RT info:eu-repo/semantics/article
T1 Propolis as a green corrosion inhibitor for bronze in weakly acidic solution
A1 Souto, Ricardo Manuel
A1 Varvara, Simona
A1 Bostan, Roxana
A1 Bobis, Otilia
A1 Găină, Luiza
A1 Popa, Florin
A1 Mena, Vicente
K1 bronze corrosion
K1 propolis
K1 inhibitor
K1 electrochemical techniques
K1 SVET
K1 AFM
AB In the present work, the inhibitive action of natural propolis on bronze corrosion in a weakly acidic solution containing Na2SO4 and NaHCO3 at pH 5 was evaluated using multiscale electrochemical techniques, namely potentiodynamic polarization, electrochemical impedance spectroscopy and scanning vibrating electrode technique measurements. The major constituents of propolis were identified by HPLC. Surface characterization was performed by SEM-EDX and AFM analysis. Experiments were performed as a function of the propolis concentration and immersion time in the corrosive electrolyte. The obtained results showed that propolis presents good anticorrosive properties on bronze, acting as a mixed-type inhibitor, but its protective effectiveness is time-dependent. The highest inhibiting efficiency of 98.9% was obtained in the presence of 100 ppm propolis, after about 12 h of exposure to inhibitor-containing electrolyte through the stabilization of Cu2O on the bronze surface. The inhibitive properties of propolis on bronze corrosion are likely due to the adsorption of its main constituents (flavonoids and phenolic compounds), through the oxygen atoms in their functional groups and aromatic rings, which have been evidenced by FT-IR spectra. The adsorption of propolis on bronze was found to follow Langmuir adsorption isotherm.
YR 2017
FD 2017
LK http://riull.ull.es/xmlui/handle/915/18995
UL http://riull.ull.es/xmlui/handle/915/18995
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 25-abr-2024