Green Corrosion Inhibitors for Metallic Materials

Topic Information

Dear Colleagues,

For many years there has been an active effort to find new environmentally friendly and safe inhibitors for a range of applications. Much of this work has been driven by chromate replacement, but increasingly this has broadened to include drivers based more on sustainable inhibitor systems. This means that there is not only a drive to replace chromate in applications where it is used, but also to look for more environmentally friendly inhibitors in non-chromate applications. This broadened scope may include the replacement of chemicals that have a large environmental impact upstream, for example, during their extraction and manufacture, or chemicals that are expensive with chemicals that have a smaller footprint. As an example, there has been an enormous amount of work looking for organic inhibitors which can be either individual organic chemicals or plant extracts that contain a combination of organic chemicals. Moreover, the search for alternatives is moving towards the investigation of inhibitor combinations for synergies in behaviour. Synergies may be based on having components that, for example, are effective in different pH ranges, may be anion–cation combinations or may operate in different chemical environments.

This Topic has a focus on these new inorganic or organic green inhibitor systems. The Topic Editors are inviting contributions based on new green inhibitors, particularly for inhibition in aqueous systems, including original research papers as well as short review papers on specific areas.

Dr. Anthony Hughes
Dr. Anthony Somers
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Coatings coatings	3.4	4.7	2011	13.8 Days	CHF 2600
Materials materials	3.4	5.2	2008	13.9 Days	CHF 2600
Molecules molecules	4.6	6.7	1996	14.6 Days	CHF 2700
Polymers polymers	5.0	6.6	2009	13.7 Days	CHF 2700
Metals metals	2.9	4.4	2011	15 Days	CHF 2600

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Published Papers (4 papers)

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24 pages, 6711 KiB  

Open AccessArticle

Corrosion Inhibition of Expired Cefazolin Drug on Copper Metal in Dilute Hydrochloric Acid Solution: Practical and Theoretical Approaches

by Raiedhah A. Alsaiari, Medhat M. Kamel and Mervate M. Mohamed

Molecules 2024, 29(5), 1157; https://doi.org/10.3390/molecules29051157 - 05 Mar 2024

Viewed by 646

Abstract

In this work, we studied the corrosion of Cu metal in 0.5 mol L⁻¹ HCl and the inhibition effect of the expired Cefazolin drug. The inhibition efficiency (IE) of Cefazolin varied according to its concentration in solution. As the Cefazolin concentration increased [...] Read more.

In this work, we studied the corrosion of Cu metal in 0.5 mol L⁻¹ HCl and the inhibition effect of the expired Cefazolin drug. The inhibition efficiency (IE) of Cefazolin varied according to its concentration in solution. As the Cefazolin concentration increased to 300 ppm, the IE increased to 87% at 298 K and decreased to 78% as the temperature increased to 318 K. The expired drug functioned as a mixed–type inhibitor. The adsorption of the drug on the copper surface followed Temkin’s adsorption model. The magnitudes of the standard free energy change (ΔG^o_ads) and adsorption equilibrium constant (K_ads) indicated the spontaneous nature and exothermicity of the adsorption process. Energy dispersive X-ray (EDX) and scanning electron microscopy (SEM) techniques showed that the drug molecules were strongly attached to the Cu surface. The electrochemical frequency modulation (EFM), potentiodynamic polarization (PP), and electrochemical impedance spectroscopy (EIS) results were in good agreement with the results of the weight loss (WL) method. The density functional tight–binding (DFTB) and Monte Carlo (MC) simulation results indicated that the expired drug bound to the copper surface through the lone pair of electrons of the heteroatoms as well as the π-electrons of the tetrazole ring. The adsorption energy between the drug and copper metal was –459.38 kJ mol⁻¹. Full article

(This article belongs to the Topic Green Corrosion Inhibitors for Metallic Materials)

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29 pages, 6090 KiB  

Open AccessArticle

Electrochemical and Surface Characterisation of Carbon Steel Exposed to Mixed Ce and Iodide Electrolytes

by Mohammed A. El-Hashemy, Christopher D. Easton, Aaron Seeber, Ivan S. Cole and Anthony E. Hughes

Metals 2023, 13(9), 1553; https://doi.org/10.3390/met13091553 - 03 Sep 2023

Viewed by 853

Abstract

The protection of ferrous metals in acidic environments is important in many industries. Extending the pH range of organic inhibitors to low pH has been achieved with the addition of iodide ions, which facilitate adsorption. It was of interest to see whether similar [...] Read more.

