Passivation of duplex stainless steel in solutions simulating chloride-contaminated concrete

Authors

  • A. Bautista Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Química, Universidad Carlos III de Madrid
  • G. Blanco Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Química, Universidad Carlos III de Madrid
  • F. Velasco Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Química, Universidad Carlos III de Madrid
  • A. Gutiérrez Departamento de Física Aplicada. Universidad Autónoma de Madrid
  • S. Palacín Departamento de Física Aplicada. Universidad Autónoma de Madrid
  • L. Soriano Departamento de Física Aplicada. Universidad Autónoma de Madrid
  • H. Takenouti UPR-15 du CNRS, UPMC, París

DOI:

https://doi.org/10.3989/mc.2007.v57.i288.62

Keywords:

stainless steel, chlorides, reinforced concrete, corrosion, passivation

Abstract


Most studies published to date on the corrosion behaviour of stainless reinforcing steel are based on austenitic steel. The market presence of corrugated duplex steel is growing, however. The present study compared passivity in 2205 type duplex and 304 type austenitic stainless steel. Polarization tests in chloride-containing Ca(OH)2 solutions confirmed the exceptional performance of duplex steels. X-ray photoelectronic spectroscopy (XPS) showed that the passive layer generated on duplex stainless steel in media simulating concrete pore solutions had a higher Cr content than the layer formed on steel in contact with the air. The XPS results also revealed that in duplex steel the form adopted by the passive layer Fe oxides was Fe3O4 in the solutions simulating concrete, rather than Fe2O3, as in duplex steel exposed to air. Electrochemical impedance spectroscopy (EIS) can be used to monitor the transformations taking place in the passive layer and analyze the factors involved.

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Published

2007-12-30

How to Cite

Bautista, A., Blanco, G., Velasco, F., Gutiérrez, A., Palacín, S., Soriano, L., & Takenouti, H. (2007). Passivation of duplex stainless steel in solutions simulating chloride-contaminated concrete. Materiales De Construcción, 57(288), 17–32. https://doi.org/10.3989/mc.2007.v57.i288.62

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