Corrosion Inhibitors For N80 Steel Research Articles

Okra leaves extract as green corrosion inhibitor for steel in sulfuric acid: Gravimetric, electrochemical, and surface morphological investigations

Utilizing plant extracts as an alternative source for corrosion inhibitors holds significant promise in minimizing the risk of corrosion. In this study, an okra leaf extract (OLE) was employed as a corrosion inhibitor for N80 steel in 1.0 M H2SO4. The corrosion rate was assessed concerning temperature (30, 40, 50, and 60 °C) and inhibitor concentrations (blank, 25, 50, 75, and 100 ml/l) through weight loss and electrochemical polarization techniques. The results indicated that OLE functions as a mixed-type corrosion inhibitor, with corrosion rates increasing with temperature and decreasing with inhibitor concentration. The maximum corrosion inhibition efficiency reached 96 % at 30 °C and 100 ml/l. Adsorption studies revealed that OLE physically adsorbed onto the mild steel surface, following the Langmuir adsorption isotherm. Gravimetrical and electrochemical techniques were confirmed by FTIR and UV measurements, which showed the presence of a protective layer on the metal surface. Optical microscopy, AFM, and SEM images demonstrated the formation of a protective layer on the metal surface. Thermogravimetric analysis (TGA) highlighted the thermal stability exhibited by inhibitor molecules, which showed that OLE was thermally stable up to 85 °C.

Graphene oxide composite as a novel corrosion inhibitor for N80 steel in 15 % HCl: experimental and quantum chemical examinations

Abstract Graphene oxide (GO) consists of many functional groups containing oxygen that helps in its chemical modifications. Thus, we have explored the synthesis, and corrosion inhibition application of n-butylamine (nBA) functionalized GO, i.e., GO-nBA for N80 steel in the acidizing environment (15 % HCl). NMR and TEM characterized the GO-nBA. The performance of GO-nBA was evaluated via chemical and electrochemicals methods that are supported by surface examination techniques. The PDP results supports the mixed nature of protection ability of GO-nBA. Additionally, the excellency of GO-nBA is confirmed by the value of 93.93 % efficiency. The surface study furthermore represents smooth texture with the addition of GO-nBA. The computational analysis reveals excellent inhibitive performance of GO-nBA.

Ecofriendly β-N-butyl amino propionic acid as green corrosion inhibitor for N80 steel in CO2-saturated brine water

Ecofriendly β-N-butyl amino propionic acid as green corrosion inhibitor for N80 steel in CO2-saturated brine water

PH‐Responsive Chitosan Microspheres Loaded with Gemini Imidazolium‐Based Ionic Liquids as Smart Corrosion Inhibitors for N80 Steel in Hydrochloric Acid Solution

Chitosan microspheres (CSM) loaded with synthesized Gemini imidazolium‐based ionic liquids ([C2(Bim)2]Cl2@CSM and [C6(Bim)2]Br2@CSM) are constructed as smart corrosion inhibitors to protect N80 steel in hydrochloric acid solution. The optimal inhibition efficiency of [C2(Bim)2]Cl2 and [C6(Bim)2]Br2 at 300 mg L−1 reaches 94.68% and 95.96%, respectively, indicating mixed‐type inhibition behavior. On this basis, the prepared [C2(Bim)2]Cl2@CSM and [C6(Bim)2]Br2@CSM can proactively identify corrosive environments and protect the metal. The microspheres are pH‐responsive owing to the presence of Schiff‐base C═N bonds and the loaded inhibitors can be released rapidly in acidic environment. Released inhibitors are delivered to corroded sites and synergistically interact with decomposed microspheres for enhanced corrosion inhibition effect.

