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Equivalent circuit used to fit the experimental data for (a) blank and (b) CHT-CuO nanocomposite and in combination with KI as well as representative of the fitted impedance for (c) blank and (d) 0.5% CHT 0.5 -CuO nanocomposite.
Source publication
Chitosan–copper oxide (CHT–CuO) nanocomposite was made by an in-situ method utilizing olive leaf extract (OLE) as reductant. The OLE mediated CHT–CuO nanocomposite containing varying amount of chitosan (0.5, 1.0 and 2.0 g) was evaluated as corrosion inhibitor for X60 carbon steel in 5 wt% hydrochloric acid solution. The corrosion inhibitive perform...
Contexts in source publication
Context 1
... is also ascribed to active site dispersion, inhibitor molecule adsorption, and the creation of porous layers [42,43]. Figure 4c,d depict representative simulated and empirically obtained impedance plots for X60 carbon steel in 5% hydrochloric acid without and with nanocomposite additive, respectively. For all experimental data, this model provided an excellent fit. ...
Context 2
... all experimental data, this model provided an excellent fit. It is obvious from the figure that the measured impedance plot matches the one simulated by the equivalent circuits given in Figure 4a,b, respectively. The solution and charge transfer resistances are represented in the equivalent circuits by R s and R ct , respectively, R f stands for film resistance. ...
Context 3
... diameter of capacitive loops in the presence of nanocomposites + KI is larger than that of KI and nanocomposites alone (Figure 7), signifying a higher R ct at the metal-electrolyte interface [51]. Displayed in Table 4 are the electrochemical parameters that were derived utilizing the equivalent circuit depicted in Figure 4b to fit the experimental data for the nanocomposites + KI mixtures. Table 4 shows that the R ct is higher in the presence of nanocomposites alone than in the lack of nanocomposites, and even higher in the presence of nanocomposites in conjunction with KI. ...
Citations
... However, some of the corrosion inhibitors reported in literature are highly toxic, expensive and scarce, therefore, stimulating research for new corrosion inhibitors (and also improving on other reported inhibitors) with excellent performance, no or negligible toxicity, low cost and ease of adoption for industrial application. The corrosion inhibitory effect of plant extracts (Hamdouch et al. (2023), (Eziuka et al. (2023), (Ezeamaku et al. (2023), (Haque et al. (2023), (Ikhmal et al. (2019), (Ezeh & Chinedu (2023), (Fouda et al. (2020), (Haque et al. (2021), (Alimohammadi et al. (2023), (Azzaoui et al. (2017), (Ghahremani et al. (2021), nanomaterials (Aslam et al. (2022), (Quadri et al. (2017), (Surendhiran et al. (2021), (Umoren et al. (2022), (Nwanonenyi et al. (2021), amino acids (Sedik et al. (2022), (Kasprzhitskii et al. (2021), (Hamadi et al. (2018), pyrazoline derivatives (Lgaz et al. (2018), coumarin derivatives (Zinad et al. (2020), surfactants (Khowdiary et al. (2022) and several other inhibitors have been reported. Some of the synthetic inorganic compounds used as inhibitors are toxic and difficult to synthesize. ...
Ficus sur-mediated synthesized ZnO nanoparticles (ZnONps) and
synthesized ZnO/arginine/tyrosine nanocomposite (ZAT) were characterized
using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy,
scanning electron microscopy (SEM), Energy dispersive X-ray (EDX)
spectroscopy, X-ray fluorescence (XRF), Dynamic light scattering (DLS) and
Brunauer-Emmett-Teller (BET) analysis. Corrosion inhibition efficacy of
ZnONps and ZAT in 1 M HCl was studied using potentiodynamic polarization
(PDP), electrochemical impedance spectroscopy (EIS), gravimetric analysis and
atomic absorption spectroscopy (AAS). XRD analysis revealed that ZnONps and
ZAT are crystalline with average crystallite size equal to 28.57 nm and 32.65 nm
respectively. The hydrodynamic size for ZnONps and ZAT were found to be 34.99
d.nm and 36.57 d.nm respectively from DLS analysis. XRF confirmed ZnONps
synthesis and corroborated XRD, FTIR and EDX results. PDP analysis revealed
that ZnONps and ZAT showed mixed-type inhibitor propensity. Corrosion current
densities (Icorr) decreased in the presence of ZnONps and ZAT resulting to
inhibition efficiency of 92.4 % and 98.5 % respectively in the presence of 1000
ppm of each inhibitor. Charge transfer resistance values decreased in the presence
of inhibitors which suggests formation of protective film on mild steel surface.
