Ag60．7Al39．3合金的阳极极化行为和去合金化研究

研究了Ag60．7Al39．3合金在H2SO4中的阳极极化行为。线性扫描时，当电压大于临界电位后，随着H2SO4浓度增大，电流密度增长相应加快，而其自腐蚀电位相差不大。在0．1mol／L H2SO4中，0．5V的电压能腐蚀出海绵状的双连续多孔结构，孔径在微米级。0．8V的电压下所得到的银表面形貌呈平行的片状结构。1．0V和1．4V的电压下分别呈块状堆积形貌和波浪形形貌。在0．01mol／L H2SO4中得到的小孔径宽度〈200nm，在0．05mol／LH2SO4中腐蚀后得到的孔径宽度在300nm之间。表明降低H2SO4浓度减小腐蚀电压可得到纳米级的小孔。

The behavior of anodic polarization and dealloying in Ag60.7Al39.3 alloy

This paper presents the anodic polarization behavior of Ag60.7Al39.3 alloys in H2SO4 solution. As the potential surpass the critical potential, with increasing H2SO4 concentration, the growth rate of current density increases correspondingly, but the difference of corrosion potential is small. In 0.1mol/L H2SO4 solution, bi-continuous structure like sponge could be obtained at 0.5 V, the length scale is in micron; parallel sheet porous structure can be achieved at 0.8 V, and the piece morphology and wavy morphology are found at 1.0 and 1.4V, respectively. In 0.01mol/L H2SO4, the pore size could be less than 200 nm, and in 0.05mol/L H2SO4, the pore size is as large as 300 nm. That implies that lowering concentrations of H2SO4 and potential decrease length scale of porous Ag.