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| STUDY OF ANODIC DISSOLUTION OF BRASS USING ROTATING RING DISC ELECTRODE |
| Zou Jinyun Gan Fuxing Liu Chuanzhong and Yao Luan (The Electrochemistry Laboratory; Wuhan University) |
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Abstract 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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Received: 25 June 1982
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