Stainless Steels as Sustainable Solution for Concrete Reinforcement - From Laboratory to Practice
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Date
2022
Publication Type
Journal Article
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yes
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Abstract
Stainless steel reinforcing bars show excellent corrosion resistance in concrete exposed to harsh environments. In this combined electrochemical and surface analytical work, an explanation for this behavior is proposed. XPS surface analytical results (thickness, composition of the passive film and of the interface beneath the film) obtained on black steel, FeCr alloys, and a series of stainless steels after exposure to alkaline solutions simulating concrete are reported. Pitting potentials were determined in the same solutions with electrochemical experiments. It is shown that the pitting potentials of the steels can be related to the Cr(III)oxy-hydroxide and Mo(VI) content in the passive film. It is proposed to calculate a Cr and Mo oxide equivalent similar to the well-known pitting resistance equivalent number (PREN). A correlation between the critical chloride content in concrete (reported in literature for CEM II A/LL and CEM I) and the pitting potential for carbon steel, Fe12%Cr alloy, DIN 1.4301 and DIN 1.4571 stainless steels is proposed to link results of solution analysis and performance in concrete.
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published
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Journal / series
Volume
919
Pages / Article No.
171 - 177
Publisher
Trans Tech Publications
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Subject
Stainless Steels; reinforcement; concrete; passivation; XPS surface analysis; pitting; critical chloride content
Organisational unit
02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.