Phytochemical characterization and corrosión inhibition of Lupinus mutabilis Sweet extracts

Corrosion is one of the most prejudicial problems in the industry, which can provoke multimillion-dollar losses. One possible solution is the use of traditional corrosion inhibitors. Nevertheless, the production of these inhibitors might generate a severe environmental impact. For this reason, it is necessary to develop new environmentally friendly inhibitors. This research aims to prove a wastewater from the production of Lupinus mutabilis Sweet as corrosion inhibitor. The seeds of L. mutabilis were boiled in water for one hour; this debittering water was subjected to a liquid-liquid extraction using methylene chloride and concentrated under reduced pressure to get 2.20 g of DCMe dry extract (0.40 % yield). A second extract was obtained from wastewater resulting from the cooking process, then lyophilized getting a 3.51 g of dry extract Le (2.34 % yield). Extracts characterization was carried out for different extracts using phytochemical screening, TLC, FT-IR spectroscopy, and quantitative analysis of alkaloids. The inhibition effect of L. mutabilis extracts on the corrosion of admiralty brass in an aqueous solution of 0.5 M hydrochloric acid was analyzed by electrochemical polarization tests. The DCMe and Le extracts showed a 35.17 % and 59.59 % inhibition efficiency respectively at 500 ppm 25 °C. The Le extract reached 85.47 % of IE % at 2 000 ppm 25 °C. The result shows that DCMe and Le extract could serve as an effective green-inhibitor for the corrosion of admiralty brass in acidic media.

• Autor Principal: Oleas Vanegas, Mateo Andres (author)
• Formato: bachelorThesis
• Idioma: eng
• Publicado: 2022
• Subjects: Lupinus mutabilis; Corrosión; Cobre admiralty; Inhibidor verde de corrosión; Admiralty brass; Green corrosion inhibitor
• Acceso en liña: http://repositorio.yachaytech.edu.ec/handle/123456789/539