Peer-Reviewed Journal Details
Mandatory Fields
Rudd, AL;Breslin, CB
2000
April
Journal of the Electrochemical Society
The influence of ultraviolet illumination on the passive behavior of zinc
Published
8 ()
Optional Fields
IMPEDANCE SPECTROSCOPY STABILITY ELECTRODES CORROSION FILM
147
1401
1407
The passive behavior of zinc in alkaline pH 13.0, 10.3, and 9.2 solutions, under dark and illumination conditions, has been studied using de polarization and ac impedance techniques. It was found that illumination with polychromatic light caused dissolution of anodically formed passive layers on zinc, with this photoinduced dissolution effect bring more pronounced in the more alkaline pH 13.0 solution. Photoinduced dissolution in the pH 10.3 and 9.2 solutions is explained in terms of the photodecomposition of ZnO through reaction with photogenerated holes. The more intense dissolution in the pH 13.0 solution is explained in terms of the photodecomposition of ZnO and the additional electrochemical dissolution in this alkaline solution which occurs as a result of the photodecomposition of the passive layer. Although the electrodes repassivated once the light source was removed, it was found that prior illumination led to a decrease in the donor densities and thus a modification of the defect structure of the passive layers. (C) 2000 The Electrochemical Society. S0013-4651(99)08-104-5. All rights reserved.
PENNINGTON
0013-4651
Grant Details