Abstract
Metallic corrosion can be delayed using corrosion inhibitors. However, several industrial corrosion inhibitors are toxic and harmful to the environment and to the human health. In this context, in the last decades, research has been developed to investigate the performance of low toxicity corrosion inhibitors as green inhibitors obtained from vegetables, which are environmentally acceptable. The present work studied the corrosion inhibition efficiency of peel garlic extract (Allium sativum. L.) for possible replacement of benzotriazole (BTAH) on the corrosion inhibition of ASTM 1020 carbon steel (CS-1020) in 0.5 mol.L-1 hydrochloric acid media. Weight loss measurements, anodic and cathodic potentiodynamic curves and electrochemical impedance (EIS) experiments were carried out. The Fourier transformed infrared spectroscopy (FTIR) was carried out to evaluate the chemical compounds. The morphological characterization was obtained to observe the inhibitor effect in the corrosion products on substrate surface. The results showed that the addition of both inhibitors effectively hinder the corrosion process and indicated their adsorption on the electrode surface. The inhibiting efficiency of the peel garlic extract was only slightly inferior to BTAH showing that the former inhibitor can be an environmentally friendly option to toxic inhibitors. The FTIR analysis showed the presence of chemical compounds which presents antioxidant properties.
Highlights
Corrosion is a phenomenon resulting in materials deterioration through chemical or electrochemical interaction with the environment
Considering the interest of preserving carbon steel structures and to obtain a low toxicity inhibitor, this study aims to evaluate the behavior of a natural corrosion inhibitor obtained from garlic peel (Allium sativum L.) for a possible replacement of benzotriazole (BTAH) on the corrosion protection of 1020 carbon steel (CS-1020) in acidic medium (0.5 mol.L-1 HCl)
3.1 Fourier transformed infrared spectroscopy (FTIR) Characterization Figures 1 and 2 show, respectively, the FTIR spectra acquired from the peel garlic extract and benzotriazole (BTAH) powder
Summary
Corrosion is a phenomenon resulting in materials deterioration through chemical or electrochemical interaction with the environment. This process may compromise the mechanical and physical properties of equipments with serious economic and environmental impact in all infrastructure sectors, such as roads, oil and gas pipelines, construction and water and sewage systems, causing severe damage and threats to public safety and health [1]. Due to its mechanical properties and low cost, is widely used in industry. This material has low corrosion resistance, reducing the performance and useful life of engineering products. They get adsorbed on the metal surface by displacing water molecules [4] and the bonding efficiency is enhanced by the presence of polar functions with S, O or N atoms in the molecule, heterocyclic compounds and π electrons [5]
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