Synergistic mechanism of ternary green corrosion inhibitors for N80 steel in 20 wt% HCl solution: Encapsulation and transportation of vanillin through micelles formed by ionic liquids

The encapsulation and directional transport to iron surface of green and poorly water-soluble vanillin were achieved by self-assembled micelles of ionic liquids formed by 1-hexadecyl-2,3-dimethyl imidazolium bromide and sodium dodecyl benzene sulfonate. The anti-corrosion performance of the system for N80 steel in 20 wt% hydrochloride solution at 90 ℃ was studied by weight-loss method, electrochemical tests, and surface analysis. The reaction activity of corrosion inhibitors and self-assembled film formation mechanism at high temperature were revealed by quantum chemistry and molecular dynamics simulation. The results shows that the system exhibits excellent synergistic corrosion inhibition effect via hydrogen bond, electrostatic interaction, and hydrophobic effect.

Surface interaction and inhibition mechanisms of hydrazide derivatives on N80 steel in acidizing media: A comprehensive analysis through experimental and theoretical methods

This study evaluates hydrazide derivatives, PEH and PAH, as corrosion inhibitors for N80 steel in acidic conditions. Utilizing a blend of experimental tests and theoretical calculations, including EIS, PDP, SEM, DFTB, and MD simulations, up to 96% inhibition efficiency was attained. Specifically, the PAH compound displayed notable protection. The Langmuir adsorption model confirmed dual adsorption, and theoretical simulations revealed interaction mechanisms. The research provides valuable insights into the formation of covalent bonds between inhibitor molecules and iron atoms, and offers a promising path for the development of advanced corrosion inhibitors suitable for industrial applications.

Tobacco Rob Extract as Green Corrosion Inhibitor for N80 Steel in HCl Solution

Tobacco Rob Extract as Green Corrosion Inhibitor for N80 Steel in HCl Solution

A quinoline-based quaternary ammonium salt dimer as corrosion inhibitor for N80 steel in lactic acid solution

In an effort to develop an effective corrosion inhibitor which is applicable to the chelating acidizing fluids in petroleum production, a novel heterocyclic quaternary ammonium salt dimer (TQD) was synthesized through the reaction of quinoline with 4-chloromethylthiazole hydrochloride. An analogue compound, benzyl quinolinium chloride dimer (BQD), was also prepared for comparison. Their anti-corrosion performances in 15% lactic acid solution were investigated through weight-loss experiments, electrochemical tests, surface morphology observation and simulation calculations. The outcomes demonstrate that inhibition efficiency of 99.38% has been achieved with 0.1% TQD at 363 K, which is much higher than that of BQD at the same condition. Both inhibitors were consistent with the Langmuir model, and both were hybrid adsorption, including physical and chemical adsorptions. According to the results of surface analysis (SEM, AFM, XPS, contact angle) and theoretical calculation (DFT and MD), TQD can effectively slow down the metal corrosion in lactic acid and thus is a promising inhibitor for oil and gas well acidizing purpose. The stronger adsorption capacity of TQD may come out of the contribution of thiazole rings in the molecules.

Design, characteristics, and theoretical analyses of 8-hydroxyquinoline derivatives with different heteroatoms as effective corrosion inhibitors

This study focuses on the corrosion inhibition of N80 steel by 8-hydroxyquinoline derivatives in 1 M hydrochloric acid medium. Firstly, three corrosion inhibitors containing different heteroatoms, namely N-dodecyl-5-amino-methyl-8-hydroxyquinoline (12N-HQ), 5-dodecyloxy-methyl-8-hydroxyquinoline (12O-HQ), and 5-dodecylthio-methyl-8-hydroxyquinoline (12S-HQ) were synthesized from 1-dodecylamine, 1-dodecanol, 1-dodecanethiol, and 8-hydroxyquinoline. The structures of the synthesized products were characterized by infrared spectroscopy and nuclear magnetic resonance hydrogen spectrometry. The effects of 12N-HQ, 12O-HQ, and 12S-HQ on the corrosion of N80 steel in hydrochloric acid solution were studied by electrochemical measurements: electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). The surface analysis of N80 steel was carried out using infrared spectroscopy (FT-IR), scanning electron microscopy (FE-SEM), and X-ray diffractometer (XRD). The IR and 1HNMR spectra results confirmed the generation of characteristic peaks of C-N-C, C-O-C, and C-S-C, indicating that the products were 12N-HQ, 12O-HQ, and 12S-HQ. The PDP results demonstrated that the 12N-HQ, 12O-HQ, and 12S-HQ corrosion inhibitors were all mixed corrosion inhibitors. The EIS results were 93.60%, 93.37%, and 95.31% corrosion inhibition efficiency for the three inhibitors at a concentration of 1 mM, respectively. The FT-IR, FE-SEM, and XRD studies showed that 12N-HQ, 12O-HQ, and 12S-HQ molecules adhered and constructed a surface protective layer on the surface of N80 steel. Density flooding theory (DFT) calculations and molecular dynamics simulations (MD) better explain the influence of 12N-HQ, 12O-HQ, and 12S-HQ molecular structures and electrons on corrosion resistance, in addition to the results obtained by DFT and the simulation of MD agree with the experimental results.

