Tafel Polarization Curves Research Articles

Plasma Sputtering of Nano-CaTiO3 Thin Film Applied for Surface Modification of Co–Cr Alloy

A biocompatible and corrosion-resistant coating was progressed by depositing a thin film of calcium titanate (CaTi[Formula: see text] on CoCr-based alloy substrate using a radiofrequency magnetron plasma sputtering process to improve the characteristics of the interface between the thin-film coating and the CoCr alloy substrate. In this technique, the best power was previously observed at 225 W to get good coating film deposition properties. This power was applied to a deposited thin film of CaTiO3 on a heated CoCr-based alloy at [Formula: see text]C using an argon gas atmosphere with purity (99.8%) under vacuum 1.00E-02 Torr. Different deposition rates and times were used to observe nanofilm, the thicknesses of (50 nm, 80 nm, 110 nm and 140 nm). Field-emission scanning electron microscopy (FESEM) was applied to study surface morphologies. X-ray diffraction (XRD) was used to study the crystalline structure of thin films deposited. The Vickers Micro-Hardness tests were implemented on each specimen. Vitro electrochemical corrosion tests (open circuit potential, Tafel polarization curve and cyclic polarization) of the coated and uncoated specimens were done, to find the optimal state that gives excellent resistance to corrosion in a simulated body fluid environment. The results of the experiments showed that as the thickness of the thin films increased, so did the hardness measurements. An enhancement in corrosion resistance also was clearly observed at a thickness of 140 nm CaTiO3 thin-film compared with uncoated and coated specimens at other nanothicknesses.

Tribo-corrosion interaction of the parallel steel wires in the suspension bridges

AbstractThe effect of contact load and relative displacement on tribo-corrosion interaction of parallel steel wires of main cable in the suspension bridge was investigated in this study. A self-made tribo-corrosion test bench was employed to conduct tribo-corrosion tests of parallel steel wires in 3.5% (wt%) NaCl solution and deionized water under different contact loads and different relative displacements. The friction coefficient and wear coefficient of wires were presented. Electrochemical corrosion behavior (Tafel polarization curves, Nyquist diagram, and equivalent circuit diagram) was characterized by electrochemical analyzer. Wear morphology was observed by scanning electron microscope. Wear volume loss and corrosion-wear interaction were quantitatively demonstrated by high-precision weighing balance. The results show that the electrochemical corrosion ability of the steel wires increases with the increase of the contact load or relative displacement. The increased contact load or relative displacement increases the volume loss of corrosion-wear and pure wear, but decreases the wear coefficient. The wear mechanisms in 3.5% NaCl solution are adhesive wear, abrasive wear, and corrosive wear as compared to adhesive wear and abrasive wear in deionized water under different contact loads. The wear mechanisms of parallel steel wires are slightly different under different relative displacements. But the main wear mechanisms are similar to that under different contact loads. The interaction effects of corrosion and wear produced by the contact load and relative displacement are all the synergistic effects.

Corrosion inhibition effect of 1-phenyl-5-mercaptotetrazole on nickel-aluminum bronze in seawater: A combined experimental and theoretical study

A combined experimental and theoretical study was performed on corrosion inhibition effect of 1-Phenyl-5-mercaptotetrazole (PMT) on nickel-aluminum bronze (NAB) in seawater. Gravimetric measurement and electrochemical method, such as the open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), Tafel polarization curve were used to verify the corrosion inhibition effect of PMT. It was found that the corrosion inhibition efficiency (IE) of PMT achieved 94.4 %, 99.5 %, 98.7 % at a concentration of 1.12 mM, respectively. The slump of the degree of corrosion on NAB surface was also revealed based on SEM and AFM images analysis with the addition of PMT. According to the Langmuir isotherm model based on EIS, PMT was confirmed as a mixed-type corrosion inhibitor between −20 kJ mol–1 and −40 kJ mol–1. Besides, the successful adsorption of PMT on NAB has been revealed by the results of XPS and the change of water contact angle on NAB surface. In combination XPS with quantum chemistry calculations, PMT molecules are adsorbed on the surface of NAB by the active S atom and the tetrazole ring as the major adsorption groups, thus, the protective barrier formed by PMT on the surface of NAB can effectively insulate NAB from contact with seawater. The research results in this paper have showed that PMT as a drug intermediate has an excellent corrosion inhibition effect on the NAB at extremely low concentration in seawater.

