Journal
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Volume 71, Issue 10, Pages 1619-1628Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.202011653
Keywords
anodic dissolution; FTIR microscopy; passivation; pitting corrosion; scanning electron microscopy; zinc
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In this study, the local electrochemical activity of untreated and passivated (natural or chemical passivation) zinc specimens was observed during immersion in a 0.1-M NaCl solution. The localized anodic activity during the exposure, measured with the scanning vibrating electrode technique, was linked to zinc dissolution by the pitting corrosion mechanism. It was correlated to specific corrosion products characterized by Fourier transmission infrared (FTIR) microscopy. FTIR molecule maps were produced from individual pitting corrosion sites (100-200 mu m in width). With argon ion beam milling and latest energy-dispersive X-ray spectroscopy (EDS) technology, element maps with a high spatial resolution (MUCH LESS-THAN100 nm) were recorded from abrasion- and beam-sensitive corrosion products, showing a residual layer structure. This study demonstrates the capability of FTIR mapping, cross-section polishing, and state-of-the-art scanning electron microscopy imaging, and EDS element mapping to produce high-resolution elemental, molecular, and visual information about pitting corrosion mechanisms on a hot-dip galvanized steel sample.
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