Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 29    No. 7    July 2019

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Corrosion behavior of bulk two-phase Ag-25Cu alloys with different microstructures in NaCl aqueous solution
Zhong-qiu Cao1, Xiao-tong Yin1, Zhong-qiu Jia1, Qiu-yue Tian1, Jie Lu2, Ke ZHANG1, Yan WANG1

1. College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China;
2. Experimental Teaching Centre, Shenyang Normal University, Shenyang 110034, China

Abstract:In order to have a better understanding on the corrosion mechanisms of bulk two-phase Ag-25Cu (at.%) alloys with different microstructures, two bulk nanocrystalline Ag-25Cu alloys and one coarse grained counterpart were prepared by liquid phase reduction (LPR), mechanical alloying (MA) and powder metallurgy (PM) methods, respectively. Their corrosion behavior was investigated comparatively using electrochemical methods in NaCl aqueous solution. Results show that the microstructure of the coarse grained PMAg-25Cu alloy is extremely inhomogeneous. On the contrary, compared with PMAg-25Cu alloy, the microstructures of the nanocrystalline LPRAg-25Cu and MAAg-25Cu alloys are more homogeneous, especially for LPRAg-25Cu alloy. The corrosion rate of MAAg-25Cu alloy is higher than that of PMAg-25Cu alloy, but lower than that of LPRAg-25Cu alloy. Furthermore, the passive films formed by three Ag-25Cu alloys exhibit n-type semiconducting properties. The passive current density of LPRAg-25Cu alloy is lower than that of PMAg-25Cu alloy, but higher that of MAAg-25Cu alloy.

 

Key words: nanocrystalline; Ag-Cu bulk alloy; mechanical alloying; liquid phase reduction; microstructure; electrochemical corrosion

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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