Corrosion behaviour of superferritic stainless steels cathodically modified with minor additions of ruthenium in sulphuric and hydrochloric acids

Peter Apata Olubambi, Johannes H. Potgieter, Lesley Cornish

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Cathodic modification of stainless steels with minor additions of noble metals and platinum group metals has proved to be an effective approach for improving their corrosion resistance in many reducing environments. In the present work, the effect of ruthenium on the corrosion behaviour of superferritic stainless steel containing approximately 0.05 and 0.2 wt% ruthenium in H2SO4 and HCl were studied using potentiodynamic polarization techniques. An improvement of the corrosion resistance in both media was observed with increasing ruthenium contents. The degree of corrosion resistance was higher in sulphuric acid. Increasing the amounts of ruthenium additions shifted the corrosion potential to a more positive value and caused a reduction in the active to passive transition, the reduction being substantial with 0.20 wt% Ru.

Original languageEnglish
Pages (from-to)1451-1457
Number of pages7
JournalMaterials and Design
Volume30
Issue number5
DOIs
Publication statusPublished - May 2009
Externally publishedYes

Keywords

  • Cathodic modification
  • Corrosion resistance
  • Ruthenium
  • Superferritic stainless steel

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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