Application of Essential Oils as Green Corrosion Inhibitors
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REVIEW ARTICLE – CHEMICAL ENGINEERING
Application of Essential Oils as Green Corrosion Inhibitors S. M. Z. Hossain1 · S. A. Razzak2 · M. M. Hossain2 Received: 25 April 2019 / Accepted: 23 December 2019 © King Fahd University of Petroleum & Minerals 2020
Abstract This review reports the application of essential oils (EOs) as a green corrosion/biocorrosion inhibitor. The topics discussed are: (i) sources and composition of EOs, (ii) adsorption mechanism, (iii) anticorrosion effects of EOs on metal surfaces, (iv) electrochemical investigations, (v) antimicrobial activity of EOs on corrosion-producing bacteria and algae, (vi) synergetic effects of EOs, and (vii) economical aspect and application of inhibitors. Various aspects of biofilms are discussed to identify microbiologically influenced corrosion (MIC) and the characterization of microorganisms causing MIC. The studies indicate that EOs have the potential as eco-friendly corrosion inhibitors in both aggressive chemicals and biofilm environments. Keywords Essential oil · Corrosion · Microbiologically influenced corrosion · Metabolomics · Solid-phase microextraction Abbreviations EOs Essential oils PDP Potentiodynamic polarization EIS Electrochemical impedance spectroscopy Rct Charge-transfer resistance Rs Solution resistance Cdl Double-layer capacitance MIC Microbial-induced corrosion EPS Extracellular polymer agent SPME Solid-phase microextraction HS-SPME Head space solid-phase microextraction GC Gas chromatography GC–MS Gas chromatography–mass spectroscopy SPME/GC–MS Solid-phase microextraction/gas chromatography–mass spectroscopy [Fe2+] Concentration of iron ion NMR Nuclear magnetic resonance spectroscopy LC Liquid chromatography SEM Scanning electron microscopy * M. M. Hossain [email protected] 1
Department of Chemical Engineering, University of Bahrain, Zallaq 32038, Kingdom of Bahrain
Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
2
XRD X-ray diffraction TOF-MS Time-of-flight mass spectrometry LC–MS Liquid chromatography–mass spectroscopy PDMS Polydimethylsiloxane PA Polyacrylate PDMS/DVB Polydimethylsiloxane/divinylbenzene CW/PEG Carbowax/polyethylene glycol CW/TPR Carbowax/templated resin CAR/PDMS Carboxen/polydimethylsiloxane DVB/CAR/PDMS Divinylbenzene/carboxen/ polydimethylsiloxane
1 Introduction Corrosion is a common problem associated with metalbased applications. Corrosion of metal/metal alloy surfaces is due to the formation of metal compounds induced by the development of anodic and cathodic areas on the metal/ alloy surfaces. Metal surfaces are prone to corrosion when exposed to corrodents or corrosion-causing agents. Some of the commonly used chemicals, materials, or conditions that can act as corrodents include soot, chloride ions, sulfate salts, acidic/alkaline materials, dissolved gases, bacteria, humidity, salinity, temperature, and mechanical stresses. The corrosion of metals (due to chemical attack or biofilm formation) has a signif
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