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Chloride concentration distribution under convection diffusion coupling

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Document pages: 10 pages

Abstract: In order to predict steel corrosion and structural durability more accurately, the migration process of chloride ions under the coupling of convection and diffusion is analyzed. Considering the time-varying characteristics of diffusion coefficient and the time-space effect of convection velocity, the differential equation of chloride ion migration under the coupling of convection and diffusion is established. The chloride ion migration model is verified by using the existing experimental data and practical engineering data. The results show that when only diffusion is considered, the chloride ion concentration increases with time and decreases with the increase of time attenuation index. Under the convection diffusion coupling, at each point of couling region, the chloride ion concentration first increased and then decreased and tended to stabilize, and the maximum appeared at the moment of convection velocity being 0; in the diffusion zone, the chloride ion concentration increased over time, and the chloride ion concentration of the same location increased with the depth of convection (in the later period), the velocity of convection (in the early period), and the chloride ion concentration of the surface.

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