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98149 Repassivation Potential for Locafized corrosion of A11OYS625 and C22 in Simulated Repository Environments

Picture for 98149 Repassivation Potential for Localized
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Product Number: 51300-98149-SG
ISBN: 98149 1998 CP
Author: K.A. Gruss, G.A. Cragnolino, D.S. Dunn, N. Sridhar
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Two corrosion resistant nickel-based alloys, 625 and C22, have been selected by the U.S. Department of Energy as candidate materials for the inner container of high-level radioactive waste packages. The susceptibility of these materials to localized corrosion was evaluated by measuring the repassivation potential as a function of solution chloride concentration and temperature using cyclic potentiodynamic polarization and lead-in-pencil potential step test methods. At intermediate Cl- concentrations, e.g., 0.028- 0.4 M, the repassivation potential of alloy 625 is greater than that for alloy 825 and is dependent on the Clconcentration. However, at higher concentrations, the repassivation potential is slightly less than that for alloy 825 and is weakly dependent on Cl- concentration. The repassivation potentials for alloy C-22 under all test conditions are considerably higher than those of either alloy 625 or 825 and are in the range where oxygen evolution is expected to occur. Keywords: alloy 625, alloy C22, chloride, localized corrosion, crevice corrosion, nuclear waste, potential, repassivation potential, repository environments, cyclic potentiodynamic polarization, lead-in-pencil
Two corrosion resistant nickel-based alloys, 625 and C22, have been selected by the U.S. Department of Energy as candidate materials for the inner container of high-level radioactive waste packages. The susceptibility of these materials to localized corrosion was evaluated by measuring the repassivation potential as a function of solution chloride concentration and temperature using cyclic potentiodynamic polarization and lead-in-pencil potential step test methods. At intermediate Cl- concentrations, e.g., 0.028- 0.4 M, the repassivation potential of alloy 625 is greater than that for alloy 825 and is dependent on the Clconcentration. However, at higher concentrations, the repassivation potential is slightly less than that for alloy 825 and is weakly dependent on Cl- concentration. The repassivation potentials for alloy C-22 under all test conditions are considerably higher than those of either alloy 625 or 825 and are in the range where oxygen evolution is expected to occur. Keywords: alloy 625, alloy C22, chloride, localized corrosion, crevice corrosion, nuclear waste, potential, repassivation potential, repository environments, cyclic potentiodynamic polarization, lead-in-pencil
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