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

Abstract

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.

Examining the ability of palm kernel shell extract to control corrosion and assess its economic value on thermo-mechanically treated steel in artificial seawater: a sustainable and environmentally friendly approach

“…The direct cost of producing 1,000 g of the corrosion inhibitor under study in a laboratory setting was assessed. As a result, the energy costs associated with milling, drying, and screening as well as the transportation costs of the residue removal at the facility was taken into account ( Carvalho et al, 2022 ), $ 0.09 was used. The average market value of commercial inhibitors was given in the work of ( Carvalho et al, 2022 ) and these data are displayed in Table 2 .…”

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

“…The methodology used is the standard used in the area of corrosion of materials. Some authors who studied some residues as a natural corrosion inhibitor used this same methodology, such as Santos et al (2021) in their study on Palmiste pie powder as a natural corrosion inhibitor; and Carvalho et al (2022) in their study of cocoa bean husk as a natural corrosion inhibitor. For a better understanding of the research, the experimental part is divided into preparation of the residue that will be tested as an inhibitor, preparation of the metal that will be used as a substrate, the characteristic tests of the corrosion area (electrochemical and gravimetric) and finally a characterization through Scanning Electron Microscopy and Energy Dispersive X-Ray Spectroscopy.…”

“…Shalabi and Nazeer (2015) in the evaluation of the extract of different parts of the species Schinus terebinthifolius cultivated in Egypt as an inhibitor of corrosion of carbon steel, indicated a mixed performance of the mentioned inhibitor. Carvalho et al (2022) detected mixed behavior in their evaluation of cocoa bean husk powder as an inhibitor of corrosion of carbon steel in acidic medium. Source: Authors.…”

Cocoa Bean Shell: A By-Product with High Potential for Nutritional and Biotechnological Applications

“…In addition, the authors reported that for all of the concentrations tested, CBS powder did not show efficient corrosion, while hydroalcoholic extract presented a good performance at the lowest concentration (0.4 g/L). The same authors [136] evaluated the corrosion-inhibitory properties of CBS powder with the same steel but, in this case, in an acidic medium (HCl 0.5 mol/L). An excellent corrosion inhibition efficiency (96%) was achieved at the lowest concentration of inhibitor tested (0.4 g/L), revealing the potential of CBS as an efficient corrosion inhibitor for carbon steel.…”