Evaluation of Paullinia Cupana as a green corrosion inhibitor for carbon steel utilizing gravimetric and electrochemical noise techniques
| Autor: | L. A. Pocrifka, Rodrigo Fernando Brambilla de Souza, Marcelo dos Santos Pereira, Antonio dos Reis de Faria Neto, Raimundo R. Passos, Emerson C. Rios, Amanda Pires Nogueira de Souza |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), Univ Tecnol Fed Parana, Univ Fed Amazonas |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
corrosion Polymers and Plastics Carbon steel Metals and Alloys engineering.material food.food Surfaces Coatings and Films Electronic Optical and Magnetic Materials Corrosion Biomaterials green inhibitor Corrosion inhibitor chemistry.chemical_compound food Electrochemical noise chemistry engineering Paullinia cupana Gravimetric analysis electrochemical noise Paullinia Cupana Nuclear chemistry |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2019-10-04T12:36:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-07-01 FAPEAM Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) In view of the damage caused by corrosion and constant concern for the environment, the antioxidant properties found in Paullinia Cupana make it possible to apply this plant as a green corrosion inhibitor. Extract of Paullinia Cupana shell was used as a green inhibitor for the inhibition of mild steel corrosion in 1.0 M HCl and 0.5 M H2SO4 solution. The corrosion performance of the extract was evaluated using gravimetric, electrochemical noise (ECN), metallographic and Fourier transform infrared spectroscopy (FTIR) analyses. The gravimetric measurements showed that Paullinia Cupana shell presents a strong inhibitive characteristic, showing an efficiency of about 76.8% and 57.4% for HCl and H2SO4 acidic mediums, respectively, and the mechanism of action is physisorption. ECN allowed to analyze the variation of the corrosion charge over time, and about 8.6 and 2.2 times less charge generated with the inhibitor was observed in HCl and H2SO4 acidic mediums, respectively, and the type of localized corrosion also decreased. Metallographic analysis showed the efficiency of the inhibitor from micrographs of the electrodes before and after the electrochemical tests. Also, FTIR analysis showed compounds being consumed in H2SO4 medium indicating that this medium oxidizes the Paullinia Cupana compounds. Therefore, the results suggest that the Paullinia Cupana extract exhibits good inhibition in HCl medium. Univ Estadual Paulista, Dept Mat & Technol, Guaratingueta, SP, Brazil Univ Tecnol Fed Parana, Dept Mech, Curitiba, Parana, Brazil Univ Fed Amazonas, Dept Chem, Manaus, AM, Brazil Univ Estadual Paulista, Dept Mat & Technol, Guaratingueta, SP, Brazil |
| Databáze: | OpenAIRE |
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