Slow strain rate tests(SSRT) were conducted on alloy 690 in various lead chloride solutions and metal lead added to 100ppm chloride solution at 288°C. The corrosion potential(rest potential) for the alloy was measured with SSRT tests. The cracking was observed by metallographic examination and electron probe micro analyser. Also, the corrosion behavior of the alloy was evaluated by anodic polarized measurement at 30°C.

Resulting from the tests, cracking was characterized by cracking behavior, crack length and crack growth rate, and lead effects on cracking. The cracking was mainly intergranular in mode, approximately from 60 um to 450 um in crack length, and approximately 10-6 to 10-7 mmS-1 in crack velocity. The cracking was evaluated through the variation the corrosion potential in potential-time and lead behavior during SSRTs. The lead effect in corrosion was evaluated through active to passive transition behavior in anodic polarized curves. The corrosion reactions in the cracking region were confirmed by electron probe microanalysis.

Subject
Crack growth, Materials, Intergranular stress corrosion cracking, Corrosion rate, Corrosion cracking, Stress cracking, Chloride solutions, Lead, Intergranular cracking, Alloys, Corrosion potential, Stress corrosion cracking, Chloride stress corrosion cracking
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1996
Association for Materials Protection and Performance (AMPP)
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