| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1469860 | Corrosion Science | 2011 | 7 Pages |
Steam oxidation resistance and thermal stability were studied at 650 °C for a coating with an outer Ni2Al3 layer and an inner Fe2Al5 layer formed on P92 steel surface. The parabolic rate law of oxidation was obeyed only in less than 2000 h with positive deviations occurring at longer oxidation times. The outer layer of the coating was transformed to NiAl during oxidation, but it remained stable once it was formed. The mechanisms for the enhanced thermal stability were discussed and a simple approach to enhancing the lifetime of the coating was proposed.
Research highlights► The Ni2Al3/Fe2Al5 duplex coating on ferritic steel is resistant against steam oxidation at 650 °C. ► The coating shows evidence of enhanced thermal stability. ► The enhanced thermal stability of the coating is facilitated by thermodynamic constraints. ► The lifetime of the coating can be enhanced by controlling the layer structure of the coating.
