Compatibility of fabrication of superhydrophobic surfaces and addition of inhibitors in designing corrosion prevention strategies for electrodeposited nickel in saline solutions

Improved corrosion resistant performance of mild steel under acid environment by novel carbon dots as green corrosion inhibitor

This paper studies the corrosion inhibition performance and mechanism of dextrin (Dxt) and its graft copolymer with caprolactam (Dxt-g-CPL) on J55 steel in 1 M HCl solution. Caprolactam is grafted and copolymerized with dextrin by a chemical synthesis method, to obtain a dextrin graft copolymer corrosion inhibitor. The composition of the synthesized graft copolymer was characterized by FTIR to identify whether the grafting was successful. Through weightlessness, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curve (TAFEL), scanning electrochemical microscope (SECM), scanning electron microscope (SEM), and contact angle experiments, the graft copolymer to J55 steel in 1 M HCl solution and the corrosion inhibition performance were evaluated. Moreover, we discuss its corrosion inhibition mechanism. The dextrin graft copolymer has good corrosion inhibition performance for J55 in 1 M HCl solution. When the concentration of the corrosion inhibitor increases, the corrosion inhibition efficiency will also increase. At a certain concentration, when the temperature rises, the corrosion inhibition efficiency will gradually decrease. When the concentration is 300 mg/L, it has a better corrosion inhibition effect, and the corrosion inhibition efficiency is 82.38%. Potential polarization studies have shown that Dxt-g-CPL is a mixed corrosion inhibitor, which inhibits both the cathode and the anode of the electrode reaction. SEM, SECM, and contact angle analysis results show that Dxt-g-CPL can significantly inhibit corrosion. Compared with Dxt, Dxt-g-CPL has a better inhibitory effect.

In order to reduce the investment of corrosion inhibitors, based on experimental and theoretical studies, the corrosion inhibition and mechanism of new imidazoline derivatives (SMIS) and 2‐aminopyridine (AMP) were investigated carefully. The best corrosion inhibition effect was at 0.7‐g/L SMIS and 0.3‐g/L AMP, the corrosion inhibition efficiency of weight loss, electrochemical impedance spectroscopy, and potentiodynamic polarization (Tafel) were 90.54%, 98.56% and 97.68%, respectively. Electrochemical research shows that SMIS&AMP belongs to cathodic corrosion inhibition. SMIS&AMP mainly increased the film resistance and charge transfer resistance in 1‐M HCl, thus playing a certain role in corrosion inhibition. X‐ray photoelectron spectroscopy and energy dispersive spectrometer proved that SMIS&AMP can be adsorbed on the surface of Q235, molecular dynamics showed that there was a certain synergy between SMIS and AMP. This study confirmed that SMIS and AMP have a good synergistic effect, improve the corrosion inhibition efficiency, reduce the synthesis cost of SMIS, and have a certain guiding significance for synergistic corrosion inhibition.

Schiff’s base with center of symmetry as an effective corrosion inhibitor for mild steel in acid medium: Electrochemical & simulation studies

Unveiled understanding on corrosion inhibition mechanisms of hydrazone derivatives based on naproxen for mild steel in HCl: A joint experimental/theoretical study

ObjectivesA regioselective approach has been developed for the synthesis of benzopyranophenazine derivatives using In (OTf)3 as a catalyst in one‐pot synthesis. Further, these synthesized compounds were successfully used as organic corrosion inhibitors on mild steel in 1M H2SO4 solution.MethodsThe synthesized organic inhibitors were confirmed using NMR, and HRMS and their regioselectivity was confirmed by DFT studies using the B3LYP/6‐31G (d, p) basis set. Further, the corrosion, and inhibition efficiencies were confirmed by various methods such as weight loss technique, electrochemical impedance spectroscopy, and potentiodynamic polarization studies.ResultsThe two synthesized compounds MBPPand BBPP show excellent corrosion inhibition properties than the previously reported organic inhibitors, especially, the electron‐donating nature of methoxy‐substituted phenazine derivatives show superior corrosion inhibition properties as 98.96 in 900 ppm than electron withdrawing bromo substituted phenazine derivative in the same concentration which indicates that the electronic structure of the organic inhibitor plays an important role in the corrosion inhibition efficiency of mild steel in an acid medium.ConclusionThe synthesized compound efficiently inhibits the corrosion on the mild steel surface and it forms a barrier on the metal surface. As a result, the phenazine derivatives of both MBPP and BBPP act as very effective corrosion inhibitors and the electron‐donating nature of MBPP shows more inhibition efficiency than BBPP inhibitors.

