Localized Corrosion of Aluminum: Blister Formation as a Precursor of Pitting

被引:52
作者
Bargeron, C. B. [1 ]
Givens, R. B. [1 ]
机构
[1] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20810 USA
关键词
pit initiation; breakdown mechanism; voltage pulses;
D O I
10.1149/1.2133173
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Blisters have been observed in the oxide film of aluminum in aqueous chloride solutions. They can be initiated by short duration ((sic) 1 msec), low voltage pulses. Such blisters grow only if the steady-state potential of the specimen is above the pitting potential. The growth proceeds laterally along the oxide-metal interface. Upon breaking, as a result of gas pressure from within, pitting corrosion begins. Thus, in this instance, blisters are experimentally demonstrable precursors of pits.
引用
收藏
页码:1845 / 1848
页数:5
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