硝酸介质对铝箔直流脉冲电蚀电流密度的影响

Effects of the nitric acid on the current density during DC impulse etching of aluminum foil

通过在硫酸一盐酸混合电解质中加入硝酸，研究了在直流脉冲电蚀铝箔的过程中，硝酸介质对电蚀电流密度的影响。结果表明：在硫酸和盐酸电解质体系中，直流脉冲的峰值电流密度需大于0．8A·cm^-2。才能在铝箔表面生成隧道孔，但在加入0．2～0．3mol／L硝酸后可将生成隧道孔所需的电流密度降至0．3A·cm^-2。在3mol／L硫酸及1mol／L盐酸的混合溶液实验条件下，电解质中适宜的硝酸浓度为0．2mol／L。

The effects of current density after adding nitric acid into H2SO4-HCI system during DC impulse etching of aluminum foil were discussed. The results show that the tunnels can be formed while controlling DC impulse current density above 0.8A·cm^-2 in H2SO4-HCI electrolyte system. It＇s obviously that the current density can be lower to 0.3A·cm^-2 by adding nitric acid at the concentration of 0.2-0.3 mol/L. Under the condition of mixed solution of 3 mol/L H2SO4 and 1 mol/L HCI, the proper concentration of nitric acid is 0.2 mol/L.