Assessment of pitting corrosion in bare and passivated (wet scCO2-induced patination and chemical passivation) hot-dip galvanized steel samples with SVET, FTIR, and SEM (EDS)Show others and affiliations
2020 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176Article in journal (Refereed) Published
Abstract [en]
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 µm in width). With argon ion beam milling and latest energy-dispersive X-ray spectroscopy (EDS) technology, element maps with a high spatial resolution (≪100 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.
Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2020.
Keywords [en]
anodic dissolution, FTIR microscopy, passivation, pitting corrosion, scanning electron microscopy, zinc, Energy dispersive spectroscopy, Fourier transform infrared spectroscopy, Galvanizing, Ion beams, Mapping, Polishing, Sodium chloride, Steel corrosion, Chemical passivation, Corrosion mechanisms, Electrochemical activities, Energy dispersive X ray spectroscopy, High spatial resolution, Hot dip galvanized steels, Scanning vibrating electrode technique, Visual information, Pitting
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-45011DOI: 10.1002/maco.202011653Scopus ID: 2-s2.0-85084611702OAI: oai:DiVA.org:ri-45011DiVA, id: diva2:1432129
2020-05-262020-05-262024-08-13Bibliographically approved