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Characterization of atmospheric corrosion products of zinc exposed to SO2 and NO2 using XPS and GIXD

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Abstract

A complete characterization of corrosion products formed on zinc plates after exposure in a climatic chamber was conducted in this study. The dry deposition of NO2, SO2, and SO2 + NO2, at 25 °C and 35 °C, and relative humidity (RH) of 90% was simulated. Pollutant concentrations evaluated were selected to represent highly polluted industrial atmospheric levels. Analysis techniques included X-ray Photoelectron Spectroscopy (XPS) and Grazing Incidence X-ray Diffraction (GIXD). For tests conducted at 25 °C, the relative amount of sulfate was determined to be higher in the SO2 + NO2 atmosphere than in the SO2 atmosphere, and was associated with greater corrosivity in the former atmosphere. NO2 had an indirect role as a catalyst for SO2 reduction to sulfate, as evidenced by the greater proportion of sulfate ions detected and the lack of nitrogen compounds in corrosion products. At 35 °C, effect of NO2 was reduced, and was complicated by a greater tendency for drying so that it was more difficult to maintain the humidity layer. Therefore, no accelerating effect of exposure temperature was observed.

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Acknowledgements

Juan G. Castaño expresses his gratitude to the Corrosion and Protection Group (Universidad de Antioquia, Colombia) and the “Francisco José de Caldas” Colombian Institute for the Development of Science and Technology – COLCIENCIAS, for the doctoral grant awarded.

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Authors and Affiliations

  1. Corrosion and Protection Group, Department of Materials Engineering, Universidad de Antioquia, P.O. Box 1226, Medellin, Colombia

    Juan G. Castaño & Carlos Arroyave

  2. National Center for Metallurgical Research – CENIM, Avda. Gregorio del Amo 8, 28040, Madrid, Spain

    Manuel Morcillo

Authors
  1. Juan G. Castaño
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  2. Carlos Arroyave
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  3. Manuel Morcillo
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Correspondence to Juan G. Castaño.

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Castaño, J.G., Arroyave, C. & Morcillo, M. Characterization of atmospheric corrosion products of zinc exposed to SO2 and NO2 using XPS and GIXD. J Mater Sci 42, 9654–9662 (2007). https://doi.org/10.1007/s10853-007-1964-4

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  • DOI: https://doi.org/10.1007/s10853-007-1964-4

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