Effect of Current Density on Preparation and Properties of TF/β-PbO2 in MSA Media.

The lead-based alloy and DSA anodes have drawbacks, such as poor corrosion resistance, easy peeling of coating, low electrocatalytic activity, and environmental pollution in electrode preparation processes. In this study, titanium foam/β-PbO2 (TF/β-PbO2) was prepared by electrodeposition in methanesulfonic acid (MSA) media. The current efficiency and the deposition rate were 89.7% and 5.36 v/(μm·min-1) at the best current density of 80 mA·cm-2, respectively. The TF/β-PbO2 was characterized by electrochemical tests, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The cyclic voltammetry (CV) test shows that the anodic peak potential of the optimum TF/β-PbO2 was as low as 2.135 V and anodic voltammetry charge was up to the maximum value of 3.564 × 10-2 C. The linear sweep voltammetry (LSV) test indicates that exchange current density of the optimum TF/β-PbO2 reached the maximum value of 8.284 × 10-6 A·cm-2. CV and LSV tests indicate that the optimum TF/β-PbO2 had a high electrocatalytic activity. Electrochemical impedance spectroscopy test Tafel polarization curves show that the optimum TF/β-PbO2 had better corrosion resistance. The XRD test shows that the crystal was mainly β-PbO2 of the optimum TF/β-PbO2 surface and the current density affected the preferential growth of the crystal surface of PbO2. SEM tests show that grains of the optimum TF/β-PbO2 coating prepared were tightly bound and uniform in size.

Corrosion inhibition performance of an environmentally friendly water-based nano-inhibitor

Metal corrosion not only causes huge economic losses, but sometimes even endangers personal safety. Therefore, the requirements for the corrosion resistance of metals are becoming a significant problem. The use of inhibitor is still one of the most common and effective methods to prevent metal corrosion. An environmentally friendly water-based nano-inhibitor containing nano TiO2 was prepared in this work. The open-circuit potential-time curve revealed that the voltage stability value of the steel coated with the proposed inhibitor is −0.51 V, which is higher than −0.54 V of the blank steel plate and commercial inhibitor (-0.52 V), indicating that the proposed nano-inhibitor can improve the stability of the entire system. According to the Tafel polarization curve, the inhibitor coating can significantly increase the corrosion potential, and at the same time reduces the corrosion current density. The EIS plots show that the proposed inhibitor can increase the charge transfer resistance.

Influence of Li+/Al3+ on the corrosion behavior of Li-Al layered double hydroxides (LDHs) film on LA51 magnesium alloys

A hierarchical superhydrophobic Al-Li layered double hydroxide (LDH) films with different Li + /Al 3+ molar ratios of 1:1, 1:2, 2:1, pH value of 11.5 and reaction temperature of 125 °C, have been fabricated on the surface of Mg-5Li-1Al (LA51) alloys by hydrothermal method following the characteristics of controllable cation structure and exchangeable anion between layers. The properties of the films were investigated by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). XRD and SEM results indicate that the Al-Li LDH films are successfully prepared on LA51 alloys. The contact angle (CA) was measured to be about 100.7°, indicating that the surface wettability of the film converted from hydrophilic to hydrophobic by surface modification. The corrosion resistance of Al-Li LDH films was evaluated by Tafel polarization curve and electrochemical impedance spectroscopy (EIS). Surprisingly, Tafel polarization curve and EIS test reveal that the Al-Li LDH films prepared at the molar ratio of Li + /Al 3+ 1:2, pH 11.5 and temperature 125 °C have better corrosion resistance in 0.1 M NaCl neutral solution. In addition, the formation mechanism and corrosion mechanism of the films on the surface of LA51 alloy are also proposed. It provides innovative synthetic materials and novel design ideas for the preparation of high-efficiency anti-corrosion coatings on LA51 alloys, whose application can be extended in industrial fields.

