本文利用旋轉圓盤電極法研究溴酸鹽對鋅在氫氧化鉀溶液中陽極溶解行為的影響。實測結果顯示總溶解電流隨溴酸鹽濃度的提高而減小，又鈍化電位則因溴酸鹽的添加而增大，但迅達－飽和值，而該值乃隨電極轉速而異。再者Tafel斜率會因溴酸鹽的添加而減小。本研究依實驗結果提出－動力模式以闡明陽極溶解程序，並加以驗證。實驗觀測和模式預測頗相符，此乃支持本研究所提溴酸鹽的還原和鋅在氫氧化鉀溶液中陽極溶解乃並行反應的假定。
The effect of bromate ions on the anodic behavior of zinc electrodes in potassium hydroxide solutions has been investigated experimentally using the rotating disk electrode technique. The total dissolution current was observed to decrease with the increasing concentration of the bromate ions. The experiments also showed that the potential required for the onset of passivation increased anodically with the addition of potassium bromate but rapidly reached a stable value that depended on the hydrodynamic condition. The Tafel slope became smaller with the introduction of potassium bromate. Based on the experimental results, a kinetic model describing the dissolution process was developed and tested. Good agreement between the experimental results and the model predictions supports our hypothesis that the reduction of bormate proceeds in parallel with the anodic dissolution of a zinc electrode in alkaline electrolyte solutions.
Relation:
JOURNAL OF THE CHINESE INSTITUTE OF CHEMICAL ENGINEERS 37(3), pp.261-268
