烧结多孔Cu-Zn合金的脱合金行为  

Dealloying Behaviors of Sintered Porous Cu-Zn Alloys

作　　者：马研 杨卿[1,2] 孙少东 梁淑华[1,2] Ma Yan;Yang Qing;Sun Shaodong;Liang Shuhua(Xi'an University of Technology,Xi'an 710048,China;Shaanxi Province Key Laboratory of Electrical Materials and Infiltration Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学,陕西西安710048 [2]陕西省电工材料与熔渗技术重点实验室,陕西西安710048

出　　处：《稀有金属材料与工程》2019年第4期1336-1344,共9页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51471132);陕西省杰出青年科学基金(2018JC-027)

摘　　要：采用粉末冶金工艺制备微米多孔Cu-Zn合金前驱体,进而脱合金制备微纳米多孔铜。首先研究了烧结温度对前驱体合金微观结构的影响,然后对比了不同前驱体在不同浓度盐酸溶液中脱合金后的相组成和微观形貌,最后分析了前驱体合金在脱合金过程中的电化学行为。结果表明,以粉末冶金法与脱合金法相结合,可制备出微纳米双级多孔铜。不同烧结温度会造成前驱体合金的物相含量和孔结构发生变化,进而造成其脱合金过程的显著差异。Cu_(30)Zn_(70)前驱体包含Cu_5Zn_8与CuZn_5两相,脱合金时CuZn_5相优先被腐蚀;而Cu_(50)Zn_(50)前驱体仅含CuZn相,腐蚀速率更慢。在0.1mol/L腐蚀液中,试样不能完全脱合金;腐蚀液浓度增大至0.5 mol/L时,前驱体中的Zn完全脱去,微米级韧带由纳米多孔结构构成,其微米孔孔径为3.02～3.68μm,纳米孔孔径为157～183 nm。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 show that micro-/nano-porous coppers can be prepared by powder metallurgy and dealloying. Different sintering temperatures contribute to the variation of phase content and porous structure of Cu-Zn precursors, which then causes significant differences during dealloying process. Cu30Zn70 precursors consist of Cu5Zn8 and CuZn5, and CuZn5 is corroded preferentially during dealloying process.While Cu50Zn50 precursors consisting of single phase CuZn show a much slower corrosion rate. Both precursors are dealloyed incompletely in 0.1 mol/L HCl solution. When the concentration of HCl solution increases to 0.5 mol/L, Zn is completely dealloyed from both precursors and nanoporous structures form in micro-scale ligaments. The diameters of micro pores and nano pores are 3.02~3.68 μm and 157~183 nm, respectively.

关 键 词：微纳米多孔铜 粉末冶金 脱合金 微观结构 腐蚀行为 

分 类 号：TB383[一般工业技术—材料科学与工程]