Cerium phosphate-based inhibitor for smart corrosion protection of WE43 magnesium alloy
| Autor: | M.J. Carmezim, Maryna G. Taryba, Yegor Morozov, Lénia M. Calado, Maria de Fátima Montemor |
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| Rok vydání: | 2021 |
| Předmět: |
endocrine system
Materials science General Chemical Engineering chemistry.chemical_element 02 engineering and technology Yttrium engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Phosphate 01 natural sciences 0104 chemical sciences Corrosion Dielectric spectroscopy chemistry.chemical_compound Corrosion inhibitor Cerium Coating chemistry Electrochemistry engineering Magnesium alloy 0210 nano-technology Nuclear chemistry |
| Zdroj: | Electrochimica Acta. 365:137368 |
| ISSN: | 0013-4686 |
| Popis: | Ce(DEHP)3 (cerium tri(bis(2-ethylhexyl)phosphate)) is proposed as a self-healing corrosion inhibitor for WE43. The use of Ce(DEHP)3 in a 3.90 ± 0.54 µm hybrid epoxy-silane coating led to an improvement of the coating barrier properties. The presence of the inhibitor increased the corrosion resistance, and Electrochemical Impedance Spectroscopy tests carried out in 0.5 M NaCl revealed low frequency impedance modulus (0.01 Hz) around 109 Ω∙cm2. The pH-dependant self-healing effect of Ce(DEHP)3 was evidenced by localized electrochemical techniques, which revealed inhibition of corrosion propagation in artificial defects and decreased net cathodic current densities compared to an unmodified reference coating. Protective behaviour of Ce(DEHP)3 was related to the combined action of the cerium and organophosphate moieties of this inhibitor, in addition to the protective role of yttrium species derived from the yttrium present in the WE43 magnesium alloy. |
| Databáze: | OpenAIRE |
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