Propolis as a green corrosion inhibitor for bronze in weakly acidic solution
| Autor: | Roxana Bostan, Luiza Gaina, Vicente Mena, Simona Varvara, Florin Popa, Ricardo M. Souto, Otilia Bobis |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
General Physics and Astronomy 02 engineering and technology Electrolyte engineering.material 010402 general chemistry 01 natural sciences Corrosion Corrosion inhibitor chemistry.chemical_compound symbols.namesake Adsorption Bronze bronze corrosion SVET Metallurgy Langmuir adsorption model Surfaces and Interfaces General Chemistry Propolis 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Dielectric spectroscopy propolis inhibitor electrochemical techniques chemistry engineering symbols AFM 0210 nano-technology Nuclear chemistry |
| Zdroj: | RIULL. Repositorio Institucional de la Universidad de La Laguna Universidad de La Laguna (ULL) |
| ISSN: | 0169-4332 |
| Popis: | In the present work, the inhibitive action of natural propolis on bronze corrosion in a weakly acidic solution containing Na 2 SO 4 and NaHCO 3 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 Cu 2 O 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. |
| Databáze: | OpenAIRE |
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