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Amélioration de la résistance à l'oxydation et à la corrosion à chaud de l'acier austénitique

Amélioration de la résistance à l'oxydation et à la corrosion à chaud de l'acier austénitique


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About the Book

Le revêtement par diffusion est réalisé par un processus simultané de chromage et de siliciage afin de déposer du chrome et du silicium à la surface d'un alliage d'acier inoxydable austénitique 316L, à l'aide d'un mélange contenant (67 % en poids de Cr, 8 % en poids de Si, 2 % en poids de NH4Cl, 23 % en poids d'Al2O3). Il a été constaté qu'un temps de revêtement par diffusion de 6 heures à 950 °C permettait d'obtenir une épaisseur de revêtement de 80 à 100 µm, composé principalement de phases CrSi2 et Cr3Si. Des essais d'oxydation cyclique ont été réalisés sur l'alliage austénitique 316L revêtu et non revêtu à une température comprise entre 700 et 900 °C pendant 52 heures à un cycle de 4 heures dans l'air. Les essais de corrosion cyclique à chaud de l'alliage austénitique 316L revêtu et non revêtu et de l'alliage austénitique 316L déposé avec 2 mg/cm2 de NaCl: Na2SO4 (100:0, 50:50 et 0:100 % en poids) sont réalisés à 850 °C pendant 52 heures à un cycle de 4 heures et avec 5 mg/cm2 (67 % en poids de V2O5 + 33 % en poids de Na2SO4) de dépôts aux températures d'essai (550, 650, 750, 850 et 950 °C) pendant 4 heures à chaque température. La cinétique d'oxydation de l'alliage inoxydable austénitique 316L non revêtu s'avère parabolique. Les valeurs de la constante de vitesse d'oxydation (kP) obtenues à 700, 800 et 900 °C dans l'air sont les suivantes: (1,77 x 10-10, 2,25 x 10-10, 3,36 x 10-10 (mg2.c).


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Product Details
  • ISBN-13: 9786208955854
  • Publisher: Editions Notre Savoir
  • Publisher Imprint: Editions Notre Savoir
  • Height: 229 mm
  • No of Pages: 116
  • Returnable: N
  • Weight: 218 gr
  • ISBN-10: 6208955858
  • Publisher Date: 21 Jun 2025
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Spine Width: 7 mm
  • Width: 152 mm


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