Aerva lanata flowers extract as green corrosion inhibitor of low-carbon steel in HCl solution: an in vitro study
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ORIGINAL PAPER
Aerva lanata flowers extract as green corrosion inhibitor of low‑carbon steel in HCl solution: an in vitro study N. Rajesh Jesudoss Hynes1 · R. Meby Selvaraj2 · Tezeghdenti Mohamed3,4 · A. Murugananthan Mukesh1 · Kanoun Olfa5 · Maria P. Nikolova6 Received: 1 May 2020 / Accepted: 15 September 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract In this study, we present the performance as an inhibitor of plant extract of Aerva lanata flowers (ALF) used as an environmentally benign compound for protection of corrosion of low-carbon steel in 1.0 mol L −1 HCl solution. The investigation was accomplished using conventional mass loss, electrochemical measurements and scanning electron microscopy (SEM). The investigation of weight loss demonstrated that the inhibition performance had been improved via raising the concentration of the inhibitor. The efficiency of inhibition has been found to exceed 88% at 600 ppm of the ALF formulation. Using anodic polarization curves, it was demonstrated that flower extract of Aerva lanata acted as a mixed-type inhibitor. The green inhibitor compounds covered the steel surface following Langmuir adsorption isotherm. The surface morphology analysis was conducted to validate the results. Keywords Inhibition performance · Environmentally benign · Corrosion protection · Electrochemical technique · SEM
Introduction Iron and steels are utilized in a wide range of industries because of their natural availability, toughness, and economic viability. The main disadvantage of these materials * N. Rajesh Jesudoss Hynes [email protected] 1
Department of Mechanical Engineering, Mepco Schlenk Engineering College, Sivakasi, Tamilnadu 626005, India
2
Department of Mechanical Engineering, AAA College of Engineering and Technology, Sivakasi, Tamilnadu 626005, India
3
Research Laboratory of Environmental Sciences & Technologies, Higher Institute of Environmental Sciences and Technology, Carthage University, Hammam‑Lif 2050, Tunisia
4
Faculty of Mathematical, Physical and Natural Sciences of Tunis, University Tunis El Manar, Le Belvédère 1002 Tunis, Tunisie
5
Chair for Measurement and Sensor Technology, Technische Universitat Chemnitz, Reichenhainer Strasse 70, Chemnitz 09126, Germany
6
Department of Material Science and Technology, University of Ruse “Angel Kanchev”, 8 Studentska Str, Ruse 7017, Bulgaria
is the high level of susceptibility to corrosion in acid environments. In fact, strong mineral acids like hydrochloric acid are frequently used as efficient pickling agents in chemical and steel industry in particular for the removal of scale, rust, cleaning, etc. Due to their low corrosion resistance, steels are subject to serious corrosion within these aggressive solutions (Derfouf et al. 2019). In many instances, during acid cleaning of steel surfaces by hydrochloric acid (HCl) before painting or storage, the reaction between acid solutions and iron or its oxides is fierce after several working cycles. The aggressive C l− and H
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