Electrochemical Evaluation of Caffeic Acid as an Eco-Friendly Corrosion Inhibitor for Brass and Copper in NaCl
- 1Institute of General and Ecological Chemistry, Lodz University of Technology, ul. Zeromskiego 116, 90-924 Lodz, Poland
- 2Department of Materials Engineering, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada
Abstract
Caffeic acid (CA) is one of the green corrosion inhibitors that can be efficiently applied in protection of metallic materials. Its inhibition properties were investigated for Cu and brass in 0.1 M NaCl solution using electrochemical techniques. The anticorrosion properties of CA was tested by applying coatings from its ethanol solutions and, for comparison, by adding CA directly to the corrosive medium. The effects of varying number of coating layers deposited from CA solutions of different concentrations were examined. The development of a durable coating that does not affect the appearance of the protected material could enable this method to be used for corrosion protection of historical heritage artefacts made of copper and brass. Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) measurements proved that CA applied in the form of coatings on Cu and brass was a more efficient protection method than modifying corrosive medium with this inhibitor. Increasing immersion time resulted in a better corrosion protection in the case of CA coating. The highest inhibition efficiency was achieved with 20 layers formed from 5 mM CA solution (86.5%) and 20 layers formed from 10 mM CA solution (81.4%) for Cu and brass, respectively. EIS measurements revealed an influence of diffusion on the corrosion rate both in the modified medium and in the case of CA coatings. The effectiveness of CA coatings on Cu and brass corrosion was further confirmed by SEM-EDS, XRD and TOF-SIMS measurements as well as experiments performed in a salt spray chamber.
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BibTeX
@article{kucharek2026electrochemical,
title = {{Electrochemical Evaluation of Caffeic Acid as an Eco-Friendly Corrosion Inhibitor for Brass and Copper in NaCl}},
author = {Aleksander Kucharek and Elżbieta Kuśmierek and Aleksandra Bednarek and Aleksandra Zimon and Waldemar Maniukiewicz and Kashif Mairaj Deen and Małgorzata Iwona Szynkowska-Jóźwik},
journal = {Molecules},
year = {2026},
month = oct,
doi = {10.3390/molecules31213837},
url = {https://www.mdpi.com/1420-3049/31/21/3837},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Electrochemical Evaluation of Caffeic Acid as an Eco-Friendly Corrosion Inhibitor for Brass and Copper in NaCl
AU - Aleksander Kucharek
AU - Elżbieta Kuśmierek
AU - Aleksandra Bednarek
AU - Aleksandra Zimon
AU - Waldemar Maniukiewicz
AU - Kashif Mairaj Deen
AU - Małgorzata Iwona Szynkowska-Jóźwik
PY - 2026
DA - 2026/10/23
JO - Molecules
DO - 10.3390/molecules31213837
UR - https://www.mdpi.com/1420-3049/31/21/3837
AB - Caffeic acid (CA) is one of the green corrosion inhibitors that can be efficiently applied in protection of metallic materials. Its inhibition properties were investigated for Cu and brass in 0.1 M NaCl solution using electrochemical techniques. The anticorrosion properties of CA was tested by applying coatings from its ethanol solutions and, for comparison, by adding CA directly to the corrosive medium. The effects of varying number of coating layers deposited from CA solutions of different concentrations were examined. The development of a durable coating that does not affect the appearance of the protected material could enable this method to be used for corrosion protection of historical heritage artefacts made of copper and brass. Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) measurements proved that CA applied in the form of coatings on Cu and brass was a more efficient protection method than modifying corrosive medium with this inhibitor. Increasing immersion time resulted in a better corrosion protection in the case of CA coating. The highest inhibition efficiency was achieved with 20 layers formed from 5 mM CA solution (86.5%) and 20 layers formed from 10 mM CA solution (81.4%) for Cu and brass, respectively. EIS measurements revealed an influence of diffusion on the corrosion rate both in the modified medium and in the case of CA coatings. The effectiveness of CA coatings on Cu and brass corrosion was further confirmed by SEM-EDS, XRD and TOF-SIMS measurements as well as experiments performed in a salt spray chamber.
SN - 1420-3049
ER -