Effect of lead and applied potential on corrosion of carbon steel in steam generator crevice solutions

Martin Bojinov (Corresponding Author), Essi Jäppinen, Timo Saario, Konsta Sipilä, Aki Toivonen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

General corrosion behavior and stress corrosion cracking (SCC) susceptibility of carbon steel in simulated steam generator crevices are probed by voltammetry and electrochemical impedance spectroscopy, coupled to ex-situ characterization of the formed oxides and slow strain rate tests. Impedance spectra are interpreted using the Mixed-Conduction Model allowing for the extraction of oxidation and corrosion release rates. The results indicate a beneficial effect of lead on both general corrosion and SCC susceptibility of carbon steel near the corrosion potential. At anodic potentials, the negative effect of Pb on localized corrosion susceptibility is secondary to that of the applied potential.

Original languageEnglish
Article number108117
JournalCorrosion Science
Volume159
DOIs
Publication statusPublished - 1 Oct 2019
MoE publication typeA1 Journal article-refereed

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Keywords

  • Carbon steel
  • Electrochemical impedance spectroscopy
  • General corrosion
  • Steam generator
  • Stress-corrosion cracking

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