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Free keywords:
Anodic dissolution; Atmospheric corrosion; Passive films; Pitting corrosion; Zinc
Abstract:
A scanning flow cell with time-resolved downstream detection system is
employed to analyse the corrosion behaviour of zinc in weakly alkaline
hydrogen carbonate-containing electrolytes. Since zinc is usually
exposed to varying environmental conditions, dynamic electrolyte
exchange is used to investigate the impact of changing electrolyte
constituents over time for the first time. The polarization resistance
was monitored with galvanostatic pulses. Anodic current steps are
applied to correlate the overall net current to the rate of precipitate
formation. The results are complemented by investigations of the
morphological features of the corroded surfaces and precipitates
utilizing broad ion beam cross-sectioning techniques. (C) 2015 Elsevier
Ltd. All rights reserved.