Effects of Al, Ti, and Zr doping on oxide film formation in Co–29Cr–6Mo alloy used as mould material for Al die-casting
| Autor: | Yunping Li, Fenglin Wang, Kazuyo Omura, Yan Chen, Shi-Hai Sun, Huakang Bian, Ning Tang, Phacharaphon Tunthawiroon, Yuichiro Koizumi, Akihiko Chiba |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
General Chemical Engineering Diffusion Alloy Metallurgy Doping technology industry and agriculture Oxide General Chemistry Electron microprobe engineering.material equipment and supplies Chromia Corrosion chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy engineering General Materials Science |
| Zdroj: | Corrosion Science. 84:147-158 |
| ISSN: | 0010-938X |
| Popis: | The reactive-element (RE) effect in chromia-forming-alloys on the adherence properties of the oxide scale is well known. A comparative study of chromia scale in four Co–Cr–Mo alloys, an undoped and three doped with 0.5 wt% Al/Ti/Zr, is conducted under FESEM/EPMA, LSM, and XPS. After air oxidation at 700 °C for 24 h, all doped alloys show a thinner, smoother oxide scale with enhanced adherence. The cross-sectional compositional maps show significant increase in the concentration of Ti in the oxide scale, and Al near the oxide/alloy interface. The reactive elements inhibited the diffusion of Cr and O ions, formed oxide preferentially, and eliminated the void formation at the oxide/alloy interface. |
| Databáze: | OpenAIRE |
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