Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 81, Issue -, Pages 56-60Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2017.06.004
Keywords
Simonkolleite; Zinc oxide; Microstructure; Corrosion
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Zinc substrates were electrochemically oxidized in NaCl solution to produce corrosion patinas. XRD, XPS and Raman analyses enabled the identification of simonkolleite and zinc oxide as the patina constituents. FIB-SEM imaging shows that the upper part of the patinas is a network of simonkolleite nanosheets with an open microstructure that is unlikely to act as a significant barrier for corrosion processes. STEM investigations and Raman mapping measurements reveal the presence of a ca. 20-400 nm thin nanoporous ZnO-rich film below the simonkolleite and covering the zinc substrate. Under potentiostatic conditions, the reduced cathodic activity of the patina-covered zinc electrodes is assigned to this nanoporous ZnO layer.
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