Green corrosion inhibitors are gaining recognition for their sustainable, cost-effective, and environmentally friendly nature, along with their impressive water solubility and high corrosion inhibition efficiency. They offer a promising solution to combat corrosion issues that plague various industries. However, to harness the full potential of these eco-friendly corrosion inhibitors, a profound understanding of their development and underlying mechanisms is essential. This knowledge is the key to paving the way for the next generation of corrosion protection materials. Herein, a comprehensive study was conducted to understand the adsorption, corrosion inhibition efficiency, and stability of 3-benzoyl-4-hydroxy-2,6-bis(4-methoxyphenyl)-4-phenylcyclohexane-1,1-dicarbonitrile (BMPD). This study investigated the performance of BMPD applied to carbon steel (CS) in 1 M hydrochloric acid (HCl) solution. The corrosion inhibition effect was examined using weight loss, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and theoretical studies. The surface morphology was also characterized and Tafel polarization analysis shows that BMPD is a mixed inhibitor. The results obtained by electrochemical impedance spectroscopy indicate that the inhibitory effect increases with increasing inhibitor concentration. The adsorption of BMPD on a CS surface obeyed the Langmuir adsorption isotherm. Thermodynamic parameters were calculated and discussed. Furthermore, this study involved a comprehensive computational analysis of the BMPD compound. Using quantum chemical calculations and first-principle simulations, we delved into the structural and electronic properties of BMPD as well as the interfacial adsorption mechanisms between the studied molecule and the iron surface.

The corrosion inhibition effectiveness of dissolved Li2CO3 and Li2C2O4 was studied for Mg alloy AZ31B in 0.1 M NaCl solution. The electrochemical and corrosion inhibition properties of Li salts were studied using potentiodynamic polarization, linear polarization resistance, electrochemical impedance spectroscopy, and H2 evolution measurement methods. The corrosion inhibition efficiency as a function of immersion time was also investigated. The morphology and chemical composition of AZ31B surfaces after 24 h immersion in 0.1 M NaCl with and without the addition of dissolved Li salts revealed considerable differences in corrosion properties. The role of Li+ ions, ions, and on corrosion inhibition of AZ31B was focused and their role in corrosion inhibition was discussed. Li2CO3 had better corrosion inhibition efficiency compared to Li2C2O4 in 0.1 M NaCl solution at ambient temperature. The optimum concentration of Li2CO3 was 50 mM to provide the highest corrosion inhibition efficiency of 96.75%, while the optimum concentration and inhibition efficiency for Li2C2O4 were 3 mM and 82.84%, respectively. Surface characterization of the Li2CO3-inhibited AZ31B revealed that the enhanced corrosion protection was due to formation of a protective layer mainly composed of MgCO3. Corrosion studies over time showed that Li2CO3 could effectively provide corrosion protection for 48 h, while Li2C2O4 became ineffective after 12 h of immersion in 0.1 M NaCl.

