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Oxygen-iron interaction in liquid lead-bismuth eutectic alloy.

A Aerts1, S Gavrilov2, G Manfredi1

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Steel corrosion releases iron, a key impurity in liquid lead-bismuth eutectic alloys reacting with oxygen. This study quantifies iron-oxygen-magnetite equilibrium for managing corrosion and precipitates in lead-alloy systems.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Metallurgy

Background:

  • Liquid lead-bismuth eutectic (LBE) alloys are used in advanced nuclear systems.
  • Steel corrosion in LBE releases impurities, affecting system performance.
  • Understanding impurity behavior is crucial for operational reliability.

Purpose of the Study:

  • To investigate the role of iron as an impurity in LBE.
  • To characterize the iron-oxygen-magnetite equilibrium.
  • To quantify phenomena relevant to LBE system operation.

Main Methods:

  • Experimental analysis of steel corrosion in LBE.
  • Thermodynamic characterization of the iron-oxygen-magnetite system.
  • Quantitative modeling of impurity reactions.

Main Results:

  • Iron from steel corrosion is a significant impurity in LBE.
  • The iron-oxygen-magnetite equilibrium was successfully characterized.
  • Key phenomena for LBE system operation were quantified.

Conclusions:

  • The iron-oxygen-magnetite equilibrium provides a basis for corrosion control in LBE systems.
  • Quantification enables better management of precipitates and long-term operational stability.
  • Findings are critical for the design and maintenance of lead-alloy based installations.