Pouteria sapota as green CO2-corrosion inhibition of carbon steel

Original scientific paper

  • Guillermo Salinas-Solano Universidad Autonoma del Estado de Morelos, Centro de Investigación en Ingeniería y Ciencias Aplicadas, Av.Universidad 1001, 62209-Cuernavaca, Morelos, Mexico https://orcid.org/0000-0001-8392-0360
  • Jesus Porcayo-Calderon Universidad del Estado de Sonora, Departamento de Ingenieria QUimica y Metalurgica, Hermosillo, Sonora 83000, Mwxico https://orcid.org/0000-0002-6943-3926
  • Ana Karen Larios-Galvez Universidad Autonoma del Estado de Morelos, Centro de Investigación en Ingeniería y Ciencias Aplicadas, Av.Universidad 1001, 62209-Cuernavaca, Morelos, Mexico https://orcid.org/0000-0001-7654-2509
  • Jose Gonzalo Gonzalez-Rodriguez Universidad Autonoma del Estado de Morelos, Centro de Investigación en Ingeniería y Ciencias Aplicadas, Av.Universidad 1001, 62209-Cuernavaca, Morelos, Mexico https://orcid.org/0000-0002-5934-3126
Keywords: Acid corrosion, naturally occurring inhibitor, electrochemical impedance
Graphical Abstract

Abstract

Imidazoline obtained from the essential oil contained in Pouteria sapota seed was tested as an environmentally-friendly corrosion inhibitor of 1018 carbon steel in a CO2 saturated 3.5 % NaCl solution using electrochemical techniques. This imidazoline contains fatty acids with long hydrophobic chains, with 52.73 % of unsaturated (oleic and linolenic acids) and 40 % of saturated (palmitic and myristic acids) compounds. Polarization curves revealed that this inhibitor is a highly efficient mixed-type of inhibitor with the inhibitor efficiency of 99.9 % reached at 25 ppm. Also, the lowest pitting potential value was observed at 25 ppm of inhibitor, making the carbon steel highly susceptible to the pitting type of corrosion. Corrosion current density value decreased by nearly four orders of magnitude, and a passive film formation was induced for inhibitor concen­tra­tions higher than 5 ppm. Accordingly, polarization resistance values were increased from 100 W cm2 up to about 106 W cm2 at 25 ppm of inhibitor. The inhibitor forms a protective film of corrosion products adsorbed on the metal surface in a very strong chemical way, following a Langmuir type of adsorption isotherm. This was supported by electrochemical impedance spectra that showed two relaxation processes ascribed to electrode interface and film regions. In agre­ement with polarization resistance data, the total electrode resistance determined by inter­facial charge transfer and film resistance increased up to 8.2 ´ 105 W cm2 in the presence of 25 ppm of inhibitor. SEM images additionally showed that type of corrosion was fully changed from uniform to a localized type when 25 ppm of inhibitor was added into the solution.

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Published
31-01-2022
Section
Electrochemical Engineering