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Pb corrosion modelling

Pb corrosion modelling. System considered. Pb Cube 0.8 x 0.8 x 0.4 m Density 11340 kg/m 3 Oxidation layer 45 m m 6.3 mol Pb oxide Volume H 2 O 500 l. Pb. Equilibrium thermodynamic Pb + H 2 O pH = 6 Diagram Pourbaix diagram Solubility Dry Oxidation air

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Pb corrosion modelling

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  1. Pb corrosion modelling

  2. System considered • Pb • Cube • 0.8 x 0.8 x 0.4 m • Density • 11340 kg/m3 • Oxidation layer • 45 mm • 6.3 mol Pb oxide • Volume H2O • 500 l Pb

  3. Equilibrium thermodynamic Pb + H2O pH = 6 Diagram Pourbaix diagram Solubility Dry Oxidation air Equilibrium thermodynamic Pboxide + Pb + H2O Codes used Phreeqc Interactive 2.13.2 Solubility and speciation MEDUSA Predominance Speciation Data Base Hydra v. 18 Hydrochemical Equilibrium-Constant Database) Royal Institute of Technology ASM International's Binary Alloy Phase Diagrams Second Edition, Plus Updates on CD-ROM Modelling Steps and code used

  4. 1st step of working SPb = 2·10-7 M

  5. Air oxidation Reaction Path 1996 ASM

  6. Pb oxide + Pb dissolution • Pb + H2O • Pb(OH)2 Equilibrium phase • Lowest oxidised • Pb-oxide coat presence • Phase considered • Pb3O4 • PbO • PbO2(OH)2 • These phase increase the solubility  increase the amount of Pb sorbed by the resin

  7. Pb solubilty in DIW

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