A comparative study of hydrazine alternatives in simulated steam generator conditions—Oxygen reaction kinetics and interaction with carbon steel

Essi Jäppinen, Tiina Ikäläinen, Frej Lindfors, Timo Saario, Konsta Sipilä, Iva Betova, Martin Bojinov (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The efficiency of a range of hydrazine alternatives (carbohydrazide, diethyl-hydroxylamine, erythorbic acid and 2-butanone oxime) as oxygen scavengers and their interaction with carbon steel in simulated PWR steam generator inlet conditions are quantitatively compared. Kinetic parameters of oxygen reaction are estimated for the first time in such conditions using both an oxygen and a redox sensor. Electrochemical impedance measurements are performed to investigate the effect of studied alternatives on carbon steel corrosion. Using a quantitative interpretation of the impedance data by the Mixed-Conduction Model, the influence of hydrazine and its alternatives on charge transfer reactions at the oxide/solution interface and film growth/dissolution processes are discriminated. Conclusions are drawn on the comparative reaction rates of hydrazine alternatives with respect to oxygen consumption and steel passivation.
Original languageEnglish
Article number137697
JournalElectrochimica Acta
Volume369
Early online date31 Dec 2020
DOIs
Publication statusPublished - 10 Feb 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Carbon steel corrosion
  • hydrazine alternatives
  • Kinetic analysis
  • Oxygen reduction
  • Steam generator

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