An Electrochemical Approach to Predicting Corrosion Performance of Container Materials

by R. D. McCright, Lawrence Livermore Natl Lab, Livermore, United States,
J. C. Farmer, Lawrence Livermore Natl Lab, Livermore, United States,
D. L. Fleming, Lawrence Livermore Natl Lab, Livermore, United States,



Document Type: Proceeding Paper

Part of: High Level Radioactive Waste Management 1991

Abstract:

The pitting potentials of nickel-rich Alloy 825 are measured in chloride-containing solutions at different temperatures and adjusted to different pH values. The pitting potentials were determined by potentiodynamic polarization of Alloy 825 test specimens from the corrosion potential until a sharp increase in the electrochemical current indicated a breakdown of the protective passive film on the metal surface. Results show that Alloy 825 is susceptible to pitting attack in aggressive electrolytes containing more than 10,000 ppm chloride at 90?C and acicified to a pH value less than 2.5.

Subject Headings: Corrosion | Alloys | Radioactive wastes | Material tests | Chloride | pH | Waste storage

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