阻抗谱测试,研究了合金的腐蚀性能。结果表明:随着NaCl溶液浓度的增加, MA Cu-50Co(CG)块体合金的腐蚀速度降低,耐蚀性能增强,而MA Cu-50Co(NC), LPR Cu-50Co(CG)和LPR Cu-50Co(NC)块体合金的腐蚀速度则增加,耐蚀性能降低;机械合金化法和液相还原法制备的纳米尺寸Cu-50Co块体合金的腐蚀电流密度均较小、电荷传递电阻较大、活化能较高。可见,纳米化可提高Cu-50Co块体合金的耐蚀性能,而两种方法制备得到的纳米晶Cu-50Co块体合金中, LPR Cu-50Co(NC)块体合金的耐蚀性能更好。In order to study the effect of preparation method and grain size on the corrosion properties of Cu-50 Co bulk alloys. The coarse grained(CG) and nanocrystalline(NC) Cu-50 Co alloyed powders were prepared by mechanical alloying(MA) through controlling ball milling time and liquid phase reduction(LPR) through controlling the amount of added surface dispersant, and then their corresponding bulk alloys were gotten by vacuum hot pressing technique. The particle size and morphology of Cu-50 Co bulk alloy were characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD), and the corrosion properties of Cu-50 Co bulk alloys were studied by electrochemical workstation by open-circuit potentials, potentiodynamic polarization curves and electrochemical impedance spectroscopy. The results showed that the corrosion rates of MA Cu-50 Co(CG) bulk alloy decreased with the increase of NaCl solution concentration and corrosion resistance was enhanced, while those of MA Cu-50 Co(NC), LPR Cu-50 Co(CG) and LPR Cu-50 Co(NC) bulk alloys increased, corrosion resistance was decreased. The nanocrystalline Cu-50 Co bulk alloys prepared by mechanical alloying and liquid phase reduction method had lower corrosion current densities, larger charge transfer resistances and higher activation energy. It could be seen that the nanocrystallization could improve the corrosion resistances of Cu-50 Co bulk alloy, and in two methods LPR Cu-50 Co(NC) bulk alloy had better corrosion resistance.

关 键 词：液相还原法 机械合金化法 Cu-50Co合金 纳米晶 腐蚀电化学 

分 类 号：TG178[金属学及工艺—金属表面处理]