Microbiological influence on the electro-chemical potential of stainless steel

P. Gümpel, N. Arlt, J. Telegdi, D. Schiller, O. Moos

Research output: Contribution to journalArticle

8 Citations (Scopus)


The microbiologically caused ennoblement appears in natural water on all stainless steels equally and can only be prevented by the use of biocides. Temperature and supply of nutrients have an influence on the increasing rate of the potential, as well as the presence of manganese ions in the water favors the potential rise. The final value of the potential is substantially regulated by the biological system and is independent of the steel composition. An endangerment of stainless steels by a selective corrosion attack e.g. pitting corrosion arises if the critical repassivation potential of the steel lies below the open-circuit potential appearing in the natural system. This can be due to the alloy composition or due to process-conditioned weakening of the passive layer, for example by annealing colors on and beside welded joints.

Original languageEnglish
Pages (from-to)715-723
Number of pages9
JournalMaterials and Corrosion
Issue number9
Publication statusPublished - Sep 2006

ASJC Scopus subject areas

  • Environmental Chemistry
  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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