Corrosion of alloy 690 in simulated steam generator chemistry with boiling-effect of chloride and sulfate impurities

Konsta Sipilä, Tiina Ikäläinen, Tiina Lavonen, Timo Saario, Caitlin Huotilainen, Iva Betova, Martin Bojinov (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Enrichment of impurities occurs in steam generators of nuclear plants due to intense boiling conditions prevailing within them. In this work, deposition and release of chloride and sulfate impurities were studied using a dedicated water circulation loop with Alloy 690 as steam generator tubing. Electrochemical impedance spectroscopy was employed to follow in-situ the corrosion behavior in non-boiling, boiling and after-boiling conditions. Deposition/release of impurities is quasi-first-order vs. concentration. Interpretation of electrochemical impedance data using an updated version of the Mixed-Conduction Model allows to obtain reaction orders of oxide growth and corrosion release with respect to chloride and sulfate additives.

Original languageEnglish
Article number142129
JournalElectrochimica Acta
Volume447
DOIs
Publication statusPublished - 10 Apr 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Corrosion mechanism
  • Impurity deposition/release
  • Nickel-base alloy
  • Secondary coolant
  • Sub-nucleate boiling

Fingerprint

Dive into the research topics of 'Corrosion of alloy 690 in simulated steam generator chemistry with boiling-effect of chloride and sulfate impurities'. Together they form a unique fingerprint.

Cite this