Passivation of zinc in alkaline solution effected by chromates and CrO3-graphite system

被引:21
作者
Frackowiak, E [1 ]
Skowronski, JM [1 ]
机构
[1] Poznan Tech Univ, Inst Chem & Tech Electrochem, PL-60965 Poznan, Poland
关键词
zinc; passivation; chromate; CrO3-graphite;
D O I
10.1016/S0378-7753(97)02799-7
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electrochemical properties of porous zinc electrode in alkaline solution have been modified by the additive of chromium compounds such as chromates and CrO3-graphite system, insertion of chromates inside the zinc electrode caused the limited solubility of the anodic dissolution products and their retention in the electrode interior. Different behaviour of the passivated zinc electrode was observed depending on cation of the used chromate. The improvement of cyclic performance of zinc has also been noted after the electrode is admired with CrO3-graphite system containing intercalated/incorporated oxide. Electrochemical properties of zinc electrode strongly depend on the way of chromium insertion to active material of anode. Anodic and cathodic charges have been measured during potentiodynamic cycles for the observation of passivating effect. (C) 1998 Elsevier Science S.A. All rights reserved.
引用
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页码:175 / 181
页数:7
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