Heteroatom-Based Compounds as Sustainable Corrosion Inhibitors: An Overview
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Heteroatom‑Based Compounds as Sustainable Corrosion Inhibitors: An Overview Dakeshwar Kumar Verma1 · Yeestdev Dewangan1 · Amit Kumar Dewangan1 · Ashish Asatker2 Received: 9 July 2020 / Revised: 9 July 2020 / Accepted: 10 November 2020 © Springer Nature Switzerland AG 2020
Abstract Heteroatoms (such as phosphorous, sulphur, oxygen and nitrogen) containing organic molecules exhibit remarkable efficiency towards corrosion inhibition. Their efficiency is attributed to the presence of lone pair of electrons and pi electrons in the molecule, due to which they are easily deposited on the metal surface. However, the organic compounds containing less electronegative heteroatoms generally show higher inhibition efficiency (IE) due to the facile migration of lone pair of electrons. Acidic solutions are widely used as electrolyte medium. The value of ∆G (Gibbs adsorption energy) reveals the nature of the inhibitors adsorb to the metal surface. Gravimetric and electrochemical analyses are extensively applied for the determination of corrosion inhibition. Similarly, surface analysis and theoretical investigation are also applied for supportive evidences. The purpose of the present review is to highlight the heteroatom-based potential corrosion inhibitors. Keywords Heteroatoms · Acidic solution · Corrosion inhibition · Adsorption · Surface chemistry · Electrochemistry Abbreviations WL Weight loss EIS Electrochemical impedance spectroscopy PDP Potentiodynamic polarization OCP Open circuit potential SEM Scanning electron microscopy EDS Electron dispersion x-ray spectroscopy QCC Quantum chemical calculation DFT Density function theory, XPES X-ray photoelectron spectroscopy MDS Molecular dynamic simulation XRD X-ray diffraction FTIR Fourier transform infrared AFM Atomic force microscopy EDXA Energy dispersive x-ray analysis GCMS Gas chromatography mass spectrophotometer HE Hydrogen evolution CTAB Cetyl Trimethyl Ammonium Bromide
* Dakeshwar Kumar Verma [email protected] 1
Department of Chemistry, Govt. Digvijay Autonomous Postgraduate College, Rajnandgaon, Chhattisgarh 491441, India
Department of Chemistry, Govt. Gundadhur Postgraduate College, Kondagaon, Chhattisgarh, India
2
1 Introduction Corrosion arises as an electrochemical process due to a potential difference on the metal surface. Various cleaning processes like acid cleaning, scraping, oil-well cleaning and acid pickling processes require aggressive and corrosive media which causes damage on metallic surface [1–3]. To prevent the metallic loss, use of corrosion inhibitor is essential. NACE reported that the worldwide loss due to the corrosion is approximately 2.7 trillion dollars per year which is about 4.3% of total GDP (gross domestic product [4, 5]. The efficiency of any organic compound depends on its adsorption property onto the surface of metal. Heteroatoms (S, P, O, N) containing molecules have lone pair electrons that facilitate the deposition of molecules onto the metal surface having empty d orbitals. In this way, these organi
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