Michelle Tinney

Undergraduate project: A mathematical model of the erosion-corrosion of Cr and WC in aqueous slurries

In studies of erosion-corrosion in aqueous slurries, there have been few attempts to combined the erosion map concept with the Pourbaix digram (which indicates the thermodynamic stability regimes for aqueous corrosion processes). Increasingly Cr and WC are being added to coatings to improve the wear and corrosion resistance in erosion-corrosion environments. However, there has been virtually no predictive modelling work carried out to date to establish the conditions where these alloy constituents may be beneficial or deleterious for the coating. In this work, a mathematical model is being developed to establish erosion-corrosion regimes for Cr and WC at a range of pHs. The changes in the mechanisms of erosion-corrosion are demonstrated on such maps for a range of pHs and impact velocities.

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