The concentration effect of Tamarix Aphylla (TA) extract was investigated as a green corrosion inhibitor for carbon steel (E24) in saline solution. The extract was obtained by the maceration method using ethanol solution. Subsequently, the composition of the TA extract was characterized through a combination of phytochemical analysis, Fourier Transform Infrared Spectrometer (FTIR), and High-Performance Liquid Chromatography (HPLC). The TA extract was found to be rich in polyphenols (582.5 mg GAE per g of dry weight), with vanillic and para-coumaric acids as the primary polyphenolic compounds. Additionally, the extract demonstrated strong antioxidant activity, with an IC50 value of 5.33 mg mL−1. These results suggest that TA could be an effective corrosion inhibitor. For this reason, it was tested as an eco-friendly corrosion inhibitor for E24. Corrosion inhibition performance was assessed using several electrochemical techniques: open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (Tafel) measurements to determine the optimal inhibitor concentration for minimising the corrosion rate of steel. The morphology of the steel surface was analyzed using scanning electron microscopy (SEM). The results indicated that the TA extract, at an optimal concentration of 50 ppm, provides excellent corrosion protection in saline solution (∼98% inhibition according to Tafel and ∼80% according to EIS). TA acted as an anodic inhibitor. In this study, the extract effectively formed a protective film on the steel surface, enhancing its resistance to corrosion. At higher concentrations, the protective efficiency decreased, likely due to heterogeneous film formation, as shown by SEM-EDX analyses. TA adsorption followed the Langmuir isotherm. Thermodynamic and electrochemical data suggest mainly physisorption. The corrosion inhibition mechanism was shown to be strongly dependent on the extract concentration, and a comprehensive explanation is provided below, suggesting a potential for practical application in corrosion prevention.

The present study focuses on an environmental approach based on the use of an eco-friendly corrosion inhibitor from the Citrullus colocynthis fruit extract for enhancement corrosion resistance of carbon steel (C-S) in acid medium as an alternative to various organic and non-organic chemical inhibitors. The evaluation of the inhibition properties of the fruit methanolic extract of Citrullus colocynthis (CCE) were performed in molar hydrochloric acid (1M HCl) medium using gravimetric and electrochemical (potentiodynamic polarization and AC impedance) techniques as well as surface analyses. CCE is rich in amino acids, mainly citrulline and β-(pyrazo-1-yl)-L-analine molecules. Based on the weight loss evaluation, the results demonstrated that this plant extract acts as an effective corrosion inhibitor and a protection level of 93.6% was attained at 500ppm of CCE after 6h of metal exposure at 303K. According to polarization curves, CCE functions as a mixed-type inhibitor. In addition, AC impedance analyses have shown that the incorporation of CCE into the corrosive solution leads to a decrease in load capacity, while improving the charge/discharge function at the interface. This suggests the possibility of the formation of an adsorbed layer on the C-S surface. In addition, scanning electron microscope (SEM) observation, contact angle measurements, and Fourier-transform infrared spectroscopy (FTIR) analyses supported the development of a protective film over CS substrate surface afterwards addition of CCE. Langmuir and/or Temkin isotherms can be used to characterize the adsorption of this organic inhibitor on the C-S surface. X-ray photoelectron spectroscopy (XPS) has revealed that the inhibiting effect of CCE on the corrosion of C-S in 1M HCl solution is mainly controlled by a chemisorption process and the inhibitive layer is composed of an iron oxide/hydroxide mixture where CCE molecules are incorporated. In order to understand the relationship between the molecular structure and anti-corrosion effectiveness of these inhibitor molecules, quantum chemical studies were carried out using density functional theory (DFT) and molecular dynamics (MD) simulation.

Polymer corrosion inhibitors are reported to form dense films on carbon steel surfaces, and their thermostability enables survival in harsh downhole environments. In this paper, PEG-OTs was synthesized by mechanochemistry using ball mill by grafting tosyl on PEG. Using this solvent-free green chemistry, non-toxic PEG and PEG-OTs with various molecular weights (600, 2000, and 10,000 g/mol) were prepared and used as corrosion inhibitors. The corrosion inhibition performance of 5 × 10-3 mol/L inhibitors on Q235 carbon steel in 0.5 M HCl solution was investigated using static weight-loss, electrochemical impedance spectroscopy, polarization curves, SEM, and contact angle measurements. The results show that, after modification, PEG-OTs has an elevated corrosion inhibition effect compared to PEG. A maximum of 90% corrosion inhibition efficiency was achieved using static weight-loss. The morphology study shows that a dense film formed to protect carbon steel. Thanks to their polymeric structure, a higher molecular weight leads to better corrosion inhibition.

