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马研,杨卿,孙少东,梁淑华.烧结多孔Cu-Zn合金的脱合金行为[J].稀有金属材料与工程(英文),2019,48(4):1336~1344.[Ma Yan,Yang Qing,Sun Shaodong and Liang Shuhua.Dealloying Behaviors of Sintered Porous Cu-Zn Alloys[J].Rare Metal Materials and Engineering,2019,48(4):1336~1344.]
Dealloying Behaviors of Sintered Porous Cu-Zn Alloys
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Received:December 27, 2017  Revised:January 28, 2018
Key words: micro-/nano-porous copper  powder metallurgy  dealloying  microstructure  corrosion behavior
Foundation item:国家自然科学基金(51471132);陕西省杰出青年科学基金
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Ma Yan,Yang Qing,Sun Shaodong and Liang Shuhua  
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      Microporous Cu-Zn were prepared by powder metallurgy, which were then employed as precursors to prepare micro-/nano-porous coppers by dealloying. Firstly, the effect of sintering temperature on the microstructures of Cu-Zn precursors was investigated. Then, the phase constitution and microstructures of Cu-Zn alloys after dealloying in HCl solutions with different concentration were compared. Finally, the electrochemical behavior of Cu-Zn precursors during dealloying process was analyzed. The results showed that micro-/nano-porous coppers can be prepared by powder metallurgy and dealloying. Different sintering temperature contributed to the variation of phase content and porous structure of Cu-Zn precursors, which then caused significant differences during delloying process. Cu30Zn70 precursors consisted of Cu5Zn8 and CuZn5, and CuZn5 was corroded preferentially during dealloying process. While Cu50Zn50 precursors consisting of single phase CuZn showed a much slower corrosion rate. Both precursors were dealloyed incompletely in 0.1mol/L HCl solution. When the concentration of HCl solution was increased to 0.5mol/L, Zn was completely dealloyed from both precursors and nanoporous structures were formed in micro-scale ligaments. The diameters of micro pores and nano pores were about 3.02~3.68μm and 157~ 183nm, respectively.