Research on 1,10-phenanthroline quaternary ammonium salt composite corrosion inhibitors for oilfield acidizing at high temperatures and high HCl concentrations

1-Benzyl-1,10-phenanthrolin-1-ium bromide (PQBr) was synthesized as a corrosion inhibitor for N80 steel, and its corrosion inhibition at high temperatures and high HCl concentrations was investigated via the weight-loss method. The addition of PQBr other additives reduced the corrosion rate of N80 carbon steel in 20% HCl at 453 K and 3 MPa to 59.93 g·(m2·h)−1. The adsorption of PQBr onto the surface of N80 carbon steel was evaluated by SEM, EIS, and PDP. An adsorption model and kinetic parameters of PQBr had been generated and determined. DFT calculations were performed to analyze the effect of the PQBr structure on adsorption.

Superior Long-Term Corrosion Inhibition of N80 Steel by New Eco-friendly Hydrazone-Based Compounds in a Simulated Oil Well Acidizing Environment: Establishing the Mechanism at the Molecular Level

The acid treatment process of production wells is one of the most acid-induced corrosive processes. Corrosion inhibitors are an effective tool to inhibit the acids employed in acidizing treatments. Herein, new eco-friendly hydrazone-based compounds, namely, 2-(4-isobutylphenyl)-N-((1E,2E)-3-phenylallylidene) propanehydrazide (IPP) and N'-cyclohexylidene-2-[4-(2-methylpropyl)phenyl] propanehydrazide (CIP), were prepared through the functionalization of ibuprofen (IBF) and applied for corrosion mitigation of N80 steel in 15 wt % HCl (referred to hereafter as blank). The anticorrosion performance of selected compounds was investigated by employing weight loss (WL), potentiodynamic polarization curves (PPCs), and electrochemical impedance spectroscopy (EIS), complemented by scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses. In addition, density functional theory-based tight-binding (DFTB) modeling was conducted to get molecular-level insights into inhibitor-metal bonding. Experimental results revealed excellent long-term corrosion inhibition efficiency at very low concentrations of inhibitors and a mixed-type inhibition process. Numerically, N80 steel polarization resistance increased from 5.51 Ω cm2 in blank to 608.4 and 396 Ω cm2 in blank inhibited with 5 × 10-3 mol/L of IPP and CIP, respectively, equivalent to 99% and 98% inhibition efficiency based on EIS experiments. Besides, SEM and AFM images showed that, after addition to 15 wt % HCl, inhibitors could effectively prevent the acid attack on the N80 steel surface. The fitting of experimental data to adsorption isotherms indicated that inhibitors' adsorption followed the Langmuir isotherm model and mixed physicochemical adsorption on the metal surface. The DFTB simulation revealed that inhibitor molecules can create covalent and physical interactions with iron atoms, which is further confirmed by partial density of states (PDOSs) analysis.

Synthesis and Corrosion Inhibition Performance of Mannich Bases on Mild Steel in Lactic Acid Media.

