LOCALIZED CORROSION BEHAVIOR OF CANDIDATE NUCLEAR WASTE PACKAGE CONTAINER MATERIALS (REPRINTED FROM PROCEEDINGS OF THE 5TH INTERNATIONAL-CONFERENCE ON NUCLEAR-ENGINEERING, MAY 1997)

Electrochemical cyclic potentiodynamic polarization experiments were p erformed on six types of alloys to evaluate their susceptibility to lo calized corrosion in aqueous environments relevant to the potential un derground, high-level nuclear waste repository. The effects of chlorid e ion (Cl-) concentration, pH, temperature, and electrochemical potent ial scan rate on the pitting/crevice corrosion behavior of these mater ials were investigated. The results indicated that alloys 825, G-3, an d G-30 suffered from pitting and crevice corrosion in all tested envir onments. Alloy C-4 showed localized attack in 90 degrees C brines, but alloys C-22 and Ti Grade-12 were immune to localized corrosion under all experimental conditions studied.