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Modelling of the kinetics of pitting corrosion by metal dusting

Fabas, Aurélien and Monceau, Daniel and Doublet, Sébastien and Vande Put, Aurélie Modelling of the kinetics of pitting corrosion by metal dusting. (2015) Corrosion Science, 98. 592-604. ISSN 0010-938X

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Official URL: https://doi.org/10.1016/j.corsci.2015.05.061


Commercial 800HT alloy was exposed to 49.1%H2–12.8%CO–3.1%CO2–1.6CH4–33.4%H2O gas at 21bars and 570°C up to 5000h. Metal dusting attack by pitting was observed. The kinetics parameters were identified to be the incubation time, pit density and individual pit growth rate. These parameters were introduced in a nucleation-growth model to simulate the pitted surface area kinetics. This model was then extended to the volume considering several geometrical hypotheses. Considering only surface coalescence of the pits without their volume coalescence allowed to correctly reproduce the experimental mass loss kinetics. An even simpler conservative model was proposed for an easy lifetime modelling.

Item Type:Article
HAL Id:hal-02142998
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Air Liquide (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:29 May 2019 07:02

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