PERIODIC BEHAVIOR IN THE IRON SULFURIC-ACID SYSTEM

被引:60
作者
RUSH, B [1 ]
NEWMAN, J [1 ]
机构
[1] UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720
关键词
D O I
10.1149/1.2048412
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Potentiostatic current oscillations observed during the anodic dissolution of an iron electrode in a sulfuric acid electrolyte are considered. This behavior has been experimentally characterized with respect to its potential dependence. A new mechanism has been developed that is consistent with observed behaviors and trends. This mechanism combines previously developed ideas concerning periodic behavior and passivation of iron with a new interpretation of precipitated salt-film behavior. The salt film is taken to be nonporous, serving as both a necessary precursor to oxide passivation as well as an effective passivating species itself. The mechanism is well corroborated by results from a mathematical model which also highlights the necessity of salt-film precipitation for the development of periodic behavior. Additionally, the issue of coherence is explicitly considered.
引用
收藏
页码:3770 / 3779
页数:10
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