Evaluation of the Corrosion Resistance of Different Types of Orthodontic Fixed Retention Appliances: A Preliminary Laboratory Study

(i) Objective: The present study aimed to compare the electrochemical corrosion resistance of six different types of fixed lingual retainer wires used as fixed retention appliances in an in vitro study. (ii) Methods: In the study, two different Ringer solutions, with pH 7 and pH 3.5, were used. Six groups were formed with five retainer wires in each group. In addition, 3-braided stainless steel, 6-braided stainless steel, Titanium Grade 1, Titanium Grade 5, Gold, and Dead Soft retainer wires were used. The corrosion current density (icorr), corrosion rate (CR), and polarization resistance (Rp) were determined from the Tafel polarization curves. (iii) Results: The corrosion current density of the Gold retainer group was statistically higher than the other retainer groups in both solutions (p < 0.05). The corrosion rate of the Dead Soft retainer group was statistically higher than the other retainer groups in both solutions (p < 0.05). The polarization resistance of the Titanium Grade 5 retainer group was statistically higher than the other retainer groups in both solutions (p < 0.05). As a result of Scanning Electron Microscope (SEM) images, pitting corrosion was not observed in the Titanium Grade 1, Titanium Grade 5 and Gold retainer groups, while pitting corrosion was observed in the other groups. (iv) Conclusion: From a corrosion perspective, although the study needs to be evaluated in vivo, the Titanium Grade 5 retainer group included is in this in vitro study may be more suitable for clinical use due to its high electrochemical corrosion resistance and the lack of pitting corrosion observed in the SEM images.

Development of Silane Functionalized ZnO Nanoparticles for Enhancing Anticorrosion Application

The effect of zinc oxide nanoparticles surface modified with N-[3-(Trimethoxysilyl)propyl]ethylenediamine (15.5 nm) on mild steel in 0.5M HCl at five different concentrations and temperatures has been studied using Electrochemical Impedance Spectroscopy (EIS) and Tafel polarization curves. Results show that the inhibition efficiency of synthesized mixed type of inhibitor increases up to 40˚C and then decreases because of both physical and chemical adsorption. The activation parameters calculated using Arrhenius plot confirmed chemical adsorption process. Adsorption process follows Langmuir adsorption isotherm and free energy of adsorption values proved the spontaneous adsorption of inhibitor on mild steel sample. Scanning electron microscopy (SEM) analysis also showed that the synthesized nanoparticle is efficient as corrosion inhibitor. Green synthetic method was adopted in synthesis of inhibitor by using Phyllanthus Emblica (Gooseberry) extract. The inhibitor was characterized by Fourier Transform Infra-red Spectroscopy (FT-IR) and X-Ray Diffraction techniques.

Investigation on corrosion behaviors of silver and LDB coated silver wires in 0.5 M NaCl

Silver (Ag) is used widely in the semiconductor industry for its good conductivity and stable corrosion behaviour in various environments. However, a chloride attack on Ag could change its properties and affect other sensitive behaviours of Ag. In the present work, the corrosion behaviours of Ag wire and Ag wire coated with black leather dye (LDB) through dip coating are examined in 0.5 M NaCl by electrochemical impedance spectroscopy (EIS), Tafel polarisation curves (TPC), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDX). LDB structure is investigated through Fourier transform infrared spectroscopy (FTIR), and LDB is found to contain numerous functional groups. Based on this fact, it is assumed that LDB can significantly suppress Ag corrosion; however, the results have not supported this assumption, and only a slight improvement in the corrosion behaviour of Ag wire has been noticed. The corrosion study on Ag and LDB coated Ag wires is also performed after 1 and 3 h of immersion in NaCl; however, the degradation in corrosion behaviour is acknowledged. Based on results, it is found that LDB is protecting Ag, but for short time immersion.

Chloroform extract of cucumber peels for Mild steel prevention in 0.5 M NaCl

Waste natural material has attracted the attention of many researchers and scientists for its use as a corrosion inhibitor due to their efficiency, economic cost and high biodegradability. In present report, the effect of chloroform extract of cucumber peel (CCE) is studied as natural, low cost and effective coating protection of Mild Steel (MS) in chloride (0.5 M NaCl) solutions. Characterization of CCE is performed by UV–visible (UVS) and Fourier transform infrared (FTIR) spectroscopy. Corrosion testing of MS and CCE coated MS are done in 0.5 M NaCl by open circuit potential (OCP) curves, electrochemical impedance spectroscopy (EIS) and Tafel polarization curves (TPC). Surface morphology was seen and analyzed by Field emission Scanning electron microscopy (FESEM). It is depicted from this work that CCE can effectively suppress MS corrosion in 0.5 M NaCl.

