Lean duplex stainless steels-The role of molybdenum in pitting corrosion of concrete reinforcement studied with industrial and laboratory castings

T. J. Mesquita, E. Chauveau, M. Mantel, N. Kinsman, V. Roche, R. P. Nogueira

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

The influence of Mo addition on pitting corrosion resistance of lean duplex stainless steels is not clearly understood in alkaline chloride conditions even if this element is widely recognized to increase corrosion resistance in acidic and neutral environments. This work aims to study the effect of Mo on pitting corrosion of lean duplex stainless steels in synthetic concrete pore solutions simulating degraded concrete. Results are discussed with respect to the influence of Mo on pitting potential for two industrial alloys in chloride rich and carbonated solution simulating concrete pore environments. To establish the real effect of Mo addition on lean duplex corrosion and passivation properties, two specific laboratory lean duplex alloys, for which the only difference is strictly the Mo content, are also studied. Mo presented a strong positive influence on the pitting corrosion resistance of industrial and laboratory lean duplex stainless steels in all studied chloride-rich solutions, but its effect is as less pronounced as the pH increases. In presence of Mo, pitting initiates and propagates preferentially in the austenitic phase at high temperature.

Original languageBritish English
Pages (from-to)967-972
Number of pages6
JournalMaterials Chemistry and Physics
Volume132
Issue number2-3
DOIs
StatePublished - 15 Feb 2012

Keywords

  • Concrete reinforcements corrosion
  • Duplex stainless steels
  • Microstructure
  • Molybdenum
  • Pitting corrosion
  • Simulated concrete pore solution

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