Study Of Corrosion Inhibition Research Articles

Corrosion Inhibition Studies on Steel tools by Some Surfactants In Drill-mud Environment of Oil Wells

Corrosion Inhibition Studies on Steel tools by Some Surfactants In Drill-mud Environment of Oil Wells

Comparative studies on the corrosion inhibition efficacy of ethanolic extracts of date palm leaves and seeds on carbon steel corrosion in 15% HCl solution

The work reports on the study carried out to comparatively assess the corrosion inhibition efficacy of crude ethanolic extracts of date palm leaves and seeds on X60 carbon steel corrosion in 15% HCl solution at 25–60 °C. The corrosion inhibition studies was carried out using weight loss and electrochemical (potentiodynamic polarization and linear polarization resistance) techniques. Preliminary phytochemical screening was performed in order to determine the phytoconstituents present in the crude extracts. The influence of extractive solvents on the corrosion inhibition performance of the extracts was also investigated. It is found that the crude extracts of both date palm leaves and seeds contain saponins, flavonoids, cardiac glycosides and reducing sugars. Tannins is only present in the leaves and absent in the seeds while anthraquinones is absent in both extracts. The crude ethanolic extracts inhibited the corrosion of X60 steel in the aggressive 15% HCl solution with the leaves extract showing superior performance. Inhibition efficiency increased with increase in concentration of the extracts and temperature. Potentiodynamic polarization results reveal that the extracts function as mixed type inhibitors. Corrosion inhibition occurs by virtue of adsorption of components of the extract on the steel surface and was found to follow Langmuir adsorption isotherm model. On the influence of the extractive solvents on the corrosion inhibition performance, the order of inhibition efficiency at 60 °C follows the trend DPLAE (73.6%) > DPLEE (62.5%) > DPSAE (59.9%) > DPSEE (55.9%) with the optimum extract concentration (2000 ppm) studied.

N-cetyl-N,N,N trimethyl ammonium bromide (CTAB)-stabilized polyaniline: a corrosion inhibitor for mild steel

PurposeThe purpose of this study is to compare the inhibitive effect of polyaniline (PAni) and N-cetyl-N,N,N trimethyl ammonium bromide (CTAB)-stabilized PAni in a hydrochloric acid (HCl) medium.Design/methodology/approachPAni has been deposited potentiodynamically on mild steel in the presence of CTAB as a stabilizing agent to achieve high corrosion inhibition performance by the polymer deposition. The corrosion inhibition studies of CTAB-stabilized PAni inhibitor in 0.1 M HCl acidic solution was carried out by electrochemical methods, namely, open-circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy technique.FindingsThe results of electrochemical studies have shown that the CTAB-stabilized PAni inhibitor has higher corrosion efficiency than PAni on mild steel in 0.1 M HCl solution. The maximum per cent efficiency evaluated using the potentiodynamic polarization method is approximately 91.9.Originality/valueCTAB-stabilized PAni has never been studied as a corrosion inhibitor for mild steel in an acidic medium. The investigations demonstrate relatively the better corrosion inhibition efficiency and high dispersion of the polymer in the acidic medium.

Study of Synthesis and Corrosion Inhibition of Novel Mannich and Schiff Bases on Carbon Steel in Acid Solution

In this paper, a Schiff base (SB-1) and derivatives (SB-2 and SB-3) was synthesized and characterized by IR and 1H NMR methods, the corrosion efficiency and mechanism of carbon steel in 1: 1 hydrochloric acid was obtained by weight loss measurements, atomic absorption spectrophotometry, electrochemical measurements, atomic force microscopy studies and quantum chemical calculations. The results indicated that the inhibition efficiency was SB-3 > SB-2 > SB-1 at low concentration of inhibitors. Under high concentration, they have same efficiency. The electrochemical measurements showed that the synthesized compounds is an efficient mix-type inhibitors and its efficiency increased with the increase in inhibitor concentrations. The quantum chemical parameters were calculated using the density functional theory (DFT), and results showed that the inhibitor and the metal surface interacted with the donor-acceptor to achieve the effect of corrosion inhibition.