Ethanol extract of corn husk for mild steel corrosion prevention in saline water

Natural materials are used for corrosion prevention of metals due to their low cost, zero noxiousness, biomolecules, and effectiveness. However, natural materials are very less used for corrosion prevention as coating materials. In the present report, the ethanol extract of corn husk (EECH) is investigated as natural, low cost and effective coating material for mild steel (MS) protection in chloride (0.5 M NaCl) solutions. Characterization of EECH is performed by UV–visible (UVS) spectroscopy, which suggests that the EECH is chemically active. EECH layers (L) are coated on MS by drop casting. Corrosion testing of MS and EECH coated MS is done in 0.5 M NaCl by electrochemical impedance spectroscopy (EIS), open circuit potential (OCP) curves, and Tafel polarization curves (TPC). It is declared after analysis of the results that EECH prevention ability enhances with the count of layers and 3 L coated MS has given the best protection (77 %) among the tested ones. Surface morphology is analyzed by optical microscopy (OM) and Field emission Scanning electron microscopy (FESEM), which supports that EECH coated MS is less damaged in NaCl than alone MS. It is concluded based on this work that EECH can effectively suppress MS corrosion in 0.5 M NaCl.

Aqueous extract of grapes stems for mild steel protection in 0.5 M NaCl

Mild steel (MS) is consumed on high scale in engineering applications due to its good operational properties and cost effectiveness. However, chloride attack on MS can damage its properties and affect its service performance. In present work, the water extract of grapes stems (WEGS) is used to inhibit corrosion of MS in 0.5 M NaCl. WEGS is investigated through Fourier transform infrared spectroscopy (FTIR) and WEGS is found to contain numerous functional groups. The corrosion investigation is done by electrochemical impedance spectroscopy (EIS), open circuit potential (OCP), Tafel polarization curves (TPC), field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDX). The corrosion results favoured the fact that WEGS is inhibiting MS corrosion. This fact is also supported by FESEM and EDX analysis. The reason of corrosion inhibition is proposed as covering of MS surface by WEGS molecules.

Waste cucumber peels for sustainable suppression of Mild steel corrosion in salty water

Waste natural materials have become the preferred choice of scientists for corrosion inhibition of metals due to their cost effectiveness, economic availability, and high biodegradability. In the present report, the water extract of cucumber peel (CWE) is investigated for the protection of mild steel (MS) in salty (0.5 M NaCl) solutions. UV–visible (UVS) and Fourier transform infrared (FTIR) spectroscopy have been used to characterize CWE. It is found based on results that CWE has biomolecules. Tafel polarization curves (TPC), open circuit potential (OCP) curves, and electrochemical impedance spectroscopy (EIS) are used to investigate MS corrosion in 0.5 M NaCl with and without different amounts of CWE. The investigation suggests that the MS protection follows the CWE concentration. The maximum protection (44%) is acknowledged at 1000 mg/L of CWE. The surface morphology of MS is analyzed by field emission scanning electron microscopy (FESEM). The MS surface is found to be damaged due to pure NaCl attack. In opposite, the NaCl attack on MS is restricted by CWE. Based on overall investigation, it is claimed that CWE can moderately suppress MS corrosion in salty water.

Lotus leaves coating on copper substrates and their corrosion performances in sodium chloride solutions

In the present work, the chloroform extract of lotus leaves (CELL) has been prepared and one to three layers of it have been coated on copper (Cu) via drop casting in a layer-wise manner. Open circuit potential (OCP) and Tafel Polarization (TP) curves, as well as electrochemical impedance spectroscopy (EIS), were used to investigate the corrosion behaviors of pristine and different layers (1–3) coated Cu in 0.5 M NaCl. Cu substrates are also investigated with scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The electrochemical analysis indicates that 2 layers coated Cu is giving better performance (more positive OCP, greater impedance, lower corrosion current) than 1 layer and 3 layers coated Cu. Around 80 % of Cu saving in 0.5 M NaCl has been achieved with 2 layers of CELL coated Cu. The reason for protection is noticed as the effective coverage of Cu by CELL layers. However, the protection is compromised beyond 2 layers because it is found that CELL molecules are leaching out from various places on the Cu surface. The SEM results have also confirmed this fact. The EDX analysis of the Cu and coated Cu after corrosion suggests that 2L coated Cu is less attacked by O, Na, and Cl with respect to others, which indicates that the 2L of CELL coated Cu is the best performer against corrosion. A schematic is also provided to explain the protection of Cu by CELL.