The study of m-pentadecylphenol on the inhibition of mild steel corrosion in 1 M HCl solution

The corrosion and scale inhibition efficiency of Mazuj gall extract in simulated cooling water has been evaluated. Potentiodynamic polarization, electrochemical impedance spectroscopy, gravimetric measurements, and ultraviolet–visible (UV–Vis) spectroscopy were used to investigate the corrosion inhibition efficiency and mechanism. Also, static beaker testing and scanning electron microscopy were applied to evaluate the scale inhibition performance of Mazuj gall extract. It was observed that 1000 ppm Mazuj gall extract provided promising corrosion inhibition efficiency of 94.3% and also excellent scale inhibition efficiency of 97.2%. According to adsorption studies and UV–Vis spectroscopy, the inhibition efficiency of extract can mostly be attributed to formation of insoluble Fe2+ complexes over the steel surface obeying the Langmuir isotherm model and behaving as an anodic-type corrosion inhibitor. It is concluded that Mazuj gall extract can be proposed as an efficient green inhibitor of scale formation and corrosion of mild steel in cooling water.

Plant extracts and bacterial biofilm are acknowledged to offer impressive corrosion-inhibitory activities. However, anticorrosive properties of their combination are still less reported. Thus, in the present study, we aimed to evaluate the corrosion inhibition efficiency of Saccharum officinarum bagasse (SOB) plant extract, Pseudomonas chlororaphis (P. chlororaphis), and Bacillus coagulans (B. coagulans) individually and in combination (SOB+P. chlororaphis) and (SOB+B. coagulans) using copper sheets in different acidic solutions (pH 5.5) and at three different temperatures (300 K, 305 K, and 310 K). The weight loss and electrochemical measurements were carried out to evaluate the corrosion rate and inhibition efficiencies. Alteration in the surface morphology of copper sheets was analyzed employing Fourier transform infrared (FTIR) spectroscopy, UV visible spectroscopy, scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX), and X-ray photoelectron spectroscopy (XPS). Amongst all, SOB extract alone exhibited the highest anticorrosive efficiency, whereas the combination of SOB with P. chlororaphis revealed excellent inhibition efficiency. Weight loss studies indicated that at 300 K, the combination of SOB extract with P. chlororaphis significantly reduces the corrosion rate up to 11.90% with the highest inhibition efficiency of 88.09%. However, with an increase in temperature, i.e. 310 K, the corrosion rate diminishes to 13.04% with inhibition efficiency of 86.95% for 500 µL concentration in HNO3 solution. The combination of an SOB extract with P. chlororaphis displayed a maximum corrosion inhibition efficiency of 85.11% in the potentiodynamic polarization (PP) study and 88.23% in the electrochemical impedance spectroscopy (EIS), respectively and found in agreement with the efficiency obtained in the weight loss study. Later, the synergistic parameter (SƟ) advocated that the SOB extract and P. chlororaphis do not interact mutually whereas ∆G°ads values suggested the physisorption of these agents on the copper plates follows Langmuir adsorption isotherm. The spectral analysis and SEM images of the copper plate revealed that the combination of SOB extract with P. chlororaphis forms a strong protective layer over its surface and prevents corrosion. In conclusion, the combination of SOB extract with P. chlororaphis holds impressive anticorrosive properties and may be explored further to attain their industrial utility.

In recent decades, large numbers of functionalized nanocomposites can act as the novel corrosion inhibitor in corrosive solution and coating systems. The microstructure and composition of the nanocomposite can be characterized using SEM, TEM, XRD, FTIR, XPS and UV methods. The corrosion inhibition efficiency was evaluated using weight loss method and some electrochemical tests, such as potentiodynamic polarization curves, electrochemical impedance spectroscopy and etc., in combination with surface characterizations (including SEM, EDS, AFM, XPS and contact angle tester, etc.). This contribution reviews briefly the recent advances in the synthesis and anticorrosion property of functionalized nanocomposite served as the corrosion inhibitor. The classification, advantages and disadvantages of functionalized nanocomposite for anticorrosion are discussed in details. The relevant mechanisms for corrosion inhibition of the functionalized nanocomposite are well elaborated.