Localized corrosion of low-carbon steel at the nanoscale
| Autor: | Timothy J. Kucharski, Ihsan Taie, Jeffery A. Aguiar, Khalid Hattar, Katherine L. Jungjohann, Michele L. Ostraat, Tatiana S. Pilyugina, Claire Chisholm, Paul G. Kotula, Steven C. Hayden, Rachael O. Grudt, Daniel Charles Bufford, William M. Mook |
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| Rok vydání: | 2019 |
| Předmět: |
Phase boundary
Materials science Carbon steel Cementite Materials Science (miscellaneous) Triple junction Metallurgy engineering.material Corrosion Galvanic corrosion chemistry.chemical_compound chemistry Chemistry (miscellaneous) Transmission electron microscopy Ferrite (iron) lcsh:TA401-492 Materials Chemistry Ceramics and Composites engineering lcsh:Materials of engineering and construction. Mechanics of materials |
| Zdroj: | npj Materials Degradation, Vol 3, Iss 1, Pp 1-9 (2019) |
| ISSN: | 2397-2106 |
| Popis: | Mitigating corrosion remains a daunting challenge due to localized, nanoscale corrosion events that are poorly understood but are known to cause unpredictable variations in material longevity. Here, the most recent advances in liquid-cell transmission electron microscopy were employed to capture the advent of localized aqueous corrosion in carbon steel at the nanoscale and in real time. Localized corrosion initiated at a triple junction formed by a solitary cementite grain and two ferrite grains and then continued at the electrochemically-active boundary between these two phases. With this analysis, we identified facetted pitting at the phase boundary, uniform corrosion rates from the steel surface, and data that suggest that a re-initiating galvanic corrosion mechanism is possible in this environment. These observations represent an important step toward atomically defining nanoscale corrosion mechanisms, enabling the informed development of next-generation inhibition technologies and the improvement of corrosion predictive models. |
| Databáze: | OpenAIRE |
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