Electrochemical analysis results are in agreement with gravimetric and AAS
analysis findings.
Keywords: Corrosion inhibition, synthesis, Nanoparticles, inhibition efficiency, Ficus sur
... Among the transition metal oxide nanoparticles, copper oxide (CuO) has proven to be a versatile material with applications in different fields (Zhang et al. 2014). Recently, chitosansupported CuO composites have received significant attention for their applications as catalysts (Aljuhani et al. 2021), supercapacitors (Xi et al. 2023), antibacterial agents (Govindasamy et al. 2022), corrosion inhibitors (Umoren et al. 2022), adsorbents (Xu et al. 2022), sensors (Ali et al. 2020), etc. ...
The synthesis of 1,4-disubstituted 1,2,3-triazoles through copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction has gained much attention due to its versatility and broad range of applications. In this study, we report two novel heterogeneous copper catalysts based on dehydroacetic acid chitosan Schiff base (DCSB) for the CuAAC reaction in water. The DCSB was synthesized through the condensation reaction of dehydroacetic acid and chitosan, and was subsequently used to support Cu(II) ions and CuO nanoparticles (CuO NPs). The prepared compounds were characterized using FT-IR, XRD, FE-SEM, EDX, BET, and TGA analyses. The performance of the catalysts was evaluated in a model reaction involving the 1,3-dipolar cycloaddition reaction of benzyl chloride, phenylacetylene, and sodium azide for the synthesis of 1,2,3-triazoles. After optimizing the reaction conditions, the scope of the reaction was extended to various substituted benzyl chlorides and alkyne molecules. Moreover, the recyclability of the catalysts was studied for up to four cycles.
... Metals frequently dissolve more quickly when they come into contact with a hostile environment. This irreversible degradation drastically reduces the useful life of metallic materials, affecting home and industrial properties [1,2]. The World Corrosion Organization's most recent survey estimates that the global direct cost of corrosion is between €1.3 and €1.4 trillion, or 3.1 to 3.5% of a country's GDP, excluding the harm that corrosion causes to the environment, the waste of resources, the loss in production, or personal injury [3]. ...
Abstract: The high cost of production and potentially harmful effects of inorganic corrosion inhibitors
on the ecosystem necessitated the search for a low-cost, efficient, and environmentally friendly
alternative. Due to their high surface-to-volume ratio and capacity to create self-assembled films on
metal surfaces, benign nanoparticles present a good alternative. In this study, Eastern Nigerian propolis
extracts were utilized to synthesize silver nanoparticles and were characterized spectroscopically. The
composites were then tested for corrosion-inhibitive potentials in HCl solution. The characteristic
surface plasmon resonance (SPR) absorption bands were obtained at around 420 nm. The XRD results
showed that the resultant crystalline silver nanoparticles of Eastern Nigerian Propolis Extract (ENPEAgNPs) has FCC structure, with a mean nanoparticle size of 5.067 ± 1.465. The STEM image revealed
several oval structures that were densely filled with AgNPs, which appeared as white spots, with
patterns that appeared homogeneous. In the presence of 1000 ppm ENPE-AgNPs, the results showed
high inhibition efficiency of 98.23 and 91.34 % for EIS and gravimetric technique, respectively. Also,
the thermodynamic and adsorption characteristics of ENPE-AgNPs on CS in HCl solution were
calculated. It was discovered that the ENPE-AgNPs performed well as an inhibitor of CS corrosion in
HCl.
... Thise resulted in high corrosion resistance with an efficiency of 99.91 ± 0.10% in the acidic condition of 0.5 M H 2 SO 4 and 2 ppm HF. Umoren et al. [66] used chitosan-copper oxide (CHT-CuO) by changing the amount of chitosan (0.5, 1.0, and 2.0 g) as a CI for X60 carbon steel in an acidic media of 5 wt.% HCl. ...
