INFLUENCE OF HEAT TRANSFER CREVICE CONDITIONS ON STRESS CORROSION CRACKING IN LEAD FAULTED ALKALINE ENVIRONMENTS

摘要

Stress corrosion cracking (SCC) of Alloy 600 andAlloy 690 tubing was evaluated in a lead (Pb) faultedalkaline environment using a stressed tube boiling heattransfer test method developed to evaluate tubingmaterial corrosion performance under crevice conditions.Two thermal hydraulic conditions were evaluated fortheir influence on crevice chemistry and SCC. Thechemistry present within a heat transfer crevice isdependent on local thermal hydraulic conditions (e.g.,heat flux, temperature), the influence of sludge (e.g.,physical, chemical), and the chemical behavior (e.g.,solubility, electrodeposition) of the non-volatile speciesthat are concentrated in the crevice by boiling.Variations in SCC observed in these two tests wereconsistent with estimates of crevice chemistry for the twothermal hydraulic conditions.