The oxidation of industrial FeCrMo steel
| Autor: | Hendrik C. Swart, A. P. Greeff, C.W. Louw |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Auger electron spectroscopy
Materials science General Chemical Engineering High-temperature corrosion Erosion corrosion Alloy steel Metallurgy Alloy Oxide General Chemistry engineering.material Compacted oxide layer glaze Corrosion chemistry.chemical_compound chemistry engineering General Materials Science |
| Zdroj: | Corrosion Science. 42:1725-1740 |
| ISSN: | 0010-938X |
| DOI: | 10.1016/s0010-938x(00)00026-3 |
| Popis: | Fe–9Cr–1Mo steel is used as a corrosion resistant alloy in pressurised water reactors. The high steam temperature and pressure inside the reactors result in erosion corrosion. The steel’s hardness and resistance to various forms of corrosion are determined by the composition of the oxide layer formed on the alloy at elevated temperatures. Samples were taken from pieces of pipe removed after failure and have an operation history in excess of 20 years in a local power generation facility. The samples were oxidised in UHV for 1000 L between 157°C and 758°C. AES (Auger electron spectroscopy) and XPS (X-ray photo electron spectroscopy) depth profiles of the oxide layer were obtained at room temperature. At high oxidation temperatures the layer forms a duplex structure consisting of Fe oxide at the gas/oxide interface and Cr oxide at the oxide/metal interface. The ratio between these oxides is temperature dependent. Below 400°C the oxide layer consists mainly of Fe 2 O 3 and a small amount of Cr 2 O 3 at the metal/oxide interface. Between 400°C and 600°C the oxide layer consists of a mixture of FeO, Fe 2 O 3 and Cr 2 O 3 and above 600°C the layer consists mainly of Cr 2 O 3 . No influence of Mo or Ni on the oxidation process was measurable with the techniques used. |
| Databáze: | OpenAIRE |
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