Science and engineering research studies are currently concentrating on synthesizing, designing, producing, and consuming ecologically benign chemical species to replace harmful chemicals. This is due to the increasing demands of conservation knowledge and strict ecological regulations. Numerous environmentally friendly substitutes produced from natural resources, including biopolymers, plant extracts, chemical pharmaceuticals (drugs), and so on, are now frequently used as inhibitors to replace dangerous corrosion inhibitors. Many compounds have been extensively used. A range of methods, including physisorption, chemisorption, barrier protection, thin-film growth, and electrochemical procedures, will be used to provide corrosion resistance. The various kinds of corrosion inhibitors (CIs), the mechanisms underlying inhibition, and the evaluation procedures have all been covered in-depth. This review provides an overview of the relevant literature in which researchers and scientists used different types of CIs, the effect of CIs on metals, and information about designs and mechanisms used to minimize corrosion in a variety of equipment composed of alloys or metals, along with electrochemical evaluation studies. This review will provide scholars with fresh insights to advance the discipline.
... As our contribution to the growing interest towards the assessment of polymermetal/metal oxide NCP as a means of improving corrosion retardation capacity of polymers (natural and synthetic), we had earlier reported the corrosion inhibition performance of chitosan-CuO NCP for CS in acid environment and the influence of KI addition [22]. Results obtained show that the corrosion inhibition performance of chitosan-CuO NCP was enhanced in the presence of KI. ...
... The coupons were removed from the test fluids after 24 h of submersion. The coupons were cleaned following previously reported procedures [22] and reweighed. The weight loss was taken as the difference between the weights of the coupons before and after submersion. ...
... All the extracted parameter values are collected in Table 2. The inhibitory efficacy and the capacitance of the double layer (C dl ) were calculated using the following equations [28,29]: ...
In the pickling industry, corrosion can deteriorate the quality of equipment and supplies, causing financial losses and safety threats. Therefore, it has become crucial to develop novel corrosion inhibitors that are bioactive, efficient, affordable, medium-acid soluble, and ecologically safe to protect mild steel during industrial cleaning. In this work, three newly synthesized imidazo[1,2-a]pyridine derivatives were characterized by various spectroscopic techniques. The studied compounds were evaluated as corrosion inhibitors for mild steel in 1 M HCl medium using weight-loss, potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques. The imidazopyridine derivatives showed excellent anticorrosion performance, their inhibitory efficiencies increased with the increase of inhibitors concentration and evolved in the following order: Imd2 (98.1%) >Imd1 (96.5%) >Imd3 (95.3%). This order was justified by the presence of two chlorine atoms in the ortho position of the Imd2 structure. The three Imd derivatives obeyed to the Langmuir isotherm, this explained the formation of an organic monolayer on the steel surface indicated by the scanning electron microscope (SEM) and the atomic force microscope (AFM). In addition, density functional theory (DFT) and molecular dynamics (MD) simulations were performed to reveal the anticorrosion mechanism. The present study illustrates at the microscopic level how mild steel resists corrosion and ensures the safety of pickling.
... The production, characterization, and anticorrosion effectiveness of chitosan and its cobalt (chitosan-Co) and SnS2 (chitosan-SnS2) nanocomposites for mild steel in 1 M HCl were described by Verma et al. 99 Chitosan showed 77% protection efficiency in its pure form, but this value improved to more than 95% and 80% in the addition of chitosan-Co and chitosan-SnS2 nanocomposites, respectively. Using gravimetric and electrochemical methods, Umoren et al. 100 investigated the corrosion inhibitive potential of chitosan-AgNPs for mild steel in cooling water. ...
Microbiologically induced corrosion caused by both aerobic and anaerobic bacteria is most common in various industrial sectors. Corrosion inhibitors are classified as environmentally friendly according to several criteria such as toxicity, bioaccumulation, and biodegradation. The known dangerous effects of most synthetic organic inhibitors and the need to develop inexpensive, non-toxic, and environmentally friendly processes have now prompted researchers to focus on using natural products. This article discusses the bio-corrosion inhibitory properties of many sustainable and innovative technologies in the oil and gas fields and highlights an alternative variety of environmentally friendly and non-toxic corrosion inhibitors.
