Numerical Predictions of Mild-Steel Corrosion in a H2S Aqueous Environment Without Protective Product Layers

Le résumé fourni par la source

The corrosion of mild carbon steel in a H2S aqueous environment without corrosion product layers is predicted using the computational fluid dynamics method. The Abe–Kondoh–Nagano low-Reynolds-number model is applied to predictions of hydrodynamics and mass transfer in a rotating cylinder electrode system. The flow domain in the system is modeled using three-dimensional geometries and meshed by grids with the first near-wall node at the position y+ = 0.1. The azimuthal velocity and mass transfer coefficient are predicted and validated with experimental data. User-defined functions based on the electrochemical model of H2S uniform corrosion are developed and interpreted with software. Corrosion rates of iron in dissolved H2S aqueous are predicted and compared with experimental data. Predicted corrosion rates are lower than experimental data with a relative error of 4% to 22%. The Abe–Kondoh–Nagano model shows credible and reliable performance in predicting the hydrodynamics, mass transfer, and H2S corrosion of a rotating cylinder electrode system.

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