Study of Polyaspartic Acid and Chitosan Complex Corrosion Inhibition and Mechanisms

Study of Polyaspartic Acid and Chitosan Complex Corrosion Inhibition and Mechanisms

Study of Corrosion Inhibition of Mild Steel in In 0.01m H2SO4 by Corrosion Inhibitors:A Comparative Study

Study of Corrosion Inhibition of Mild Steel in In 0.01m H2SO4 by Corrosion Inhibitors:A Comparative Study

Corrosion Inhibition Study of Dodecylamine as long Chain Amine Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Solution

Corrosion Inhibition Study of Dodecylamine as long Chain Amine Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Solution

Pullulan as a potent green inhibitor for corrosion mitigation of aluminum composite: Electrochemical and surface studies

This work emphasizes the corrosion inhibition ability of pullulan, an environmentally benign fungal polysaccharide on acid corrosion of 6061Aluminum-15%(v) SiC(P) composite material (Al-CM). The electrochemical measurements such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) studies were carried out for the corrosion inhibition studies. Conditions were optimized to obtain maximum inhibition efficiency, by performing the experiment at varying concentrations of inhibitor, in the temperature range of 308K- 323K. Surface morphology studies were done to reaffirm the adsorption of inhibitor on the surface of composite material. Pullulan acted as mixed type of inhibitor with a maximum efficiency of 89% at 303K for the addition of 1.0 gL−1 of inhibitor. Evaluation of kinetic and thermodynamic parameters revealed that inhibitor underwent physical adsorption onto the surface of Al-CM and obeyed Freundlich adsorption isotherm. The surface characterization like SEM-EDX, AFM confirmed the adsorption of pullulan molecule. Pullulan can be considered as effective, eco friendly green inhibitor for the corrosion control of Al-CM.

Kinetic, Thermodynamic and Adsorption Studies for Corrosion Inhibition of Carbon Steel by Asparagaeus Setaceus L. + Mn2+ in Neutral Media

Kinetic, Thermodynamic and Adsorption Studies for Corrosion Inhibition of Carbon Steel by Asparagaeus Setaceus L. + Mn2+ in Neutral Media

Optimization and Electrochemical Study on the Control of Mild Steel Corrosion in Hydrochloric Acid Solution with Bitter Kola Leaf Extract as Inhibitor

Response surface methodology was applied to predict the optimum control of mild steel corrosion in acid medium with bitter kola leaf extract as inhibitor. The experiment was carried out to investigate the mutual interactions between the considered independent variables and the expected responses. Thermometric, gravimetric, potentiodynamics polarization and electrochemical impedance spectroscopy were used in the corrosion inhibition study. As a supplementary technique, infrared spectroscopy was used to analyze the pure extract and corrosion products and it was observed that some peaks shifted while some disappeared. Inhibition efficiencies of 88.24 %, 86.81 %, 90 %, 89.5 % and 85.3 % were obtained from optimization, thermometric, gravimetric, potentiodynamics polarization and electrochemical impedance spectroscopic techniques, respectively. The bitter kola leaf extract behaved as a mixed-mode inhibitor. Application of response surface methodology in this study was found to be good in predicting the optimum range for controlling of metal corrosion thereby reducing the number of experimental runs. Keywords: Acid, bitter kola leaf, Fourier transform infrared, mild steel, electrochemical impedance spectroscopy, potentio dynamics polarization

Gravimetric and Electrochemical Study of Temperature Effect of PVA Grafted Terpolymer on Corrosion Inhibition of Mild Steel in Hydrochloric Acid

