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

被引：0

作者：

Liu J. ^{[1
]}

Zhou Z. ^{[1
]}

Cao Z. ^{[1
]}

Zhang K. ^{[1
]}

Wang Y. ^{[1
]}

Xin S. ^{[1
]}

机构：

[1] College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang

来源：

Xiyou Jinshu/Chinese Journal of Rare Metals | 2020年 / 44卷 / 02期

关键词：

Corrosion electrochemistry; Cu-50Co bulk alloy; Liquid phase reduction; Mechanical alloying; Nanocrystalline;

D O I：

10.13373/j.cnki.cjrm.XY19100021

中图分类号：

学科分类号：

摘要：

In order to study the effect of preparation method and grain size on the corrosion properties of Cu-50Co bulk alloys. The coarse grained (CG) and nanocrystalline (NC) Cu-50Co 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-50Co bulk alloy were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD), and the corrosion properties of Cu-50Co 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-50Co(CG) bulk alloy decreased with the increase of NaCl solution concentration and corrosion resistance was enhanced, while those of MA Cu-50Co(NC), LPR Cu-50Co(CG) and LPR Cu-50Co(NC) bulk alloys increased, corrosion resistance was decreased. The nanocrystalline Cu-50Co 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-50Co bulk alloy, and in two methods LPR Cu-50Co (NC) bulk alloy had better corrosion resistance. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.

引用

页码：127 / 138

页数：11

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