Thermogravimetry and acoustic emission <i>in situ</i>. An innovative solution for corrosion studies of metals and alloys at high temperatures - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2014

Thermogravimetry and acoustic emission in situ. An innovative solution for corrosion studies of metals and alloys at high temperatures

Apport d’un couplage innovant : l'émission acoustique associée à la thermogravimétrie, pour la compréhension de la corrosion des métaux et alliages à haute température.

Résumé

Context: ¤ Catastrophic oxidation of Zr alloy in oxidant atmosphere (detrimental effect of nitrogen) → 700°C-900°C (accidental conditions in nuclear plants) ¤ Catastrophic corrosion by metal dusting of Fe-based or Ni-based alloys in reducing environment with high carbon activity (ac > 1) → 400°C-700°C (petro-chemical or chemical plants) → Anticipate the breakage and life time prevision of material → In line monitoring of facilities with acoustic emission (EA) ================================= Method combining acoustic emission and thermogravimetry for an improved evaluation of the high temperature corrosion Summary: 1-TGA- in situ Acoustic Emission High-temperature corrosion Innovative solution : TGA + EA in situ 2-Oxidation of Zy 4 Test at high temperature : Zirconium alloy oxidation Oxygen /Nitrogen tests : Zircalloy 4 Rate of mass gain as a function of time Bursts average frequency variation as a function of time blank test (▲) Zircaloy-4 oxidation air test (●) Rate of mass gain and burst amplitude as a function of time Raman microscope (HORIBA JOBIN YVON -XPLORA) Pure oxygen tests : Zircalloy 4 AE signals recorded during cooling Typical AE burst waveform continuous wavelets Heat Flow variation as a function of temperature during cooling 3-Fe Metal dusting Metal dusting : iron at 650 °C Metal dusting : pre-oxidized iron at 650 °C Rate of mass gain of pre-oxidized iron at 650 °C Burst amplitude as a function of time Oxidation of Fe (20min) Oxidation of Fe (5min) Mechanism (Metal dusting of pre-oxidized iron ) 4-Conclusion 5-Developments
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Dates et versions

hal-01108999 , version 1 (23-01-2015)

Identifiants

  • HAL Id : hal-01108999 , version 1

Citer

Véronique Peres, Omar Al Haj, Richard Drogo, Eric Serris. Thermogravimetry and acoustic emission in situ. An innovative solution for corrosion studies of metals and alloys at high temperatures. Journée de séminaires Franco-Russe (projet CNRS PICS avec l'Université Fédérale de Sibérie, le CIRIMAT Toulouse et le Simap Grenoble), Jul 2014, Grenoble, France. ⟨hal-01108999⟩
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