Acoustic emission analysis coupled with thermogravimetric experiments dedicated to high temperature corrosion studies on metallic alloysReportar como inadecuado

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* Corresponding author 1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels 2 PRESSIC-ENSMSE - Procédés et REactivité des Systèmes Solide-gaz, Instrumentation et Capteurs 3 LGF-ENSMSE - UMR 5307 - Laboratoire Georges Friedel 4 IFPEN - IFP Energies nouvelles

Abstract : High temperature corrosion of metallic alloys like iron, nickel, zirconium alloys can damage equipment of many industrial fields refinery, petrochemical, nuclear …. Acoustic emission AE is an interesting method owing to its sensitivity and its non-destructive aspect to quantify the level of damage in use of these alloys under various environmental conditions. High temperature corrosive phenomena create stresses in the materials; the relaxation by cracks of these stresses can be recorded and analyzed using the AE system. The goal of our study is to establish an acoustic signals database which assigns the acoustic signals to the specific corrosion phenomena. For this purpose, thermogravimetric analysis TGA is coupled with acoustic emission AE devices. The oxidation of a zirconium alloy, zircaloy-4, is first studied using thermogravimetric experiment coupled to acoustic emission analysis at 900°C. An inward zirconium oxide scale, preliminary dense, then porous, grow during the isothermal isobaric step. The kinetic rate increases significantly after a kinetic transition breakaway. This acceleration occurs with an increase of acoustic emission activity. Most of the acoustic emission bursts are recorded after the kinetic transition. Acoustic emission signals are also observed during the cooling of the sample. AE numerical treatments using wavelet transform completed by SEM microscopy characterizations allows us to distinguish the different populations of cracks. Metal dusting represents also a severe form of corrosive degradation of metal alloy. Iron metal dusting corrosion is studied by AE coupled with TGA at 650°C under C4H10 + H 2 + He atmosphere. Acoustic emission signals are detected after a significant increase of the sample mass.

Keywords : Oxidation High temperature corrosion Thermogravimetric analysis Acoustic emission Metal Dusting

Autor: Eric Serris - Omar Al Haj - Jean Kittel - Véronique Peres - François Grosjean - Francois Ropital - Michel Cournil -



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