A new electrochemical noise technique for monitoring the localized corrosion of 304 stainless steel in chloride-containing solutions

Melissa L. Benish, Janusz Sikora, Barbara Shaw, Elzbieta Sikora, Max Yaffe, Abe Krebs, Gregory Martinchek

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations

Abstract

A new electrochemical noise technique was developed to investigate metastable pitting by applying a bias potential between two nominally identical working electrodes. The current flowing between the biased working electrodes was measured with a zero resistance ammeter. Potential was measured between one working electrode and a reference electrode. These tests were conducted using 304 stainless steel working electrodes in a 0.5 M NaCI + borate buffer solution. A bias potential of 150 to 200 mV was used to localize the anodic and cathodic reactions to their respective electrodes. The noise signal was significantly affected by conditioning the electrodes at open circuit. When the electrodes were conditioned for several days, the breakdown potential increased, and the frequency and magnitude of the current transients increased. However, when the conditioning time was increased to a month, all metastable pitting transients disappeared, indicating an enhanced passive film.

Original languageEnglish (US)
JournalNACE - International Corrosion Conference Series
Volume1998-March
StatePublished - Jan 1 1998
EventCorrosion 1998 - San Diego, United States
Duration: Mar 22 1998Mar 27 1998

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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