Heterocyclic Mannich bases, N-(3-oxo-3-phenylpro-pyl)thiazol-2-aminium chloride (DTZA) and N-(3-oxo-3-phenylpropyl)-1H-pyrazol-3-aminium chloride (DPZA), were developed for the corrosion inhibition of N80 steel in a 15 wt % lactic acid solution. Weight loss measurements, electrochemical techniques, surface characterization, and theoretical calculations were combined to investigate their anticorrosion performance and mechanism. The results showed that DTZA exhibited a satisfactory inhibitor efficiency of 97.56% with a dosage of 0.15% at 363 K, while DPZA achieved only 58.3% under the same conditions. Adsorptions of both inhibitors on the metal surface followed the Langmuir model with physical and chemical adsorptions. Based on X-ray photoelectronic spectroscopy (XPS) analysis, DFT calculations, and molecular dynamics (MD) simulations, stronger interactions between DTZA and iron than those in the case of DPZA were revealed, leading to the formation of a compact protective film on the metal surface, which is attributed to the presence of a thiazole ring in the DTZA chemical structure.

Amphiphilic carbon dots as high-efficiency corrosion inhibitor for N80 steel in HCl solution: Performance and mechanism investigation

Three amphiphilic carbon dots (CDs, C6-CDs, C8-CDs, and C12-CDs) were synthesized and first adopted as a corrosion inhibitor for mild steel. The inhibition behavior of amphiphilic CDs for N80 steel in hydrochloric acid solution was studied via weight loss tests, surface characterization, and electrochemical measurements. Results confirmed that they could protect N80 steel effectively; the longer the carbon chain was, the better the inhibition effect was. Specifically, the inhibition efficiency of C12-CDs reached 92.9 % at 150 mg/L. Moreover, due to the fluorescence characteristics of CDs, the changes in adsorption film during corrosion could be directly observed under UV light. A dense adsorption film was formed through the electrostatic interaction with CDs and the metal surface. Long carbon chains formed a hydrophobic layer on the surface of N80 to isolate the corrosive medium.

Newly Synthesized Morpholinyl Mannich Bases as Corrosion Inhibitors for N80 Steel in Acid Environment.

New Mannich bases, 3-morpholino-1-phenylpropan-1-one (MPO) and 3-morpholino-1-phenyl-3-(pyridin-4-yl) propan-1-one (MPPO), were synthesized, characterized, and studied as corrosion inhibitors for N80 steel in 1 M hydrochloric acid (HCl) solution using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and FT-IR spectroscopy. The inhibition efficiency increases with increasing inhibitor concentrations, and the corrosion inhibition efficiency of the MPO and MPPO could reach 90.3% and 91.4%, respectively, at a concentration of 300 ppm at 305 K. The effect of the temperature on the corrosion inhibition behavior of inhibitors was discussed. Electrochemical tests showed that the synthesized inhibitors are mixed. The EIS test results showed that the presence of MPO and MPPO reduced the double-layer capacitance in the corrosion process, thereby reducing the charge transfer resistance. The SEM and EDX results showed that the MPO and MPPO formed a uniform adsorption film on the surface of the N80 steel. The adsorption mechanism of the inhibitors was simulated with different adsorption models and the results showed that the inhibitors were the chemisorbed type. The results of the FT-IR spectroscopy proved that the inhibitor interacted with metal atoms on the steel surface.

Mechanistic evaluation of adsorption and corrosion inhibition capabilities of novel indoline compounds for oil well/tubing steel in 15% HCl

