On the early stages of localised atmospheric corrosion of magnesium–aluminium alloys
| Autor: | Lars-Gunnar Johansson, Yu Cao, Mehrdad Shahabi-Navid, Mohsen Esmaily, Jan-Erik Svensson, Antoine Allanore, Nick Birbilis |
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| Rok vydání: | 2020 |
| Předmět: |
Multidisciplinary
Materials science Magnesium Precipitation (chemistry) 020209 energy Inorganic chemistry technology industry and agriculture chemistry.chemical_element Metals and alloys 02 engineering and technology 021001 nanoscience & nanotechnology Article law.invention chemistry X-ray photoelectron spectroscopy Aluminium law 0202 electrical engineering electronic engineering information engineering Fourier transform infrared spectroscopy Electron microscope 0210 nano-technology Layer (electronics) Dissolution |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-020-78030-w |
| Popis: | The surface film on pure magnesium and two aluminium-containing magnesium alloys was characterised after 96 h at 95% RH and 22 °C. The concentration of CO2 was carefully controlled to be either 0 or 400 ppm. The exposed samples were investigated using X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and electron microscopy. The results showed that when the alloys were exposed to the CO2-containing environment, aluminium cations (Al3+) was incorporated into a layered surface film comprising a partially “hydrated” MgO layer followed by Mg(OH)2, and magnesium hydroxy carbonates. The results indicated that aluminium-containing magnesium alloys exhibited considerably less localised corrosion in humid air than pure magnesium. Localised corrosion in the materials under investigation was attributed to film thinning by a dissolution/precipitation mechanism. |
| Databáze: | OpenAIRE |
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