Corrosion behavior of deep cryogenically treated AISI 420 and AISI 52100 steel

Wei Wang, Venkateswaran Srinivasan, Sri Siva, Bensely Albert, Mohan Lal, Akram Alfantazi

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

In this work, the impact of deep cryogenic and tempering treatment on the corrosion behavior of AISI 420 (UNS S42000) and AISI 52100 (UNS G52986) steel in 3.5% sodium chloride (NaCl) and sodium bicarbonate (NaHCO3) + 0.25% NaCl solution was studied using open-circuit potential (OCP), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) measurements. The relationship of microstructure and the electrochemical response of differently treated samples was discussed. The results indicated that, compared with the conventional treatment, no significant modification of the electrochemical corrosion behavior after cryogenic treatments was observed. No passive behavior was observed for either AISI 420 or AISI 52100 in 3.5% NaCl, whereas it was observed in NaHCO3 + 0.25% NaCl solution. Different effects of tempering treatment on the corrosion behavior between AISI 420 and AISI 52100 were observed due to different modifications of the microstructure during the tempering process. The amount of retained austenite has a critical role in determining the pitting resistance. The pitting resistance increased with the amount of retained austenite.

Original languageBritish English
Pages (from-to)708-720
Number of pages13
JournalCorrosion
Volume70
Issue number7
DOIs
StatePublished - Jul 2014

Keywords

  • Austenite
  • Corrosion resistance
  • Heat treatment
  • Steel

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