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Lubricants
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Green Corrosion Inhibitors: Natural and Synthetic Organic Inhibitors
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Green Corrosion Inhibitors: Natural and Synthetic Organic Inhibitors

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: closed (15 September 2023) | Viewed by 25585

Special Issue Editors

Prof. Dr. Ahmed A. Al-Amiery

E-Mail Website
Guest Editor
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), P.O. Box: 43000, UKM Bangi, Selangor, Malaysia
Interests: natural and synthesized corrosion inhibtors
Dr. Wan Nor Roslam Wan Isahak

E-Mail Website
Guest Editor
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), P.O. Box: 43000, UKM Bangi, Selangor, Malaysia
Interests: catalysis; corrosion; CO2 capture and use; hydrogen production

Special Issue Information

Dear Colleagues,

Corrosion can be managed, athough it is inevitable. The degradation of metal caused by chemical reactions with its surroundings is known as corrosion. It is a persistent issue that is frequently challenging to fully resolve. Complete elimination would not be practicable or attainable, but prevention would. Corrosion inhibition is an issue that has been widely considered and investigated as it is one of the most beneficial methods of protecting metals with high performance and low-cost. There have been a number of studies, articles, and reports published about the organic inhibitors that contain heterocyclic double bonds and/or aromatic rings in their molecular structures. Green corrosion inhibitors are biodegradable and free of hazardous chemicals and heavy metals. Some research teams have reported using naturally occurring compounds to successfully stop metals from corroding in both acidic and basic solutions. This Special Issue intends to disseminate the most recent research on environmentally friendly corrosion inhibitors, both natural and synthetic, as well as the localised corrosion of engineering alloys in corrosive solutions.

Prof. Dr. Ahmed A. Al-Amiery
Dr. Wan Nor Roslam Wan Isahak
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Lubricants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metal corrosion
  • alloy corrosion
  • corrosion inhibitor
  • corrosive solutions

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Published Papers (4 papers)