• The studied compounds competent corrosion inhibitors for N80 steel in 15% HCl. • The inhibition efficiency remains nearly constant at elevated temperatures. • The Langmuir isotherm confirms chemisorption of the studied corrosion inhibitors. • Generation of an organic–inorganic hybrid film protect the metal from corrosion. The investigation presents the superior corrosion inhibition capabilities of two novel indoline compounds namely 2-(1-(4-((furan-2-ylmethylene)amino)-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)-2-(1H-imidazol-2-yl)ethyl)isoindoline-1,3-dione (FTTI) and 2-(1-(4-((furan-2-ylmethylene)amino)-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)-2-methylbutyl)isoindoline-1,3-dione (FTMI) for oil well/ tubing steel in 15% HCl solution. The gravimetric studies confirm corrosion inhibition efficiency of 99.08% and 97.75% respectively at 303 K for significant low dosage of 50 μML -1 . The corrosion inhibition efficiency remained nearly constant at elevated temperatures due to predominant chemisorption of the inhibitors upon the metallic substrate. The chemisorption of the compounds is confirmed by the values of free energy of adsorption (Δ G ads ), which lie within the range of −47.60 kJmol −1 to −55.42 kJ mol −1 for FTTI and −45.95 kJmol −1 to −54.34 kJmol −1 for FTMI. The electrochemical analysis approves that the reduction in cathodic corrosion reaction (metal dissolution) occur through inhibitor adsorption upon the active sites; while the anodic reaction (hydrogen evolution reaction) is reduced due to thickening of the double layer at the metal solution interface. The substrate surface analysis through SEM, AFM, EDX and XPS reveal that the inhibitors generate an organic–inorganic hybrid protective film to protect the surface form aggressive acid solution. The theoretical studies through DFT and MDS justifies the experimentally obtained corrosion parameters and supports the superior corrosion inhibition capacity of FTTI over FTMI

Synthesis and characterization of novel dicarbohydrazide derivatives with electrochemical and theoretical approaches as potential corrosion inhibitors for N80 steel in a 3.5% NaCl solution.

Two novel ethanoanthracene-11,12-dicarbohydrazide derivatives N′11,N′12-bis((Z)-4-hydroxybenzylidene)-9,10-dihydro-9,10-ethanoanthracene-11,12-dicarbohydrazide (H2HEH) and N′11,N′12-bis((Z)-4-methoxybenzylidene)-9,10-dihydro-9,10-ethanoanthracene-11,12-dicarbohydrazide (H2MEH) were synthesized and characterized by FT-IR spectroscopy, electronic spectra, and NMR spectroscopy. These two derivatives as novel anticorrosion inhibitors for N80 steel in a 3.5% NaCl solution were studied using electrochemical techniques including potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM). Corrosion parameters and adsorption isotherms were determined from current–potential diagrams (i.e., Tafel slopes). The impact of temperature and inhibitor concentration on the corrosion performance was studied using the PP method. The PP results suggested mixed-type inhibitors. The inhibition prohibition increased and decreased when the dose was increased and the temperature was increased, respectively. The adsorption of the hydrazides on the N80 exterior followed the Langmuir isotherm. The maximum inhibition proficiency for H2MEH and H2HEH were 93.3% and 92.2%, respectively, at 1 × 10−4 M. Moreover, the investigated surface was studied with the synthesized compounds through X-ray photoelectron spectroscopy (XPS) to confirm the construction of an adsorbed shielding barrier. An evident association was established between the corrosion inhibition proficiency and theoretical variables acquired using the density functional theory (DFT) method and Monte Carlo (MC) simulations. The experimental data were in good agreement with the theoretical results.

Novel carbon dots as effective corrosion inhibitor for N80 steel in 1 M HCl and CO2-saturated 3.5 wt% NaCl solutions

In this work, the eco-friendly of functionalized carbon dots (N-CDs) was synthesized by the microwave method. The corrosion inhibition behavior of N-CDs for N80 steel in 1 M HCl and CO2-saturated 3.5 wt% NaCl solutions were systematically investigated by weight loss, electrochemical measurements and surface morphology. The results revealed that N-CDs exhibited outstanding inhibitory performance. The inhibitory efficiency in 1 M HCl and CO2-saturated 3.5 wt% NaCl solution at 70 °C reached 89.04% and 94.6% at 200 mg/L of N-CDs, respectively. Meanwhile, N-CDs was a mixed inhibitor that mainly suppressed the cathode in corrosion conditions (1 M HCl), while it was a mixed inhibitor that primarily inhibited the anode in the saline solution. In addition, based on the analysis and mechanism study of the surface of N80 steel, N-CDs followed the Langmuir adsorption isotherm and adsorbed on the metal surface through physical and chemical adsorption to inhibit corrosion, which fully explained the inhibition mechanism of N-CDs at metal/solution interface. Therefore, this work could provide new ideas for exploring efficient and environmentally friendly corrosion inhibitors.