The protection of ferrous metals in acidic environments is important in many industries. Extending the pH range of organic inhibitors to low pH has been achieved with the addition of iodide ions, which facilitate adsorption. It was of interest to see whether similar outcomes could be achieved with inorganic inhibitors. To this end, this paper examines the influence of potassium iodide addition on the level of corrosion protection provided by Ce(NO₃)₃ in 3.5% NaCl electrolytes over a pH range of 2.5 to 8. Potentiodynamic polarization was used to assess percentage inhibitor efficiency (IE%), and scanning electron microscopy, energy dispersive X-ray spectrometry, and X-ray photoelectron spectroscopy were used to characterize the corrosion product. It was found that KI alone provided only poor corrosion inhibition except at pH 2.5, where nearly 85IE% was achieved. Its addition to the cerium electrolytes was generally in excess of 90% and over 97% for the optimum concentration. The addition of KI seemed to change the mechanism of formation of corrosion products from predominantly Fe₂O₃ to a mixture of FeOOH, Fe₃O₄, and Fe₂O₃, which were more adherent. Corrosion protection was extended to pH 4, but under the conditions explored here, no additional protection was evident at pH 2.5. Full article

(This article belongs to the Topic Green Corrosion Inhibitors for Metallic Materials)

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23 pages, 6129 KiB  

Open AccessArticle

Insights into the Corrosion Inhibition Performance of Isonicotinohydrazide Derivatives for N80 Steel in 15% HCl Medium: An Experimental and Molecular Level Characterization

by Abdelkarim Ait Mansour, Badr El-Haitout, Raihana Jannat Adnin, Hassane Lgaz, Rachid Salghi, Han-seung Lee, Mustafa R. Alhadeethi, Mouslim Messali, Khadija Haboubi and Ismat H. Ali

Metals 2023, 13(4), 797; https://doi.org/10.3390/met13040797 - 18 Apr 2023

Cited by 10 | Viewed by 1337

Abstract

In this work, two compounds of isonicotinohydrazide organic class, namely (E)-N′-(1-(4-(dimethylamino)phenyl)ethylidene) isonicotinohydrazide (MAPEI) and (Z)-N′-(2-oxo-2, 3-dihydro-1H-inden-1-ylidene) isonicotinohydrazide (OHEI) were synthesized and evaluated for corrosion protection of N80 steel in a concentrated acidic medium (15 wt.% HCl) at a temperature [...] Read more.

In this work, two compounds of isonicotinohydrazide organic class, namely (E)-N′-(1-(4-(dimethylamino)phenyl)ethylidene) isonicotinohydrazide (MAPEI) and (Z)-N′-(2-oxo-2, 3-dihydro-1H-inden-1-ylidene) isonicotinohydrazide (OHEI) were synthesized and evaluated for corrosion protection of N80 steel in a concentrated acidic medium (15 wt.% HCl) at a temperature of 303 K. The weight loss method (gravimetric method) and electrochemical techniques, i.e., electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves (PPC), were used to evaluate the inhibition and adsorption characteristics of tested compounds. Further, surface characterization using a scanning electron microscope (SEM) was used to assess the surface morphology of steel before and after inhibition. Weight loss experiments at 303 K and 363 K showed that tested compounds’ performance decreased with the increase in temperature, particularly at low concentrations of inhibitors whereas they exhibited good stability at higher concentrations. Electrochemical tests showed that MAPEI and OHEI inhibitors were effective at 5 × 10⁻³ mol/L, reaching an inhibition efficiency above 90%. It was also determined that the adsorption of both inhibitors followed the Langmuir adsorption isotherm model. Furthermore, SEM analysis showed that the investigated compounds can form a protective layer against steel corrosion in an acidic environment. On the other hand, the corrosion inhibition mechanism was established from density functional theory (DFT), and the self-consistent-charge density-functional tight-binding (SCC-DFTB) method which revealed that both inhibitors exerted physicochemical interactions by charge transfer between the s- and p-orbitals of tested molecules and the d-orbital of iron. The results of this work are intended to deepen the research on the products of this family to control the problem of corrosion. Full article

(This article belongs to the Topic Green Corrosion Inhibitors for Metallic Materials)
(This article belongs to the Section Corrosion and Protection)

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21 pages, 7954 KiB  

Open AccessArticle

Evaluation of Tannins as Potential Green Corrosion Inhibitors of Aluminium Alloy Used in Aeronautical Industry

by Carla Sofia Proença, Bruno Serrano, Jorge Correia and Maria Eduarda Machado Araújo

Metals 2022, 12(3), 508; https://doi.org/10.3390/met12030508 - 16 Mar 2022

Cited by 13 | Viewed by 3254

Abstract

In this work some organic natural products were studied, namely tannic acid, gallic acid, mimosa tannin and chestnut tannin, as potential green corrosion inhibitors of the aluminium alloy AA2024-T3. The anodizing treatment was performed in a solution of the referred organic compounds in [...] Read more.

In this work some organic natural products were studied, namely tannic acid, gallic acid, mimosa tannin and chestnut tannin, as potential green corrosion inhibitors of the aluminium alloy AA2024-T3. The anodizing treatment was performed in a solution of the referred organic compounds in diluted sulfuric acid. The electrochemical impedance spectroscopy and the potentiodynamic polarization were performed to assess sealing quality and corrosion protection granted by the anodic films. To understand the green inhibitors; interaction with the metal surface, FTIR spectra of anodizing and anodizing and sealed samples of AA2023-T3 were recorded, and the shifts in the position of the major bands confirmed that the green inhibitor interacts with the metal surface. Images of the morphology of the coatings were provided by Scanning Electron Microscopy. From the results obtained through the various techniques that were used to carry out this study it is possible to conclude that the formed anodic films can be a good contribution for the prevention of corrosion in the aluminium alloy AA2024-T3. Full article

(This article belongs to the Topic Green Corrosion Inhibitors for Metallic Materials)
(This article belongs to the Section Corrosion and Protection)

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