Effect of the C = C double bond in biodiesel compounds on copper corrosion
Abstract
Biodiesel is a mixture of fatty acid methyl esters in which the chemical structure, hydrocarbon chain length, saturation or unsaturation, and position of the C = C double bond in each methyl ester influence the biodiesel’s properties. In this study, pure mixtures of short-chain methyl esters (methyl acrylate and methyl propionate, methyl 3-butenoate and methyl butyrate) were selected as model systems to evaluate the effect of the C = C bond on copper corrosion behavior. These methyl esters allowed the study of unsaturation as representative structures of some compounds present in commercial biodiesel. Mass loss tests, electrochemical measurements such as open-circuit potential, linear polarization resistance, electrochemical impedance spectroscopy, and electrochemical noise were performed over a 6-week exposure period, along with surface analysis using scanning electron microscopy (SEM). The results showed that adding a high concentration of unsaturated methyl esters increases the copper corrosion rate as exposure time increases. The chemical structure and electronic conjugation of the methyl esters influence the polarization resistance (R p ), charge transfer resistance (R ct ), and noise resistance (R n ) values. SEM analysis revealed a greater tendency toward localized pitting corrosion on the copper surface.
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BibTeX
@article{orea2026effect,
title = {{Effect of the C = C double bond in biodiesel compounds on copper corrosion}},
author = {Daniela Almazo Orea and Marlene Güemez Velazquez and Ana Karen Galvez Larios and Jorge L. Hernandez Morelos and America M. Ramirez Arteaga and Roy Lopez Sesenes and J. Gonzalo Gonzalez Rodriguez and Jesus Porcayo Calderon},
journal = {Scientific Reports},
year = {2026},
month = oct,
doi = {10.1038/s41598-026-75133-8},
url = {https://www.nature.com/articles/s41598-026-75133-8},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Effect of the C = C double bond in biodiesel compounds on copper corrosion
AU - Daniela Almazo Orea
AU - Marlene Güemez Velazquez
AU - Ana Karen Galvez Larios
AU - Jorge L. Hernandez Morelos
AU - America M. Ramirez Arteaga
AU - Roy Lopez Sesenes
AU - J. Gonzalo Gonzalez Rodriguez
AU - Jesus Porcayo Calderon
PY - 2026
DA - 2026/10/13
JO - Scientific Reports
DO - 10.1038/s41598-026-75133-8
UR - https://www.nature.com/articles/s41598-026-75133-8
AB - Biodiesel is a mixture of fatty acid methyl esters in which the chemical structure, hydrocarbon chain length, saturation or unsaturation, and position of the C = C double bond in each methyl ester influence the biodiesel’s properties. In this study, pure mixtures of short-chain methyl esters (methyl acrylate and methyl propionate, methyl 3-butenoate and methyl butyrate) were selected as model systems to evaluate the effect of the C = C bond on copper corrosion behavior. These methyl esters allowed the study of unsaturation as representative structures of some compounds present in commercial biodiesel. Mass loss tests, electrochemical measurements such as open-circuit potential, linear polarization resistance, electrochemical impedance spectroscopy, and electrochemical noise were performed over a 6-week exposure period, along with surface analysis using scanning electron microscopy (SEM). The results showed that adding a high concentration of unsaturated methyl esters increases the copper corrosion rate as exposure time increases. The chemical structure and electronic conjugation of the methyl esters influence the polarization resistance (R p ), charge transfer resistance (R ct ), and noise resistance (R n ) values. SEM analysis revealed a greater tendency toward localized pitting corrosion on the copper surface.
SN - 2045-2322
ER -