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Construction of Erosion-Corrosion Maps for Pure Metals in Aqueous Slurries B. D. Jana and M. M. Stack

Construction of Erosion-Corrosion Maps for Pure Metals in Aqueous Slurries B. D. Jana and M. M. Stack Department of Mechanical Engineering, University of Strathclyde. Objectives:. Developing mathematical equation for erosion- corrosion problem

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Construction of Erosion-Corrosion Maps for Pure Metals in Aqueous Slurries B. D. Jana and M. M. Stack

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  1. Construction of Erosion-Corrosion Maps for Pure Metals in Aqueous Slurries B. D. Jana and M. M. Stack Department of Mechanical Engineering, University of Strathclyde

  2. Objectives: • Developing mathematical equation for erosion- corrosion problem • Developing a performance relationship between all the variables and parameters of erosion-corrosion in aqueous slurries in a map form • Easy way of representing such graphs

  3. Erosion Corrosion Phenomena Particle Particle Corrosion film Substrate Substrate

  4. Available Erosion Models at Normal Impact • Sundararajan and Shewmon: • Hutchings:

  5. Available Corrosion Models • Activation controlled kinetics (-Butler Volmer Equation) • Passivation controlled kinetics (-repassivation rate due to particle impact)

  6. Erosion-corrosion Work • “… combine wastage due to aqueous corrosion and mechanical erosion process…” • “…the total wastage can be significantly higher than the sum of the two processes…”

  7. Erosion-corrosion Rate • KC is the additive effect, and refers to the erosion enhancement of the corrosion rate. KE is the synergistic effect and refer to the influence of corrosion on the erosion rate

  8. Active Region For simplification, we neglect the additive effect and synergistic effect . So KC and KE is zero

  9. Passive Region • In the passive region KCO is neglected, only additive effect is considered

  10. KC and KE Determination in the Active Region

  11.  KC and KE Determination in the Passive Region

  12. Regime Map Boundaries Erosion dominated KC/KE  0.1 Erosion corrosion 0.1  KC/KE  1 corrosion erosion 1  KC/KE 10 corrosion dominated KC/KE  10

  13. Construction Methodology: Fe at Ph-7

  14. Pourbaix Diagram for All the Metals. Cu Fe Al Ni

  15. Maps of All the Metals for Ph 7 Fe Ni Cu Al

  16. Wastage Map Boundary LOW KE-C  1 MEDIUM 1  KE-C  10 HIGH KE-C  10

  17. Fe Ni Cu Al Wastage Map for All the Metals for Ph 7

  18. Comparison of Low Wastage of All the Metals-ph 7

  19. Conclusions • There is a significant difference between the regime and wastage map for all the metals. • The variation above is attributed to the differences in tribo-corrosion behaviour . • Al suffers high erosion corrosion due its less hardness than the other metals • Due to its high immunity, Cu suffers less erosion-corrosion than the other materials, under the conditions modelled.

  20. Thank You

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