Kinetic modelling of Cr2O3 growth on a Ni-30Cr alloy in silicate melts

•A new analytical solution for oxidation-dissolution kinetics is established.•Equilibration of the silicate melt with air allows the formation of CrVI species.•The low diffusivity of CrVI limits the corrosion rate of Ni-30Cr in silicate melts. Corrosion tests of Ni-30Cr alloy were performed in three...

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Bibliographic Details
Published in:Corrosion science 2020-10, Vol.175, p.108873, Article 108873
Main Authors: Schmucker, E., Szczepan, V., Martinelli, L., Petitjean, C., Panteix, P.J., Ben Lagha, S., Vilasi, M.
Format: Article
Language:English
Subjects:
A. Alloy
A. Glass
B. Kinetic parameters
B. Modelling studies
B. SEM
Basicity
C. High temperature corrosion
Chromium oxides
Corrosion mechanisms
Corrosion tests
Dissolution
Melts
Modelling
Nickel chromium alloys
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Summary:•A new analytical solution for oxidation-dissolution kinetics is established.•Equilibration of the silicate melt with air allows the formation of CrVI species.•The low diffusivity of CrVI limits the corrosion rate of Ni-30Cr in silicate melts. Corrosion tests of Ni-30Cr alloy were performed in three simplified soda-silicate and borosilicate melts in order to follow the evolution of the protective chromia layer. A complete identification of the corrosion mechanisms enables the establishment of a kinetic model based on the oxide formation and dissolution rates. The dissolution kinetics is strongly dependent on the chromium solubility limit and diffusivity, which are related to the basicity and viscosity of the melts. This new modelling of the oxide growth is in good agreement with the experimental results.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2020.108873