Abstract
Corrosion represents high losses to the economy, therefore, researches on the minimization of its damages in materials, mainly the metallic ones, are necessary. Among the various alternatives of protection against corrosion, there is the application of corrosion inhibitors that can minimize or even stop the corrosive process of metallic materials. However, at present, substances usually used as corrosion inhibitors present high toxicity, being considered harmful components to the environment and to human health. Therefore, there is an urgent need for studies on viable corrosion inhibitors, by considering not only economic but also environmental costs. The present work studied the use of cocoa bark extract (Theobrama cacao L), for possible replacement of benzotriazole (BTAH) in the corrosion inhibition of ASTM 1020 carbon steel (CS- ASTM 1020) in 18.23 g.L-1 hydrochloric acid media. Weight loss measurements, anodic and cathodic potentiodynamic polarization curves and electrochemical impedance experiments were carried out. The results showed that the addition of the extract to the electrolyte effectively hinder the corrosion process and indicated its adsorption on the electrode surface. In addition, the inhibiting efficiency of the cocoa bark extract was only slightly inferior to BTAH, showing that it can be an environmentally friendly option to toxic inhibitors.
Highlights
Acidic solutions are widely used in several industries, mainly in acid pickling, oil wells, cleaning and decalcification, leading to corrosive attack of metals
BTAH is widely used as corrosion inhibitor due to its ability to form a protective film on different metallic materials and the literature demonstrates that it can effectively hinder steel corrosion in several media[9,10,11]
Considering the interest to preserve carbon steel and to obtain low-toxicity inhibitors from vegetables residues, this study is focused on the assessment of the corrosion inhibition potentiality of a natural corrosion inhibitor obtained from the residues of Theobroma cacao processing, the cocoa bark extract, for the replacement of benzotriazole (BTAH) to protect 1020 carbon steel corrosion in HCl
Summary
Acidic solutions are widely used in several industries, mainly in acid pickling, oil wells, cleaning and decalcification, leading to corrosive attack of metals. One of the most widespread and inexpensive ways to control metallic corrosion in such applications is by using corrosion inhibitors Compounds such as chromates, phosphates and benzotriazole (BTAH) have being efficiently employed to mitigate corrosion damage in acidic media[1,2,3]. Considering the interest to preserve carbon steel and to obtain low-toxicity inhibitors from vegetables residues, this study is focused on the assessment of the corrosion inhibition potentiality of a natural corrosion inhibitor obtained from the residues of Theobroma cacao processing, the cocoa bark extract, for the replacement of benzotriazole (BTAH) to protect 1020 carbon steel corrosion in HCl. It is important to emphasize that, to the authors' knowledge, there is no report in the literature about the effectiveness of cocoa residues as corrosion inhibitor for metals in acidic media. The only report found on similar subject was about positive inhibitory efficacy of polyphenol groups extracted from cocoa liquor towards tin corrosion in food media, which was published in a conference paper[22]
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