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| Format: | Artículo científico |
| Sprache: | en |
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Universidad de Antioquia
2017
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=43051470005 https://www.redalyc.org/journal/430/43051470005/ https://www.redalyc.org/journal/430/43051470005/html/ https://www.redalyc.org/journal/430/43051470005/43051470005.epub https://www.redalyc.org/journal/430/43051470005/movil |
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Inhaltsangabe:
- Effect of aeration on Tafelian behavior of the carbon steel corrosion in acid sulfate medium José Adrián Tamayo-Sepúlveda Ferley Alejandro Vásquez-Arroyave Jorge Andrés Calderón-Gutiérrez Ingeniería sulfate corrosion Tafel’s law Carbon steel oxygen diffusion This study presents a corrosion analysis of carbon steel by electrochemical polarization tests on a rotating disk electrode at several aeration and hydrodynamic conditions in solution 0.2 mol L-1 K2SO4 at pH 3. The reactions involved in the dissolution of the steel are analyzed by studying the Tafel regions of the polarization curves, confirming that the dissolved oxygen plays a predominant role in the corrosion of the metal. The corrosion rate was 35 times higher in natural aeration conditions than in the deaerated medium. Under natural aeration conditions, it is not possible to make a simple analysis of the corrosion of the steel from the extrapolation of the Tafel slopes since such slopes were not well defined due to the formation of rust in the anodic region and the influence of mass transport in the cathodic region. At cathodic polarization potentials and with natural aeration, there is an increase in polarization currents with respect to the deaerated system and the oxygen reduction reaction is controlled by the mass transport. Under deaerated conditions and at intermediate polarization potentials, there is a change in the dissolution mechanism of the steel. At high overpotential, the rate of dissolution of the steel tends to be equal in both systems, aerated and deaerated because the corrosion of the metal is controlled by the diffusion of species through corrosion products film. 2017 artículo científico 0120-6230 https://www.redalyc.org/articulo.oa?id=43051470005 https://www.redalyc.org/journal/430/43051470005/ https://www.redalyc.org/journal/430/43051470005/html/ https://www.redalyc.org/journal/430/43051470005/43051470005.epub https://www.redalyc.org/journal/430/43051470005/movil en http://www.redalyc.org/revista.oa?id=430 Revista Facultad de Ingeniería Universidad de Antioquia application/pdf Universidad de Antioquia Revista Facultad de Ingeniería Universidad de Antioquia (Colombia) Num.83