... The samples were immersed in the SCPs for a sufficient period (approximately 12 hours) to allow the OCP to stabilize. After stabilization, the open circuit potential (Eoc) was determined, and the samples were polarized in the (-250 to +250) mV/SCE range with regard to the OCP [18]. At room temperature (25 ±1), the scanning rate was 0.125 mV/s [18], and the specimens' corrosion current densities (icorr) were determined using the Tafel extrapolation method, illustrated in Figure 3. Figure 3. ...
... After stabilization, the open circuit potential (Eoc) was determined, and the samples were polarized in the (-250 to +250) mV/SCE range with regard to the OCP [18]. At room temperature (25 ±1), the scanning rate was 0.125 mV/s [18], and the specimens' corrosion current densities (icorr) were determined using the Tafel extrapolation method, illustrated in Figure 3. Figure 3. Typical Tafel extrapolation plot [19]. ...
The research aims to investigate the impact of carbon steel grade on corrosion resistance in a synthetic concrete pore (SCP) solution. For this investigation, two grades of carbon steel as specified by ASTM A615-16 were selected, GR-60 (420MPa) and GR-80 (550MPa), respectively. In this study, the open circuit potential (OCP) and Tafel polarization plots were utilized and conducted at a temperature of 24 °C. In addition, the metallographic inspection was also performed for both grades. The electrochemical corrosion behavior of the two steel grades is assessed in the same (SCP) solution. The results showed that the open circuit potential of GR-80 of about (-375 mV) is nobler than GR-60 of (-385 mV), indicating the passive layer of GR-80 has better quality. In addition, the cathodic slopes of the Tafel plot for both grades are approximately equal (0.111 V/decade) for GR-80 and (0.107 V/decade) for GR-60. However, the anodic slope of GR60 (0.257 V/decade) is relatively higher than GR-80 (0.222 V/decade), indicating more iron (F ++) ions dissolution for GR-60. Consequently, the findings that were obtained via the application of the mixed potential theory and Faraday's law showed that the corrosion resistance of GR-80 (0.305 μm/y) in the same environment is more than that of GR-60 (0.353 μm/y) as a result of chemical changes and variances in steel's matrix microstructural characteristics that effect on the protective oxide layer formed on the steel surface.
Corrosion can bring serious safety issues, environmental issues, and economic losses. The use of corrosion inhibitors is an important technology for controlling metal corrosion. Compared to small molecule corrosion inhibitors, polymer corrosion inhibitors have better film-forming ability, multifunctionality, viscosity, high temperature resistance, solubility flexibility, and more attachment sites, making them one of the hotspots for the future development of corrosion inhibitors. Here, we review the research progress of natural polymers, polymeric surfactant, polymeric ionic liquids, β-cyolodextrin-based polymers and polymeric nanocomposite as corrosion inhibitors. These types of polymer corrosion inhibitors do not require a high molecular weight to achieve their desired functions and exhibit excellent corrosion inhibition performance. However, from the current application situation, polymer corrosion inhibitors still have some drawbacks. For example, although natural polymer modified polymers do not pollute the environment, their extraction and separation operations are cumbersome, and it is difficult to accurately analyze the active components of polymer corrosion inhibitors; Chemically synthesized polymer corrosion inhibitors still pose a threat to the environment and are not conducive to ecological protection. Here, we review the scientific research of polymer corrosion inhibitors and discuss solutions to make them practical industrial corrosion inhibitors. The major points are the following: 1) Whether substances with good corrosion inhibition performance can be grafted onto the polymer has become a key point in preparing efficient and soluble polymeric corrosion inhibitors; 2) Research and optimization of polymer synthesis processes or extraction and modification methods of natural polymer from the perspectives of material sources, solubility, dosage, and composition; 3) Develop inexpensive, efficient, and environmentally friendly polymer corrosion inhibitors to promote their practical industrial applications. We aim to propose broad application prospects and development potential for polymer corrosion inhibitors in industry.
