Electrochemical and Economic Evaluation of the Cocoa Bean Shell as a Corrosion Inhibitor in Acidic Medium

The inhibition effect of the cocoa bean shell powder (CBSP) on SAE 1008 carbon steel was studied in acidic medium (HCl 0.5 mol L-1) by electrochemical techniques and gravimetric measurements. Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) were used to the chemi...

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Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2022-01, Vol.25, p.1
Main Authors: Carvalho, Mayara Cristina Fernandes de, Almeida, Nayara Maria Santos de, Silva, Iago Magella Fernandes Costa Rossi e, Cotting, Fernando, Aoki, Idalina Vieira, Capelossi, Vera Rosa
Format: Article
Language:English
Subjects:
Carbon Steel
Carbon steels
Cocoa bean shell
Cocoa beans
Corrosion
Corrosion effects
Corrosion inhibitors
Corrosion products
Corrosion rate
Economic models
EIS
Electrode polarization
ENGINEERING, CHEMICAL
Evaluation
Fourier transforms
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
Natural Corrosion Inhibitor
SVET
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Summary:The inhibition effect of the cocoa bean shell powder (CBSP) on SAE 1008 carbon steel was studied in acidic medium (HCl 0.5 mol L-1) by electrochemical techniques and gravimetric measurements. Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) were used to the chemical and morphological characterization. The gravimetric and EIS results showed that the corrosion rate decreases with increasing inhibitor concentration, reaching the maximum value of 97.92% in 1.77 g L-1 inhibitor (highest concentration studied). Even at the lowest concentration (0.44 g L-1) good corrosion inhibition efficiency (96.03%) was observed. The polarization curves indicated that the CBSP acts as a mixed type inhibitor. The inhibitory molecules adsorption followed the Langmuir isotherm model. The inhibitor economic evaluation showed that the use of CBSP is 48-616 times cheaper than traditional inhibitors. The results showed that CBSP is an efficient corrosion inhibitor for carbon steel and its production is financially attractive.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-MR-2021-0125