A study was carried out to find the temperature effect on inhibition of mild steel dissolution using an acryl terpolymer: polyvinyl alcohol-g-poly(acrylic acid-vinyl sulfonate) in 1 M HCl. The corrosion inhibition studies were carried out at five different temperatures (303 K- 343 K) by AC and DC polarization method. In order to gain a detailed insight on the nature of adsorption of the terpolymer, several isotherms were fitted and the adsorption characteristics were approximated using Temkin isotherm using the surface coverage values obtained from weight loss and electrochemical method. Thermodynamic parameters of adsorption such as equilibrium constant, Gibb’s free energy, adsorption heat and adsorption entropy were evaluated and discussed. The surface morphology of the mild steel before and after the adsorption of the inhibitors was confirmed by Atomic Force Microscopy. Various parameters that determine the kinetics of mild steel dissolution such as activation energy, enthalpy and entropy were also calculated.

Comparative Study of Corrosion Inhibition in Acidic and Neutral Chloride Media by Some Amino Acids

Comparative Study of Corrosion Inhibition in Acidic and Neutral Chloride Media by Some Amino Acids

Synthesis, characterization and corrosion inhibition studies of N-phenyl-benzamides on the acidic corrosion of mild steel: Experimental and computational studies

Present study aims to demonstrate the effect of electron withdrawing nitro (NO2) and electron releasing methoxy (OCH3) substituents on the inhibition behavior of N-Phenyl-benzamide derivatives (BNAs), namely N-(4-nitrophenyl) benzamide (BNA-1; NO2), N-phenylbenzamide (BNA-2; H) and N-(4-methoxyphenyl)benzamide (BNA-3; OCH3) for mild steel acidic (1M HCl) corrosion. Results of the computational and experimental studies showed that methoxy (OCH3) substituent enhances the inhibition efficiency whereas nitro (NO2) decreases the inhibition efficiency. Electrochemical impedance spectroscope (EIS) study showed that BNAs acted as interface corrosion inhibitors and polarization study shows they acted as cathodic type corrosion inhibitors. They showed maximum efficiencies of 89.56%, 93.91% and 96.52% for BNA-1, BNA-2 and BNA-3, respectively. The BNAs strongly (high Kads values) and spontaneously (negative ∆G0 values) adsorbed at metal/electrolyte interfaces and their mode of adsorption obeyed the Langmuir adsorption isotherm. Surface investigation of the mild steel surfaces using AFM and SEM analyses revealed that BNAs adsorb on the surface and increase the energy barrier for corrosive dissolution which is also supported by the higher values of Ea (activation energy). DFT study carried out using 3-21G, 6-31G and 6-311G basis sets provides significant support to the experimental efficiency order. DFT indices like EHOMO, ELUMO, electronegativity (χ), softness (σ), hardness (η), dipole moment (μ), energy band gap (∆E) and fraction of electron transfer (∆N) were derived for all basis sets. Experimental and DFT study was further supported by molecular dynamic (MD) simulations study.

Zinc Oxide Nanocomposites of Selected Polymers: Synthesis, Characterization, and Corrosion Inhibition Studies on Mild Steel in HCl Solution.

Nanocomposites of ZnO and some selected polymers, namely, poly(ethylene glycol), poly(vinylpyrrolidone), and polyacrylonitrile, were synthesized and characterized using Fourier transform infrared (FTIR) spectroscopy, ultraviolet–visible (UV–vis) spectroscopy, thermogravimetric analysis (TGA), and transmission electron microscopy (TEM) techniques. The FTIR and UV–vis spectra confirmed the successful formation of the polymer nanocomposites. TGA results revealed that the synthesized polymer nanocomposites are more thermally stable than the polymers alone. ZnO nanoparticles were about 50–75 nm in size, assumed a rodlike shape, and got embedded in the polymer matrices, as revealed by TEM images. Corrosion inhibition potentials of the synthesized ZnO/polymer nanocomposites were investigated for mild steel in 5% HCl solution using potentiodynamic polarization (PDP), linear polarization resistance, and electrochemical impedance spectroscopy measurements. The results showed that each ZnO/polymer nanocomposite inhibits mild steel corrosion in 5% HCl solution better than the respective polymer alone. The nanocomposites, according to PDP studies, behaved as a mixed-type inhibitor. The predominant mode of adsorption of the nanocomposites to a mild steel surface was found to be mixed type, and the adsorption process obeys the Langmuir adsorption isotherm model. Scanning electron microscopy images also revealed the protective attributes of the ZnO/polymer nanocomposites for mild steel in 5% HCl solution.

