Advanced self-healing coatings based on ZnO, TiO2, and ZnO-TiO2/polyvinyl chloride nanocomposite systems for corrosion protection of carbon steel in acidic solutions containing chloride

Polarization and electrochemical impedance spectroscopy (EIS) were employed for investigating the behavior of clemastine drug on the corrosion protection of carbon steel in 0.5 M H2SO4 solution which was enhanced by increasing the clemastine concentration in acid solution. As evidenced by polarization data, clemastine behaved as a mixed-type inhibitor and retards both anodic and cathodic processes. Adsorption of clemastine on carbon steel in acid solution obeyed the Langmuir adsorption isotherm. A reasonable correlation was observed between the ∆Goads values obtained from EIS and potentiodynamic polarization measurements. The calculated ∆Goads values of clemastine confirmed comprehensive adsorption that is a combination of physical and chemical adsorption. The electronic properties of clemastine were calculated via density functional theory (DFT) approach to establish the relationship between the inhibitive effect and molecular structure of the clemastine. According to the obtained quantum chemical parameters, clemastine showed higher EHOMO, lower EHOMO, lower energy gap, and higher dipole moment than some inhibitors earlier reported as good corrosion inhibitors.

Alizarin yellow GG (AYGG) is a natural dye used as a corrosion inhibitor. The inhibitive action of this compound against corrosion of carbon steel in hydrochloric acid solution (1M concentration), has been tested using the weight loss measurements and electrochemical measurements techniques. The results indicates this compound is a good inhibitor for carbon steel in hydrochloric acid solution, and the inhibition efficiency increased as the concentration of this compound increased. Also the results revealed as the temperature increased, efficiency and corrosion activation energies are increased. On the basis of the experimentally determined activation energy values, the addition of this compound can be considered chemisorption adsorbed.

Many naturally-derived organic coating has been proposed for corrosion protection of carbon steel, but its effectiveness is challenged by poor coating adhesion. In this work, chitosan was extracted from Nila tilapia fish scales and coated onto ASTM A36 carbon steel surface by using electrophoretic deposition (EPD) and dip coating (DC) techniques. The work aims at determining the coating technique and process parameters that result in effective corrosion protection of carbon steel in acid solution. The effectiveness of corrosion protection was determined by calculating inhibition efficiency from corrosion parameters obtained by polarization test and electrochemical impedance spectroscopy. Results showed that each coating technique provides different mechanism of corrosion protection. The DC-made coating showed a physisorption mechanism where the steel's corrosion rate increases as the temperature increased. The EPD-coated specimens demonstrated a chemisorption mechanism with its minor change in corrosion rates than those of DC-coated specimens. The DC technique resulted in a higher inhibition (73 %) efficiency and lower corrosion rate than that of EPD (41 %) with some degree of stability over increasing temperature.

In this paper, aqueous extracts of mango and orange peels were shown to be good corrosion inhibitors for carbon steel in a 1 mol L - 1 HCl solution. The inhibition efficiency increased as the extract concentration increased over a concentration range of 200-600 mg L - 1, varying from 79 to 96% (mango) and 84 to 91% (orange) using Tafel plots and from 69 to 94% (mango) and 76 to 90% (orange) using electrochemical impedance. In the presence of 400 mg L - 1 of mango and orange peel extracts, the weight loss measurements showed an increase in the inhibition efficiency with immersion time, where the best results after 24 h of immersion were 97% and 95%, respectively. The adsorption of the extract components on the surface of the carbon steel follows the Langmuir adsorption isotherm. With the extraction procedure used in this work, it can be surmised that it is likely that the more polar heterosides in the extracts are responsible for the corrosion inhibition of carbon steel in an acid solution.

Sunflower-head extract as a sustainable and eco-friendly corrosion inhibitor for carbon steel in hydrochloric acid and sulfuric acid solutions

Theeffect of 6-[5-(4-methoxyphenyl) furan-2-yl] nicotinonitrile (MA-1160) as a new corrosion inhibitor for carbon steel (CS) in hydrochloric acid (HCl) solution was investigated using weight loss (WL), atomic absorption spectroscopy (AAS) and electrochemical measurements. The surface morphology of CS was tested using: scanning electron microscopy, atomic force microscope, attenuated total reflection–Fourier transform infra-red and ultraviolet–visible spectroscopy methods. The adsorption of MA-1160 on CS surface obeyed the model of Langmuir isotherm. Polarization data revealed that this inhibitor behave as mixed-type inhibitor. The spectroscopic measurements revealed the formation of a protective adsorbed layer on CS surface. Quantum chemical calculations were calculated and discussed using density functional theory method. The inhibition efficiency (% €) was 84% in WL, 86.4% in AAS, 86.0% in potentiodynamic polarization and 84.8% in EIS 86% at 21 µM. Thus, all the test methods gave good agreement with each other in % €.

