INFLUENCE OF CHLORIDE CONCENTRATION ON THE ACTIVE DISSOLUTION AND PASSIVATION OF NICKEL ELECTRODES IN ACID SULFATE-SOLUTIONS

被引:54
作者
REAL, SG
BARBOSA, MR
VILCHE, JR
ARVIA, AJ
机构
[1] Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Sucursal 4, Casilla de Correo 16
[2] Facultad de Ingenieria, Universídad del Centro de la Provincia de Buenos Aires
关键词
D O I
10.1149/1.2086772
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The influence of Cl− ion concentration on the active dissolution and passivation of polycrystalline nickel rotating disk electrodes in sulfuric acid-potassium sulfate solutions at pH 2.6 and 25°C was studied. The voltammetric data suggest that the passive layer results from a complex reaction involving the electrodissolution of the base metal, the formation of the anodic layer and its partial chemical dissolution. The influence of Cl− ions under different hydrodynamic conditions is discussed taking into account the competitive adsorption involving Cl− ions and species containing oxygen at the initial stages of the reaction yielding soluble products, and the appearance of Ni(OH)2 as a new phase. Solution stirring favors the electrodissolution reaction by increasing the transport rate of Cl− and H+ ions to the electrode surface, and simultaneously decreasing the thickness of the Ni(OH)2 layer. © 1990, The Electrochemical Society, Inc. All rights reserved.
引用
收藏
页码:1696 / 1702
页数:7
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