The Effect of Chloride Ions on the Dissolution Behavior of Fe-Ni Alloys
AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OH
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The potentiostatic dissolution behavior of Fe-25Ni was studied to determine the effect of Cl- ion additions in IN H2SO4 at 25C. Specimens were dissolved at four potentials in the active and passive ranges and at three Cl- concentrations where large changes in dissolution behavior were expected. Current-time behavior, specimen weight change, and solution analysis for Fe and Ni were determined to characterize the dissolution behavior of the alloy. Current-time behavior and post-test surface characterization indicated that pitting occurred at all potentials and Cl- concentrations. Atomic absorption analysis for Fe and Ni in the solutions indicated that Cl- has no effect in the active dissolution of either component, increases in Cl- increase the dissolution of each in the passive range, and no enrichment or preferential dissolution of either component occurred under any exposure condition.
- Physical Chemistry
- Properties of Metals and Alloys