Comparison of the Effect of Temperature on the Passivity Breakdown and Repassivation Potentials of Wrought and Welded Alloy 22 in 5 M CaC12

摘要

The study of the electrochemical behavior of wrought and welded Alloy 22 was carried out in 5 M CaC1(sub 2) at various temperatures. Comparisons were made between the electrochemical behaviors of the wrought and welded forms of Alloy 22 Multiple Crevice Assembly (MCA) specimens. The susceptibility to corrosion was found to increase with increase in temperature in both the wrought and the welded forms of the alloy: Nevertheless, the measure critical breakdown potential Eerit was found to be Similar for the wrought and welded specimens. Alloy 22 (N06022) is a nickel alloy rich in chromium and molybdenum, with a high degree of corrosion resistance. It exhibits a low general corrosion rate under most conditions and has formidable localized corrosion resistance in most environments compared with other nickel alloys. Consequently, Alloy 22 has emerged as the leading candidate for the fabrication of high-level nuclear waste containers, containers that are intended for use for disposal of high-level radioactive waste and spent nuclear fuel.