Experimental and MDS studies of corrosion inhibition of carbon steel by saccharinate sodium

This work describes the successful performance of saccharinate molecule as an ecological corrosion inhibitor for carbon steel in 3% NaCl solution. A combination of experimental results such as (XPS, Raman, OCP, EIS, and potentiodynamic polarization) and other theoretical (DFT and molecular dynamic simulation) show that saccharinate ions provide very acceptable protection against corrosion of carbon steel. The behavior of carbon steel in the presence of different concentrations of saccharinate shows the high protective effect of this inhibitor against the corrosion of steel. These inhibitors act as mixed inhibitors with a stronger effect on the anodic side.

Electrosynthesis, Characterization and Corrosion Inhibition Study of DBSA-doped Polyaniline Coating on 310 Stainless Steel

The synthesis of polyaniline doped with dodecylbenzene sulphonic acid (Pani-DBSA) coatings on 310 stainless steel (310 SS) surfaces has been investigated by using the galvanostatic method. The synthesized coatings were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), UV-Visible absorption spectrometry and Scanning Electron Microscopy (SEM).The anticorrosion performances of Pani-DBSA coatings were investigated in 5% NaCl solution by the potentiodynamic polarization technique and Electrochemical Impedance Spectroscopy (EIS). The corrosion rate of Pani-DBSA coated 310 SS was found ∼30 times lower than bare 310 SSand potential corrosion increased from -0.84 V versus Ag/AgCl for uncoated 310 SS to -0.71 V versus Ag/AgCl for Pani-DBSA coated 310 SS electrodes. Electrochemical measurements indicate that Pani-DBSA coated have good inhibiting properties with a mean efficiency of ~96% at 5 mA cm-2 current density applied to 310 SS corrosion in chloride media. The results of this study clearly ascertain that the Pani-DBSA has an outstanding potential to protect 310 SS against corrosion in a chloride environment.

Corrosion Inhibition of Mg Alloy AZ31 By Selenite (SeO32-)

The study of Mg corrosion inhibition by selenium/selenite is very limited. The first relevant work was done by Guy and Whitby in the 1930s1. That work used an acidic selenite-based coating bath to convert Mg alloy surfaces for increased corrosion resistance. It was found that the selenite can react on Mg alloys surfaces to form a protective film. After that report, there was no work reported until Kaminski showed evidence of corrosion inhibition in free corrosion exposure experiments2. The present study follows the work of Kaminski and develops a more comprehensive characterization of Mg corrosion inhibition by selenite using electrochemical and surface analytical methods. Results from these studies support the distinctive qualities of Se films and provide insights on the corrosion inhibition mechanism and inform technological approaches for using this corrosion inhibitor in practical applications. Corrosion inhibition was characterized using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) at three different concentrations of Na2SeO3, which ranged from 1 mM to 50 mM in a base solution of aerated 0.1 M NaCl. After 8 hours immersion in NaCl/inhibitor solution, anodic polarization showed that at low inhibitor concentration the corrosion current density was decreased to less than 10-6 A/cm2. EIS indicated that a low concentration of sodium selenite provided better corrosion protection, as evidenced by an increase in polarization resistance. During these characterizations, a black or red film formed on substrates after immersion tests. A red film was observed at high selenite concentrations, and some trapped transparent crystals were also noted. Several repeat experiments indicated that after three days immersion, nearly all samples were free of obvious corrosion defects. Raman spectroscopy was employed to analyze the surface chemistry. Amorphous selenium tended to form at low inhibitor concentrations, and the film formed was black. Crystallized selenium only formed at high inhibitor concentrations, and the film formed was red. Transparent insoluble crystals were trapped in the red film. Raman spectroscopy showed that these crystals were insoluble MgSeO3. Overall, the corrosion inhibition by selenite is better than that conferred by vandate, but not as good as that conferred by chromate under similar experimental conditions. Among the various film morphologies observed, the amorphous black film provided better corrosion protection than the crystallized red film, as evidenced by electrochemical testing results. In this presentation, details from electrochemical characterization and surface analysis will be discussed in the context of corrosion protection mechanism and prospects for use in a technological application.

