About the Synergetic Influence of Manganese and Silicon on the Oxidation Rate of Chromia Forming Nickel-Based Model Alloys at 1050 °C
| Autor: | Yves Wouters, Y. Parsa, Michel Vilasi, Laurence Latu-Romain, Stéphane Mathieu, T. Perez |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Silicon 020209 energy Alloy Spinel Metals and Alloys Oxide chemistry.chemical_element 02 engineering and technology Manganese engineering.material 01 natural sciences Chromia Inorganic Chemistry Nickel chemistry.chemical_compound chemistry Chemical engineering 13. Climate action 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Materials Chemistry engineering Grain boundary diffusion coefficient |
| Zdroj: | Oxidation of Metals. 94:235-249 |
| ISSN: | 1573-4889 0030-770X |
| Popis: | The oxidation behavior of Si- and/or Mn-Ni-25Cr alloys at 1050 °C in air was studied to provide new insights on the effect of minor additions on chromia-scale growth. Four nickel alloys with and without Si or Mn were prepared. Thermogravimetry and post-oxidation characterizations evidenced that manganese increased, whereas silicon addition decreased chromia growth rate. On the contrary, addition of both Si and Mn to the Ni-25Cr alloy led to an unchanged oxidation rate in comparison with the unalloyed Ni-25Cr material. Oxide scales were characterized by photoelectrochemistry (PEC) to evaluate the role of the additions on the point defects nature. The n and p contributions of chromia forming in air were not changed by Si. On the opposite, Mn modified the scale conducting properties since only n contributions were observed for both chromia and Mn1+xCr2−xO4 spinel oxide with Mn-containing samples. In the latter case, the PEC contribution at ~ 3.2–3.4 eV was allocated to the signature of the Mn1+xCr2−xO4 spinel oxide. These data suggested that manganese enhances and silicon limits grain boundary diffusion in chromia scale as reactive element does. |
| Databáze: | OpenAIRE |
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