Bis-Mannich bases as effective corrosion inhibitors for N80 steel in 15% HCl medium

Three novel bis-Mannich bases (named as M-n-M) have been synthesized by condensation reaction of acetophenone and formaldehyde with different aliphatic diamines (n represents the number of carbon atoms in the diamines). Their corrosion inhibition behaviors for N80 steel in 15% HCl solution were evaluated through weight loss measurements, electrochemical tests, scanning electron microscope (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and contact angle measurements. The results showed that the inhibition efficiency was increased with concentration as well as the alkyl chain length of the inhibitor, with the best inhibitor efficiency obtained as 98.20% for 0.3 % M-8-M in 15% HCl at 90 °C. The electrochemical tests revealed these inhibitors are mixed control type. SEM, AFM, XPS and contact angle measurement results revealed that the inhibitors form a compact adsorption layer on N80 steel surface. Adsorption mechanism of the inhibitors obeys the Langmuir isotherm, and physical adsorption and chemical adsorption exist simultaneously. M-8-M was compared with two commercial inhibitors at elevated temperature and gave a satisfactory corrosion rate of 15.13 mm·y−1 on N80 steel in 15% HCl at 120 °C.

Facile preparation of new hydrazone compounds and their application for long-term corrosion inhibition of N80 steel in 15% HCl: An experimental study combined with DFTB calculations

Developing safer and environmentally responsible corrosion inhibitors is of great significance for protecting pipelines from corrosion damage during acidizing processes. It is a never-ending task for oil service companies and researchers. Herein, new hydrazone compounds, namely (E)-2-(4-isobutylphenyl)-N'-(4-methoxybenzylidene)propanehydrazide (MHDZ), and (E)-N'-(furan-2-ylmethylene)-2-(4-isobutylphenyl)propanehydrazide (FHDZ), bearing ibuprofen moiety were synthesized and investigated as green corrosion inhibitors of N80 steel in 15% HCl using chemical and electrochemical techniques complemented with field emission scanning electron microscope (FE-SEM), atomic force microscopy (AFM) and density functional tight-binding (DFTB) modeling. Results obtained showed that both hydrazones acted as effective mixed-type inhibitors, protecting the N80 steel in 15% HCl at 303 and 333 K. Inhibition efficiencies of 98.5% and 98.0% were obtained at 303 K and optimum concentrations of FHDZ and MHDZ, respectively. The anticorrosion properties of investigated hydrazones toward N80 steel dissolution were also evaluated gravimetrically at 333 K, and inhibition efficiencies of 92.3% and 90.5% were obtained in the same order at optimum concentrations. FE-SEM and AFM results proved the formation of a preventive layer on the N80 steel surface against acid corrosion. The adsorption energies computed from DFTB calculations successfully predicted the experimental inhibition performance. We have found strong covalent bond formation between inhibitor molecules and Fe-atoms, which was confirmed by the projected density of states (PDOS). This study provides an experimental and atomic understanding of the corrosion inhibition mechanisms of N80 steel by hydrazone molecules, which could open a new way to develop effective eco-friendly corrosion inhibitors for well acidization.

Corrosion Inhibition of N80 Steel by Newly Synthesized Imidazoline Based Ionic Liquid in 15% HCl Medium: Experimental and Theoretical Investigations

Corrosion Inhibition of N80 Steel by Newly Synthesized Imidazoline Based Ionic Liquid in 15% HCl Medium: Experimental and Theoretical Investigations