Kinetics of passive film growth on Alloy 800 in the presence of hydrogen peroxide

Tirdad Nickchi, Akram Alfantazi

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Alloy 800 is one of the potential steel alloys to be used in the cooling system of the next generation of power plants. The corrosion behavior of the alloy is dominated by its passive film. The kinetics of passive film growth is the subject of this study. Long-term open circuit potential tests, along with polarization resistance and electrochemical impedance spectroscopy tests provide data on evolution of passive state on the metal surface. It shows that the metal would possibly be in the active region after 24 h of immersion in the absence of hydrogen peroxide while the alloy undergoes the active-passive transition in solution containing 10-4 M hydrogen peroxide. Polarization resistance data showed that the passive film continues thickening after OCP stabilization in the case of presence of H2O2. EIS data generally confirms the overall Rp behavior. The time-dependent EIS models were used for more in-depth evaluation of passive film kinetics.

Original languageBritish English
Pages (from-to)743-749
Number of pages7
JournalElectrochimica Acta
Volume58
Issue number1
DOIs
StatePublished - 30 Dec 2011

Keywords

  • Alloy 800
  • EIS
  • Hydrogen peroxide
  • Passive film

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