论文部分内容阅读
本文采用旋转圆盘——圆环电极研究了黄铜(Cu37Zn)在1N Na_2SO_4及0.5N NaCl溶液中的阳极溶解行为。分别测出了黄铜阳极溶解时铜和锌的阳极溶解分电流密度。实验结果表明,Cu37Zn在上述两种介质中阳极溶解时均存在脱锌现象。在1N Na_2SO_4溶液中测得的脱锌系数强烈地依赖于阳极电位,而在0.5N NaCl溶液中,其脱锌系数与阳极电位的关系不明显。由黄铜中铜和锌的阳极极化曲线外推计算出了黄铜阳极溶解时锌和铜的腐蚀分电流密度,在1N Na_2SO_4溶液中分别为0.089及3×10~(-5)μA/cm~2,在0.5N NaCl溶液中分别为3.6及1.6μA/cm~2。实验还表明,黄铜在上述介质中的阳极溶解过程由扩散步骤所控制。
In this paper, the behavior of anodic dissolution of brass (Cu37Zn) in 1N Na_2SO_4 and 0.5N NaCl solution was investigated by rotating disc-ring electrode. The anodic dissolution current density of copper and zinc were measured respectively when the brass anode was dissolved. The experimental results show that there is dezincification in the anodic dissolution of Cu37Zn in the above two media. The dezincification coefficient measured in 1N Na_2SO_4 solution strongly depends on the anode potential, whereas in 0.5N NaCl solution, the dezincification coefficient has no obvious relationship with the anode potential. The corrosion partial current density of zinc and copper at the anodic dissolution of brass was calculated by extrapolation of anodic polarization curve of copper and zinc in brass. The corrosion current density of zinc and copper in 1N Na2SO4 solution were 0.089 and 3 × 10 ~ (-5) μA / cm ~ 2, respectively 3.6 and 1.6μA / cm ~ 2 in 0.5N NaCl solution. Experiments also show that the cathodic dissolution of brass in the above media is governed by the diffusion step.