Role of Na 2 CO 3 on an AISI 330 austenitic stainless steels oxidation at 900°C

Abstract : This work shows the influence of sodium carbonate coatings on the austenitic AISI 330 (Fe-35Ni-19Cr-1.3Si) oxidation during 48 h, at 900 °C. The N 2-5vol.% H 2 gaseous environment was used to simulate industrial heat treatment conditions. Silica scale formation is promoted by low oxygen containing gaseous environments and the high alloy silicon content. On this alloy an amorphous silica scale is formed after the blank material oxidation. It indicates that silicon is free to diffuse in the alloy and forms a silica scale at the internal interface. On Na 2 CO 3 coated specimens, no silica scale is formed. Then, sodium combines with silicon to form amorphous glass particles. A comparison has been performed with results obtained on a AISI 330Cb niobium containing alloy in the same oxidizing conditions. It is then concluded that sodium carbonate coatings could only favours silica formation on niobium containing alloy due to a reaction between sodium and niobium.
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Submitted on : Monday, September 30, 2019 - 9:46:39 AM
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Henri Buscail, C. Issartel, Frédéric Riffard, Sébastien Perrier, Françoise Rabaste, et al.. Role of Na 2 CO 3 on an AISI 330 austenitic stainless steels oxidation at 900°C. Materials and Corrosion / Werkstoffe und Korrosion, Wiley-VCH Verlag, 2019, 70 (8), pp.1416-1425. ⟨10.1002/maco.201810567⟩. ⟨hal-02300964⟩

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