An overview of the oxidation performance of suicide diffusion coatings for vanadium-based alloys for generation IV reactors

N. Chaia (1) , Stéphane Mathieu (1) , T. Cozzika (2) , F. Rouillard (2) , C. Desgranges (2) , J. L. Courouau (2) , Carine Petitjean (1) , Nicolas David (1) , Michel Vilasi (1)

1 IJL - Institut Jean Lamour
2 LECNA - Laboratoire d'Etude de la Corrosion Non Aqueuse

This study focuses on the development of new protective coatings for the vanadium-based alloy V-4Cr-4Ti. Halide-activated pack-cementation (HAPC) technique was used to develop VxSiy multilayered diffusive suicide coatings. The outer layers (coatings) were formed of VSi2 doped with 27 at.% Cr or TiSi2. These compounds exhibited a very low oxidation rate at 650 degrees C, both in air and at a low oxygen pressure (He, 5 PPm O-2). The coatings formed mainly of MSi2 were found to be insensitive to pesting and largely unreactive to liquid sodium (<10 ppm O-2) during a 360 h compatibility test at 550 degrees C. (C) 2012 Elsevier Ltd. All rights reserved.

Domaines: Chimie inorganique

N. Chaia, Stéphane Mathieu, T. Cozzika, F. Rouillard, C. Desgranges, et al.. An overview of the oxidation performance of suicide diffusion coatings for vanadium-based alloys for generation IV reactors. Corrosion Science, 2013, 66, pp.285-291. ⟨10.1016/j.corsci.2012.09.031⟩. ⟨hal-01289979⟩