The effect of molybdenum on the corrosion performance of stainless steel in chloride-contaminated and carbonated concrete

Abstract:

Due to the increase application of stainless steels as reinforcement in con-crete structures, understanding the behaviour of these alloys in media that simulate concrete pore water or in the concrete itself is extremely important for the selection of the most suitable alloy. This paper is a contribution to the understanding of the role of Mo in the corrosion resistance in concrete structures contaminated with chloride ions after carbonation. In order to study the role of Mo, samples of ferritic, austenitic and duplex stain-less steels were produced in laboratory with controlled levels of Mo. These samples were prepared based on the chemical composition of commercial stainless steels. The samples were immersed in simulated carbonated and noncarbonated con-crete pore solutions, both with the addition of 3.5% of sodium chloride. Samples of these steels were also embedded in concrete that was later carbonated and exposed to saline solution. The performance of the steels in concrete was verified through corrosion po-tential monitoring (several months) followed by electrochemical experiments (anodic polarization). Finally, the optical and electronic microscopy techniques were used to characterize the corrosion attacked surfaces.


Reference:

MESQUITA, Thiago; PANOSSIAN, Zehbour; ARAUJO, Adriana de; SANTOS, Célia Aparecida Lino dos; NOGUEIRA, Ricardo P. The effect of molybdenum on the corrosion performance of stainless steel in chloride-contaminated and carbonated concrete. EUROPEAN CORROSION CONGRESS, 2012, Stambul. Proceedings… Stambul, EFC, 2012. 17p. (CD)

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