Use of the hydrodistillation residue of the essential oil of pink pepper (Schinus terebinthifolius Raddi) in the corrosion protection of carbon steel in HCl medium

• Autor(a) principal: Nayara Maria Santos de Almeida
• Data de Publicação: 2022
• Outros Autores: Iago Magella Fernandes Costa Rossi e Silva, Brunela Pereira da Silva, Fernando Cotting, Idalina Vieira Aoki, Tacia Costa Veloso, Vera Rosa Capelossi
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFMG
• Texto Completo: https://doi.org/10.33448/rsd-v11i13.35797; http://hdl.handle.net/1843/60748; https://orcid.org/0000-0003-1933-6092; https://orcid.org/0000-0003-4639-2540; https://orcid.org/0000-0003-2560-6968; https://orcid.org/0000-0001-5980-0078; https://orcid.org/0000-0002-8203-2625; https://orcid.org/0000-0003-0444-7304; https://orcid.org/0000-0002-0212-8388
• topic: Corrosion; Natural Inhibitors; Pink pepper; SVET; Adsorption isotherms; Corrosão; Inibidores; Aroeira-vermelha; Equações matemáticas

In this research, different concentrations of the powder of the solid residue from the hydrodistillation of the pink pepper leaf (PRHPPL), generated in the production of its essential oil, were evaluated as an inhibitor forcarbon steel in HCl0.5 molL-1.This evaluation was performed using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, scanning vibrating electrode technique(SVET),and mass loss tests. All tests showed that the highest concentration of the inhibitor (1.77 gL-1) presentedbetter efficiency;fromicorr, this efficiency was 98 %, fromthe equivalent circuitmodelRctvalueit was 98 %and by the gravimetric test it was 86 %.Different isotherms were tested in order to better understand the adsorption process of the inhibitor molecules on the metal surface and the best fit wasfound forthe Langmuirisotherm. The morphology of the steelsurface was also analyzed by scanning electron microscopy (SEM). This study reveals that this residue obtained from the production of essential oils can be used as corrosion inhibitor inthe replacement to synthetic inhibitors.