Electrochemical studies of packed iron powder electrodes: Effects of common constituents of natural waters on corrosion potential

James T. Nurmi, Paul G. Tratnyek

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Using a powder disk electrode (PDE) made with micron-sized, high purity iron metal we investigated how the corrosion of this material is affected by solution conditions that are relevant to the degradation of contaminants in environmental remediation applications. Changes in corrosion potential (Ecorr) with time showed that low pH, high concentrations of chloride, and natural organic matter led to breakdown of the passive film. Bicarbonate caused Ecorr to decline rapidly into the active potential region, but then Ecorr rose back into the passive region over 10s of hours. The rate of decline in Ecorr was greatest at higher pHs, suggesting a specific effect of HCO3- rather than a general effect of pH.

Original languageEnglish (US)
Pages (from-to)144-154
Number of pages11
JournalCorrosion Science
Volume50
Issue number1
DOIs
StatePublished - Jan 1 2008

Keywords

  • A. Iron
  • B. Electrochemistry
  • B. Potentiometry
  • C. Oxide coatings
  • C. Passive films

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Electrochemical studies of packed iron powder electrodes: Effects of common constituents of natural waters on corrosion potential'. Together they form a unique fingerprint.

  • Cite this