The beneficial effect of ruthenium additions on the passivation of duplex stainless steel corrosion in sodium chloride solutions

El Sayed M. Sherif, J. H. Potgieter, J. D. Comins, L. Cornish, P. A. Olubambi, C. N. Machio

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

The effect of varying ruthenium contents of 0.00, 0.14, 0.22, and 0.28% on the corrosion of 22%Cr-9%Ni-3%Mo duplex stainless steel (DSS) after different immersion intervals in 3.5% NaCl solutions has been investigated. The study was carried out using open-circuit potential, potentiodynamic cyclic polarization, chronoamperometry, electrochemical impedance spectroscopy, and weight-loss measurements. Particular attention was paid to the effect of Ru on the pitting corrosion of DSS in the chloride solutions. Electrochemical measurements indicated that the presence of Ru passivates the DSS alloy by decreasing its corrosion parameters. Furthermore, it shifts the corrosion and pitting potentials to more positive values. This effect was found to increase with increasing Ru content and also with increased immersion time of the alloy in the chloride solution before measurements. Weight-loss time data after varied exposure periods (4-20 days) showed that the weight-loss and corrosion rate of DSS significantly decrease with increasing Ru contents.

Original languageEnglish
Pages (from-to)1364-1371
Number of pages8
JournalCorrosion Science
Volume51
Issue number6
DOIs
Publication statusPublished - Jun 2009
Externally publishedYes

Keywords

  • B. EIS
  • C. Passive films
  • Corrosion protection
  • Duplex stainless steel
  • Salt water

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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