Corrosion Behavior of A216 Grade WCA Mild Steel and Ti Grade 12 Alloy in Hydrothermal Brines: Salt Repository Project: Annual Report, FY 1986.

摘要

The present document describes work performed at PNL during FY 1985 and FY 1986 that was directed toward characterizing the corrosion behavior of the candidate barrier materials in salt-repository- relevant, hydrothermal brine environments. The significant degradation modes of the materials were evaluated and prioritized, and the corresponding corrosion and environmental-mechanical work was performed. The objective of the work was to augment the material performance data base that will ultimately be used in the development of the predictive degradation models required for waste package licensing. The specific experimental objectives of the work performed through FY 1986 have been to quantify, to the degree possible, the rates of general corrosion of A216 steel; the susceptibility of this material to pitting, crevice corrosion, and stress-corrosion cracking; and the susceptibility of Ti Grade 12 to crevice corrosion and hydrogen absorption. These are the degradation modes judged potentially most deleterious (with the possible exception, for Ti Grade 12, of hydrogen-induced delayed failure) to the application of the two candidate barrier materials in a salt repository environment. 64 refs., 69 figs., 25 tabs. (ERA citation 13:056302)