A comparative study of corrosion inhibition of steel and stainless steel in hydrochloric acid by N,N,N′,N′-tetramethyl-p-phenylenediamine

The corrosion of mild steel (MS) and AISI type 321 stainless steel (AISI 321) in 1 M HCl solution and the inhibitive mechanism of N,N,N′,N′-Tetramethyl-p-phenylenediamine (TMPPD) were investigated using open circuit potential measurements (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Potential-time measurements showed that the addition of TMPPD to HCl solutions shifts the potential of MS and AISI 321 to more positive values. Polarization curves measurements indicated that TMPPD act as a mixed type inhibitor for the corrosion of MS and AISI 321 in HCl solutions. EIS measurements showed that the dissolution process occurs under activation control. The applied techniques explained that TMPPD is more efficient as a corrosion inhibitor for mild steel than stainless steel in acidic solutions. Theoretical fitting of different isotherms, Langmuir, Kinetic-thermodynamic, Flory–Huggins, and Temkin isotherms were tested to explain the nature of TMPPD adsorption. The associated activation parameters were also calculated and discussed.

Ca2+-exchange in layered zirconium orthophosphate, α-ZrP: Chemical study and potential application for zinc corrosion inhibition

The control of the corrosion phenomenon occurring at the metal interface requires the development of new non-toxic anticorrosion additives. For this purpose, zirconium orthophosphate compounds (Zr(HPO4)2,H2O noted α-ZrP) were synthesized by both hydrothermal and refluxing methods The Ca2+-cationic exchange in the layered structure is kinetically favoured by low crystallinity of α-ZrP synthesized by refluxing process, and leads to the formation of CaZr(PO4)2,4H2O, noted Ca2+-ZrP. The H+/Ca2+ exchange mechanism is mainly triggered by acid-base considerations, and especially the pKa of α-ZrP/Ca2+-ZrP acid-base couple (evaluated to 2.5). Both compounds are acidic compounds by internal exchangeable H+ for α-ZrP and surface protons for Ca2+-ZrP, and can be used as potential inhibitors of zinc corrosion. Electrochemical measurements show that Ca2+-ZrP compounds dispersed in the NaCl electrolyte buffer the pH value over a long time and therefore allow controlling the corrosion rate of zinc.

Study of corrosion inhibition of C38 steel in 1\xa0M HCl solution by polyethyleneiminemethylene phosphonic acid

A new class of corrosion inhibitors, namely, polyethyleneiminemethylene phosphonic acid (PEIMPA), was synthesized and its inhibiting action on the corrosion of C38 steel in 1 M HCl at 30 °C was investigated by various corrosion monitoring techniques such as weight loss measurements, potentiodynamic polarization, linear polarization resistance (Rp), and surface analysis (SEM and EDX) which are used to characterize the steel surface. Weight loss measurements revealed that the presence of PEIMPA increases the inhibition efficiency by decreasing the corrosion rate. Tafel polarization study showed that the inhibitor acts as a mixed-type inhibitor. Adsorption of PEIMPA on the carbon steel surface was found to obey the Langmuir isotherm. Some thermodynamic functions of dissolution and adsorption processes were also determined and discussed. The SEM results showed the formation of protective film on the mild steel surface in the presence of PEIMPA. The results obtained from different tested techniques were in good agreement.