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Oxidation Properties of Steel-T22 Alloy Coated by Simultaneous Ge-Doped 699 Chromizing-Siliconizing Process | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 26, Issue 6, 2008, Pages 699-709 PDF (422.82 K) | ||
| DOI: 10.30684/etj.29.6.11 | ||
| Author | ||
| Ahmed A. Moosa | ||
| Abstract | ||
| Diffusion coating was carried out at 1050 oC for 6 h under argon atmosphere by simultaneous Ge-doped chromizing-siliconizing process on low alloy steel type-T22. Cyclic oxidation tests were conducted for the uncoated and for the chromizing – Siliconizing coated steel-T22 alloy at 800 oC . For the Ge-dopded chromizingsiliconizing coated steel, the cyclic oxidation was carried out in the temperature range 600-800 oC in air for 100 h at 5 h cycle. The results showed that the oxidation kinetics for uncoated steel-T22 alloy in air at 800 oC follow a breakaway oxidation and the phases present are FeO (Wustite), Fe3O4 (Magnetite) and Fe2O3 (Haematite). The oxidation kinetics for chromizing –Siliconizing coated system in air at 800 oC was found to be parabolic. Oxide phases that formed on coated system are SiO2 and Cr2O3. The oxidation kinetics Ge-doped chromizing –Siliconizing coated system in air in the temperature range 600-800 oC was found to be parabolic .Oxide phases that formed on coated system are SiO2 and Cr2O3. The Ge addition improves the oxidation resistance of low alloy steel. | ||
| Keywords | ||
| Steel; Cyclic oxidation; Chromizing; Siliconizing; Pack Cementation | ||
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