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Research

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24 pages, 4323 KiB  
Article
Exploring the Effectiveness of Isatin–Schiff Base as an Environmentally Friendly Corrosion Inhibitor for Mild Steel in Hydrochloric Acid
by Ahmed A. Al-Amiery, Nadia Betti, Wan Nor Roslam Wan Isahak, Waleed Khalid Al-Azzawi and Wan Mohd Norsani Wan Nik
Lubricants 2023, 11(5), 211; https://doi.org/10.3390/lubricants11050211 - 8 May 2023
Cited by 27 | Viewed by 2544
Abstract
A recent study has shown that Schiff base OHMHI is an effective inhibitor of the corrosion of mild steel in acidic media. The study utilized weight loss measurements and electrochemical techniques, such as EIS and potentiodynamic polarization, to analyze the corrosion inhibition efficiency [...] Read more.
A recent study has shown that Schiff base OHMHI is an effective inhibitor of the corrosion of mild steel in acidic media. The study utilized weight loss measurements and electrochemical techniques, such as EIS and potentiodynamic polarization, to analyze the corrosion inhibition efficiency of OHMHI. The results of the study show that the presence of OHMHI in the corrosive environment significantly reduced the corrosion rate of mild steel and increased its corrosion resistance. The impedance spectra analysis indicated that OHMHI was adsorbed on the surface of mild steel, providing a protective layer. The potentiodynamic polarization study confirmed the protective role of OHMHI by showing an increase in the passive current density of the mild steel in the presence of OHMHI. The inhibitory efficiency of OHMHI was found to be 96.1%, indicating that it is an effective corrosion inhibitor for mild steel. The study also investigated the optimal conditions for the use of OHMHI as a corrosion inhibitor, with a concentration of 0.5 mM and a temperature of 303 K being chosen. The Langmuir adsorption isotherm concept was used to demonstrate the physical and chemical adsorption of OHMHI on the surface of mild steel. Morphological investigations of the uninhibited and inhibited surfaces of the mild steel specimen were examined using scanning electron microscopy (SEM) analysis. Furthermore, computational investigations using density functional theory (DFT) and experimental data were merged to explore the corrosion inhibition efficiency and mechanism of inhibition. Although the results are promising, further studies are needed to determine the long-term effects of OHMHI on mild steel corrosion and to evaluate its effectiveness under different environmental conditions. Overall, the study highlights the potential of OHMHI as an effective corrosion inhibitor for mild steel in acidic media. Full article
(This article belongs to the Special Issue Green Corrosion Inhibitors: Natural and Synthetic Organic Inhibitors)
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24 pages, 19658 KiB  
Article
Insights into the Corrosion Inhibition Performance of Three 2-Isoxazoline-γ-Lactones for Carbon Steel in Acidic Medium: Linking Molecular and Experimental-Level Information with Microscopic-Scale Modeling
by Youssef Youssefi, Abdeslam Ansari, Omar Ou-ani, Lahcen Oucheikh, Ahmad Oubair, Hassane Lgaz, Belkheir Hammouti, Abdelkarim Chaouiki, Young Gun Ko and Mohamed Znini
Lubricants 2023, 11(3), 141; https://doi.org/10.3390/lubricants11030141 - 16 Mar 2023
Cited by 9 | Viewed by 2069
Abstract
The corrosion inhibition properties of three spiro-isoxazoline derivatives, namely 3,4-diphenyl-1,7-dioxa-2-azaspiro[4.4]non-2-en-6-one (DDA), 3-phenyl-4-(p-tolyl)-1,7-dioxa-2-azaspiro[4.4]non-2-en-6-one (PDA) and 4-(4-methoxyphenyl)-3-phenyl-1,7-dioxa-2-azaspiro[4.4]non-2-en-6-one (MDA) on carbon steel in 1.0 mol/L HCl acid medium were experimentally and computationally investigated. The experimental results showed that the inhibitory efficiency reached remarkable values of 76.26, [...] Read more.
The corrosion inhibition properties of three spiro-isoxazoline derivatives, namely 3,4-diphenyl-1,7-dioxa-2-azaspiro[4.4]non-2-en-6-one (DDA), 3-phenyl-4-(p-tolyl)-1,7-dioxa-2-azaspiro[4.4]non-2-en-6-one (PDA) and 4-(4-methoxyphenyl)-3-phenyl-1,7-dioxa-2-azaspiro[4.4]non-2-en-6-one (MDA) on carbon steel in 1.0 mol/L HCl acid medium were experimentally and computationally investigated. The experimental results showed that the inhibitory efficiency reached remarkable values of 76.26, 80.31, and 82.91%, respectively, for DDA, PDA and MDA at a maximum concentration of 10−3 mol/L. The potentiodynamic polarization curves (PPCs) showed that investigated compounds had a mixed type character, controlling both anodic and cathodic corrosion reactions. In addition, electrochemical impedance spectroscopy (EIS) indicated that the addition of increasing concentration of tested compounds to HCl solutions led to a significant increase in the polarization resistance of the carbon steel, which was accompanied with a simultaneous decrease in the double layer capacitance. On the other hand, the morphological study of the metal surface by scanning electron microscope (SEM) and energy dispersive X-ray (EDX) confirmed the effective protection of the carbon steel by the inhibitors against corrosion through the formation of a protective film on its surface. The adsorption characteristics of investigated compounds on carbon steel were assessed at microscopic level using Density Functional Based Tight Binding (DFTB) simulation, which revealed the formation of covalent bonds between inhibitors’ atoms and Fe atoms. Furthermore, additional insights into the compounds’ reactivity and adsorption configurations on steel surface were obtained from global reactivity descriptors and Monte Carlo simulation. The present work’s outcomes are interesting for further design and performance evaluation of effective organic corrosion inhibitors for acid environments. Full article
(This article belongs to the Special Issue Green Corrosion Inhibitors: Natural and Synthetic Organic Inhibitors)
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16 pages, 2854 KiB  
Article
Thymus satureoides Oil as Green Corrosion Inhibitor for 316L Stainless Steel in 3% NaCl: Experimental and Theoretical Studies
by Florica Simescu-Lazar, Soukaina Slaoui, Mohamed Essahli, Frédéric Bohr, Abdeslam Lamiri, Laurent Vanoye and Jean Paul Chopart
Lubricants 2023, 11(2), 56; https://doi.org/10.3390/lubricants11020056 - 31 Jan 2023
Cited by 12 | Viewed by 2086
Abstract
The protection of 316L stainless steel in 3% NaCl by the essential oil of Thymus satureoides has been studied by many techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM) and scanning electron microscopy (SEM) coupled with energy dispersive [...] Read more.
The protection of 316L stainless steel in 3% NaCl by the essential oil of Thymus satureoides has been studied by many techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy analysis (EDXS). The results show that the corrosion rate of 316L stainless steel decreases with the increase in the concentration of the inhibitor up to an efficiency of 82% for a concentration of 1600 ppm. The Thymus satureoides oil acts as an anode inhibitor. The values of the inhibition effectiveness obtained from the polarization curves and electrochemical impedance spectroscopy (EIS) are in good agreement. Geometry optimization and calculation of the structural and electronic properties of the inhibitor molecular system have been carried out using density functional theory DFT (B3LYP, BMK and M062X) level with a 6-311++G** basis set. Full article
(This article belongs to the Special Issue Green Corrosion Inhibitors: Natural and Synthetic Organic Inhibitors)
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Review

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29 pages, 4767 KiB  
Review
Corrosion Inhibitors: Natural and Synthetic Organic Inhibitors
by Ahmed A. Al-Amiery, Wan Nor Roslam Wan Isahak and Waleed Khalid Al-Azzawi
Lubricants 2023, 11(4), 174; https://doi.org/10.3390/lubricants11040174 - 11 Apr 2023
Cited by 78 | Viewed by 18188
Abstract
Corrosion is a major challenge in various industries and can cause significant damage to metal structures. Organic corrosion inhibitors are compounds that are used to reduce or prevent corrosion by forming a protective film on metal surfaces. The present review article focuses on [...] Read more.
Corrosion is a major challenge in various industries and can cause significant damage to metal structures. Organic corrosion inhibitors are compounds that are used to reduce or prevent corrosion by forming a protective film on metal surfaces. The present review article focuses on natural and synthetic organic corrosion inhibitors and their classifications, active functional groups, and efficiency estimations. Furthermore, previous studies on the use of natural and synthetic organic inhibitors are discussed, along with adsorption isotherms and mechanisms of organic corrosion inhibitors. The kinetics of corrosion modeling are also discussed, providing insights into the effectiveness of organic inhibitors at reducing corrosion. This review aims to provide a comprehensive overview of the current knowledge on organic corrosion inhibitors, with the aim of promoting their wider use in corrosion protection. Full article
(This article belongs to the Special Issue Green Corrosion Inhibitors: Natural and Synthetic Organic Inhibitors)
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