Thin-Film Coating of the Hydrophobic Lotus Leaf on Copper by the Floating Film Transfer Method and Investigation on the Corrosion Behavior of Coated Copper in Saline Water

Copper (Cu) is an important base material for many electrical, thermal, and home applications. However, corrosion of Cu is a serious concern in chloride-containing solutions. The present work reports lotus leaf coating on Cu as a successful preventive solution. After preparation of a lotus leaf chloroform extract (LLCE), an ultrathin (15 ± 5 nm) film of LLCE is created by the floating film transfer method (FFTM) and transported on Cu through stamping. LLCE has been characterized by UV–visible spectroscopy (UVS), nuclear magnetic resonance (NMR), and Fourier transform infrared (FTIR) spectroscopy (FTIRS) techniques, which disclose that LLCE meets the expectations of being rich in biomolecules. The LLCE coating on Cu was done in a layerwise manner (1–3) and analyzed with scanning electron microscopy (SEM) and a drop shape analyzer (DSA). The SEM images show that there are films on Cu, and DSA suggests that LLCE coatings have increased the hydrophobicity of Cu (contact angle 96) to greater than 100. Open-circuit potential (OCP) curves, Tafel polarization (TP) curves, electrochemical impedance spectroscopy (EIS), SEM, energy-dispersive X-ray (EDX) spectroscopy, and atomic force microscopy (AFM) have been deployed to investigate the LLCE-coated Cu corrosion in 0.5 M sodium chloride. The LLCE film of three layers (3L) on Cu is found to be the most efficient (97%, TP) against corrosion among the tested ones. SEM and AFM images evidently show that the 3L-coated Cu was the least damaged through corrosion. The reason for prevention can be recommended as blockage of the openings on the bare Cu surface by LLCE films.

Synthesis of lignite-based Ni/C composite with low-medium temperature pyrolysis method as an efficient Pt-free counter electrode for dye-sensitized solar cells

In order to obtain inexpensive Pt-free counter electrode materials for dye-sensitized solar cells and expand the application fields of low-rank coal, lignite-based Ni/C composite was prepared by low-medium temperature pyrolysis method using Huolinhe lignite as raw materials. The structure and chemical components of as-synthesized lignite-based Ni/C composite was characterized by XRD, FT-IR, TG, Raman, SEM, TEM, and XPS, and the electrocatalytic activity of lignite-based Ni/C composite counter electrode was investigated by cyclic voltammetric curve, electrochemical impedance spectrum, and Tafel polarization curve. It is found that the electrocatalytic activity of the lignite was improved after low-medium temperature pyrolysis and composited with Ni species to form lignite-based Ni/C composite, which helps to catalyze the reduction of electrolyte and thus improve the photoelectric conversion efficiency of the solar cells. The photoelectric conversion efficiency (η) of the dye-sensitized solar cells based on the lignite-based Ni/C composite counter electrode was 3.42% (Jsc = 11.49 mA cm−2, Voc = 0.75 V, FF = 0.40) significantly higher than that of the lignite counter electrode (η = 0.20%, Jsc = 3.16 mA cm−2, Voc = 0.72 V, FF = 0.09). This indicates that low-medium temperature pyrolysis and composition with Ni are an effective method to improve the photovoltaic performance of lignite-based counter electrode materials.Graphical abstractThe lignite-based Ni/C composite was synthesized and applied in counter electrode for DSSCs.

Investigation on microstructure evolution and corrosion resistance of CeO2 particle reforcemented Aluminum matrix composites by powder metallurgy

Aluminum matrix composites reinforced by cerium oxide particles with different contents (0, 5%, 10%, 15% and 20%) were prepared by powder metallurgy. The morphology and structure of the composites were characterized by X-ray diffraction and scanning electron microscope. The corrosion behavior of CeO2 particle reinforced aluminum matrix composites with different content in 3.5% NaCl solution was tested by Tafel polarization curve. The results show that CeO2 is evenly distributed in the matrix, and the addition of CeO2 can effectively reduce the corrosion rate and improve the corrosion performance.

