A Green Approach: Evaluation of Combretum indicum (CI) Leaf Extract as an Eco-friendly Corrosion Inhibitor for Mild Stee
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ORIGINAL ARTICLE
A Green Approach: Evaluation of Combretum indicum (CI) Leaf Extract as an Eco‑friendly Corrosion Inhibitor for Mild Steel in 1M HCl Pavithra S. Neriyana1,2 · Vijaya D . P. Alva1,2 Received: 27 July 2020 / Accepted: 30 September 2020 © The Tunisian Chemical Society and Springer Nature Switzerland AG 2020
Abstract The anticorrosive activity of Combretum indicum (CI) leaf extract has been examined on mild steel corrosion in 1M HCl by using weight loss and electrochemical measurement techniques. The results of these experimental techniques have consistent in confirming the effect of the CI leaf extract on corrosion inhibition and a mechanism for the inhibition was proposed. The dissolution rate of steel in acidic solution was found to be sensitive to the concentration of CI leaf extract and the corrosion rate reduces when the concentration of CI leaf extract is increased and reaches the high protection efficiency. The potentiodynamic polarization study confirms the mixed mode of inhibition. Ultraviolet–visible (UV) and Fourier -transform infrared (FTIR) spectroscopic techniques were performed to evaluate the phenomenon of adsorption in the plant extract and the functional groups. The surface morphology analysis (SEM) further corroborates the adsorption of inhibitor molecules over the metal surface. Keywords Corrosion · Inhibition · Mild steel · CI leaf extract
1 Introduction Mild steel is one of the most commonly used metal in residential and commercial structures, due to its excellent tensile strength, durability, and low cost. But it has poor resistance to corrosion in acidic environments. Acids are generally used in several industries for the removal of scale and rust. Hydrochloric acid is one of the most aggressive acids which is widely used in industries for pickling processes. Chemically active metals and alloys are affected by the corrosion due to the exposure of metals to the acidic solution. Corrosion is the destruction of a metallic surface due to its interaction with the environment and it can be lowered by using suitable preventive measures. Corrosion inhibition is one of the most practical and convenient techniques to prevent corrosion on metals in an acidic environment. Corrosion inhibitors control the metallic dissolution and acid consumption, by forming a protective layer on the metal surface. A variety * Vijaya D . P. Alva [email protected] 1
Department of Chemistry, Shree Devi Institute of Technology, Kenjar, Mangalore, Karnataka 574142, India
Affiliated to Visvesvaraya Technological University, Belagavi, Karnataka, India
2
of organic compounds were studied as corrosion inhibitors. Literature reveals that organic inhibitors containing heteroatoms such as nitrogen, sulfur, phosphorous, and oxygen with aromatic rings in their structures are excellent inhibitors. But unfortunately, they have high manufacturing costs and toxicity on the environment. Therefore, natural products have been used as environmentally acceptable, readily available, and low-cost inhibitors. Plant
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