Characteristics of lead induced stress corrosion cracking of alloy 690 in high temperature

Koo Kab Chung, Jae Kyoo Lim, Yutaka Watanabe, Tetsuo Shoji

Research output: Contribution to journalConference articlepeer-review

Abstract

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 potentiaKrest 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 urn to 450 urn 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.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
Volume1996-March
Publication statusPublished - 1996 Jan 1
EventCorrosion 1996 - Denver, United States
Duration: 1996 Mar 241996 Mar 29

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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