1. Evaluation of Aqueous Coffee Husks Extracts as a Corrosion Inhibitor of 1020 Carbon Steel in 1 mol L-1 HCl Solution
- Author
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Lilian Ferreira de Senna, Dalva Cristina Baptista do Lago, and Samantha Alcântara Fernandes Ramos
- Subjects
Materials science ,Aqueous solution ,corrosion ,Carbon steel ,Mechanical Engineering ,Extraction (chemistry) ,1020 carbon steel ,natural inhibitors ,engineering.material ,Condensed Matter Physics ,Husk ,coffee husks ,Corrosion ,polyphenol contents ,Solvent ,Corrosion inhibitor ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Polyphenol ,engineering ,TA401-492 ,General Materials Science ,Materials of engineering and construction. Mechanics of materials ,Nuclear chemistry - Abstract
Corrosive processes in acidic medium reduce the performance and durability of metallic materials, causing problems to several industries. Corrosion inhibitors are commonly used to decrease these effects. As these inhibitors must be ecologically friendly currently, this work evaluated the anticorrosive effect of natural extracts of coffee husks (Coffea arabica L.) in the protection of carbon steel in 1 mol L-1 HCl solution. Extractions were performed using water as the extraction solvent. The polyphenols content increased with the extraction temperature, and the extracts were produced using 100 oC. Extract concentrations of 10, 20 and 30 % v/v were analyzed as inhibitors for carbon steel in acid medium, using weight loss and electrochemical tests, as well as scanning electron microscopy. There was an increase in the inhibition efficiency as the extract concentration increased, reaching values around 97 % using 30 %v/v of extract for the weight loss tests.
- Published
- 2019