Preparation of self-healing epoxy resin coatings based on dynamic disulfide bonds

Defects and mechanical damage that lead to peeling, corrosion and other potential hazards during practical applications are inevitable in epoxy coatings due to the high cross-link density of the epoxy network. Herein, the authors synthesized a self-healing polythiourethane (SPTU) material containing dynamic disulfide bonds for the design and preparation of an SPTU–epoxy coating. Fourier transform infrared spectroscopy, proton (1H) nuclear magnetic resonance spectroscopy and scanning electron microscopy showed that 2-hydroxyethyl disulfide was successfully introduced into the polythiourethane system. Due to the fracture and reattachment of double sulfur bonds, the 3% SPTU–epoxy coating exhibited good self-healing properties in scratch treatment, the scratch being repaired completely after 2 h at 85°C. Meanwhile, 75.7% of the tensile performance of the completely fractured 3% SPTU–epoxy sample was retained after self-healing. The Tafel polarization curve and electrochemical impedance spectroscopy results showed that the 3% SPTU–epoxy coating had excellent corrosion resistance and still provided considerable corrosion resistance after 19 days of immersion corrosion tests. The self-healing coating exhibited good self-healing ability under heating conditions, which is attributed to the bond breaking and reconnection of dynamic bonds provided by the self-healing component. The self-healing properties and corrosion resistance of the prepared coating effectively improve the service life of the epoxy coating and provide some guidance for corrosion protection of epoxy coatings.

Study on preparation and anticorrosive performance of a new high hydrophobic anticorrosive coating

AbstractWater‐based anticorrosive coatings have poor water resistance, which easily lead to coating deterioration and metal corrosion. In order to improve the anticorrosion performance of waterborne coating, herein, the polytetrafluoroethylene/dimethyl siloxane/epoxy resin (PTFE/PDMS/EP) hydrophobic anticorrosive coating was prepared by layer‐by‐layer construction. The spatial structure and microscopic morphology of the hydrophobic coating were analyzed by XRD, FTIR, and SEM. The hydrophobicity and corrosion resistance of the composite coating were analyzed by hydrophobicity test, electrochemical polarization curve, hydrophobicity and corrosion resistance test of the mixed layer, Tafel polarization curves, and AC impedance spectrum. The results showed that the water contact angle of PTFE/PDMS/EP coating reached 141° and the protection efficiency of PTFE/PDMS/EP coating was 98.62%. After soaking for 7 days, the corrosion process still stays at the initial stage, which was mainly due to the good sealing and barrier properties and high anticorrosion efficiency of PTFE/PDMS/EP coating. The coating has high corrosion protection efficiency and long service life, which is of great significance to metal corrosion protection in harsh marine environments.

Corrosion inhibition of SS 316L by organic compounds: Experimental, molecular dynamics, and conceptualization of molecules–surface bonding in H2SO4 solution

The corrosion of austenitic stainless steel 316L in 1.0 M sulfuric acid must be investigated and scrutinised using five benzoic acid derivatives [C1(Benzoic acid). This research was performed using potentiodynamic polarization techniques, such as Tafel polarisation curves, electrochemical impedance spectroscopy, and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, and contact angle technique. The Tafel curves indicated that all the five compounds acted as anodic corrosion inhibitors without changing the hydrogen mechanism. The best corrosion inhibition efficiency values of steel were 80.47 %, 83.23 %, 83.96 %, 88.08 %, 92.26 % at 1 mM of the C1, C2, C3, C4, and C5, respectively. The corrosion rate of SS decreased as the inhibitor concentration was increased. The Langmuir adsorption isotherm was used to determine that these compounds are adsorbed on the surface of 316L SS.The activation parameters were also evaluated. In this research, Molecular Dynamic (MD), density functional theory (DFT) computation, and Monte Carlo (MC)simulations were used to examine the relative effect of the number of active sites, oxygen atoms, contained in each inhibitor on the iron surface Fe(110). The results obtained from the theoretical studies showed an excellent correlation with the experimental investigation.