Evaluation of Palm Kernel Cake Powder (Elaeis guineensis Jacq.) as Corrosion Inhibitor for Carbon Steel in Acidic Media

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2021-06-05
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SANTOS, A. M.
Isabella Aquino
COTTING, F.
AOKI, V.
DE MELO, H. G.
CAPELOSSI, V. R.
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Metals and Materials International
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SANTOS, A. M.; AQUINO J. I.; COTTING, F.; AOKI, V.; DE MELO, H. G.; CAPELOSSI, V. R. Evaluation of Palm Kernel Cake Powder (Elaeis guineensis Jacq.) as Corrosion Inhibitor for Carbon Steel in Acidic Media. Metals and Materials International, v. 27, n. 6, p. 1519-1530, jun. 2021.
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© 2020, The Korean Institute of Metals and Materials.Abstract: This work aims to investigate the possible use of the palm kernel cake powder (Elaeis guineensis Jacq.) as corrosion inhibitor for ASTM 1020 carbon steel in acidic media (0.5 mol L−1 HCl). The investigation was carried out using electrochemical impedance spectroscopy (EIS), polarization curves, gravimetric technique and scanning vibrating electrode technique (SVET). Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were employed as chemical and surface characterization techniques, respectively. The results of the EIS and gravimetric tests showed that the substance acts as an effective corrosion inhibitor and inhibition efficiency (IE) increases according with the increase of the corrosion inhibitor concentration in the aggressive medium. The highest IE of 87% was obtained for the highest corrosion inhibitor concentration used (1.77 g/L). The polarization curves revealed a mixed inhibitor. The adsorption of the studied inhibitor on carbon steel surface obeyed Langmuir isotherm. The SVET measurements did not reveal anodic or cathodic activities in the substrate surface in the presence of the inhibitor, revealing that the corrosion inhibitor was able to block both reactions. FTIR analyses identified in the powder the presence of hydroxyl group, aromatic rings, nitrogen and oxygen in such groups as amines and oleaginous acid, which can be responsible for the inhibitory properties of the whole material. SEM analyses showed that the corrosion process was retarded when the inhibitor was added to electrolyte. The results indicate that the powder of palm kernel cake is promising for use as corrosion inhibition purpose for carbon steel in acidic media. Graphic Abstract: [Figure not available: see fulltext.]

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