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Journal of Materials Science

, Volume 42, Issue 12, pp 4535–4544 | Cite as

Some aspects of corrosion and film formation of austenitic stainless steel type 316LN using electrochemical impedance spectroscopy (EIS)

  • Mohan G. PujarEmail author
  • N. Parvathavarthini
  • R. K. Dayal
Article

Abstract

Corrosion and passive film characteristics of 316LN stainless steel with different degrees of cold work (0–25%) were studied using electrochemical impedance spectroscopy (EIS) and potentiodynamic anodic polarization techniques in deaerated acidic and alkaline (pH = 8) media. EIS measurements were conducted at open circuit potential (OCP) as well as after passivation in these media. Using the capacitance data from EIS measurements, film thickness was calculated. A definite correlation was observed between film thickness and corrosion rate after passivation. Analysis of the series capacitance and series resistance data from the EIS spectra showed that the films formed at OCP and after passivation were of semiconducting type. The nature of the semiconducting type of films was determined to be n-type using the ratios of anodic and cathodic transfer coefficients (αac).

Keywords

Electrochemical Impedance Spectroscopy Austenitic Stainless Steel Saturated Calomel Electrode Passive Film Open Circuit Potential 

Notes

Acknowledgement

The authors thank Dr. H.S. Khatak, Head, CSTD for his constant encouragement during the process of above investigation. The assistance of Smt. K. Parimala in preparing the specimens is gratefully acknowledged.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Mohan G. Pujar
    • 1
    Email author
  • N. Parvathavarthini
    • 1
  • R. K. Dayal
    • 1
  1. 1.Corrosion Science & Technology Section–Reactor Materials (CSTS–RM)Indira Gandhi Centre for Atomic ResearchKalpakkamIndia

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