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。
The behavior of anodie dissolution of brass(Cu37Zn)was investigated in 1N Na_2SO_4 and 0.5N NaCl solutions with rotating ring-disc electrode. Partial anodic current densities of zinc and copper dissolution(i_(Zn) and i_(Cn)) of brass were measured respectively. Experimental results show that dezincification of Cu37Zn takes place in above mentioned media during anodic dissolution. Calculated dezincification factor of Cu37Zn Varies with electrode potential in 1N Na_2SO_4 solution. However, this factor does not vary significantly with electrode potential in 0.5N NaCl solution. By extrapolation of the partial polarization curves of copper and zinc for Cu37Zn, partial corros on current densities of zinc and copper have been calculated as follows: i_(corr)(Cu) i_(corr)(Zn) 1N Na_2SO-4 3×10~(-5)μA/cm~2 0.089μA/cm~2 0.5N NaCl 1.6μA/cm~2 3.6μA/cm~2 Experimental results also show that the rate of anodie dissolution of brass is mass-diffusion-controlled in both investigated media.
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