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Theses

Study of the initial satges of oxidation of stainless steels in high temperature water

Abstract : Steam Generator tubes (alloys 600, 690 and 800) are protected against corrosion by an oxide layer. The release of corrosion products into the primary water of the Pressurised Water Reactor is limited by this layer. Activation of these products increases the radioactivity. Breakdown of the passive film can lead to Stress Corrosion Cracking (SCC). The aim of this study is to understand the early stages of passivation of these alloys, in high temperature and high pressure water. A new micro-autoclave was developed to achieve short time exposures (from several seconds to ~10 minutes). The surfaces were characterised by XPS, NRA, STM and SEM and a kinetic model is proposed for the alloy 600. Longer oxidation times were studied (up to 400 hours). The kinetics obtained for short time oxidations were used to fit the long oxidation time behaviour. This reveals that the initial stages of oxidation are essential in the passive films growth in such conditions.
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https://pastel.archives-ouvertes.fr/pastel-00001039
Contributor : Ecole Chimie Paristech <>
Submitted on : Wednesday, February 16, 2005 - 8:00:00 AM
Last modification on : Wednesday, February 16, 2005 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 6:32:49 PM

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  • HAL Id : pastel-00001039, version 1

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Alexandre Machet. Study of the initial satges of oxidation of stainless steels in high temperature water. Chemical Sciences. Chimie ParisTech, 2004. English. ⟨pastel-00001039⟩

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