Corrosion inhibition of carbon steel by extract of Buddleia perfoliata

  • Roy Lopes-Sesenes Universidad Autonoma del Estado de Morelos, CIICAP, Av. Universidad 1001, 62209-Cuernavaca, Mor.
  • Jose Gonzalo Gonzalez-Rodriguez Universidad Autonoma del Estado de Morelos, CIICAP, Av. Universidad 1001, 62209-Cuernavaca, Mor.
  • Gloria Francisca Dominguez-Patiño Uni­versidad Autonoma del Estado de Morelos, Facultad de Ciencias Biologicas, Av. Universidad 1001, 62209-Cuernavaca, Mor.
  • Alberto Martinez-Villafañe Centro de Investigaciones en Materiales Avanzados, Miguel Cervantes 120, Chihuahua

Abstract

Buddleia perfoliata leaves extract has been investigated as a carbon steel corrosion inhibitor in 0.5 M sulfuric acid by using polarization curves, electrochemical impedance spectroscopy and weight-loss tests at different concentrations (0, 100, 200, 300, 400 and 500 ppm) and temperatures, namely 25, 40 and 60 °C. Results showthat inhibition efficiency increases as the inhibitor concentration increases, decreases with temperature, and reaches a maximum value after 12 h of exposure, decreasing with a further increase in the exposure time. It was found that the inhibitory effect is due to the presence of tannines on this extract.

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Published
01-06-2012
Section
Electrochemical Science