The inhibitory effect of 1-hexadecyl-2,3-dimethylimidazolehexafluorophosphate([C16DMIM]+[PF6]−) on carbon steel was investigated in both 1 M hydrochloric acid(HCl) and 1 M sulfuric acid (H2SO4) solutions.The thermodynamic and kinetic corrosion parameters were calculatedthrough weight loss and electrochemical measurements. The resultsshowed that the addition of 0.05 mmol/L [C16DMIM]+[PF6]− resulted in an inhibition efficiencyof 98.28% and 80.10% in 1 M HCl and 1 M H2SO4 at 363 K, respectively. The adsorption of [C16DMIM]+[PF6]− obeyed the Langmuir adsorptionisotherm, presenting a competition between physical and chemical interactionsin the H2SO4 solution, while it was chemisorptionin the HCl solution. Surface analysis techniques (SEM) demonstratedthat the inhibitor could form a protective film on the carbon steelsurface. Molecular dynamics simulations were utilized to determinethe interaction of the [C16DMIM]+[PF6]− molecule with H2SO4 andHCl on the Fe(110) surface, and the adsorption energies of the inhibitorin both acid solutions were determined. The simulation results werein close agreement with the experimental results, and due to the adsorptionenergy in the HCl solution, the inhibition efficiency of the HCl solutionwas superior to that in the H2SO4 solution.These results demonstrate that [C16DMIM]+[PF6]− can be a sustainable, less hazardouscorrosion inhibitor for carbon steel in acid solutions.

Synergistic adsorption mechanism of pulsatilla chinensis root extract as an eco-friendly corrosion inhibitor for carbon steel in acidic solution.

Bi-layered composites of polydimethylaniline (PDMA) and polypyrrole (PPY) were investigated for corrosion protection of carbon steel. In this work, PNDMA, PPY and PNDMA-AOT/ PPY coatings have been electropolymerization on carbon steel by potentiodynamic and galvanostatic synthesis techniques from aqueous solutions 0.1 M dimethylaniline, 0.1M pyrrole, 0.05 M sodium dioctyl sulfosuccinate (AOT) and 0.3 M oxalic acid. In order to include dioctyl sulfosuccinate ions as dopant in the dimethylaniline, AOT was also added to the polymerization solution of dimethylaniline. Characterization of monolayer and bilayer polymer coatings was carried out by cyclic voltammetry, Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) techniques. Corrosion behaviour of PDMA-AOT/PPY coated carbon steel was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques in 0.5M H2SO4solutions. The results of the corrosion tests showed that PDMA-AOT/PPYI coatings ensure good corrosion protection of carbon steel in aggressive media. Bilayer coatings revealed better corrosion inhibition efficiencies than monolayer coatings A.M.Fenelon, C.B.Breslin, Corros.Sci., 2003,45, 2837P Herrasti, A.I.del Rio, J.Recio, Electrochim.Acta, 2007, 52, 6496.A. Yagan, N.O. Pekmez, A. Yildiz, Prog. Org. Coat., 2006, 57, 314A. Yagan, N.O. Pekmez, A. Yildiz, Electrochim. Acta, 2008, 53, 2474K. Shah, J. Iroh, Synthetic Met., 2002, 132, 35.M. Kraljic, Z. Mandic, L.J. Duic, Corros. Sci., 2003, 45, 181.G. de T. Andrade, M.J. Aguirre, S.R. Biaggio, Electrochim. Acta, 1998, 44, 633. R.Hasanov, S.Bilgic, Progress in organic coatings, 2009, 64, 435-445.B.Zeybek, N.O.Pekmez and E.Kilic, Electrochim Acta, 2011, 56, 9277-9286.J.F. Rusling, S.L. Suib, Adv. Mater., 1994, 6, 922F. Branzoi V. Branzoi and A. Prunã, Revue Roumaine de Chimie, 2012, 57 , 49-55.V. Branzoi,F. Branzoi, L. Pilan, Materials Chemistry and Physics 2009, 118, 197-203.F. Branzoi,V. Branzoi, A. Musina, Surface and Interface Analysis, 2012, 44, 1076-1081

The inhibition effect of ylang-ylang oil ( YYO ) and their adsorption on carbon steel surface in hydrochloric acid was realized at temperatures varying between 308 and 338 K by weight loss, EIS, and potentiodynamic polarization techniques. The tested compound showed inhibition efficiency that is superior 87 % for a concentration equal to 1.0 g/L. Polarization measurements indicate that the examined oil act as a mixed inhibitor with predominant anodic effectiveness and the protection efficiency increases with inhibitor concentration but this effect decreased with increasing of temperature. Data obtained from EIS studies were analyzed to model inhibition process through appropriate equivalent circuit models. The adsorption of YYO on carbon steel surface obeys Langmuir adsorption isotherm in acid medium and the activation were determined and discussed.

The inhibiting effects of 2,6‐ionen and 2,10‐ionen type polyvinylbenzyltrimethylammonium chloride, and latex, on low carbon steel in hydrochloric acid solution was investigated by potentiodynamic polarisation measurements and impedance measurement techniques over the temperature range of 20‐60°C at different inhibitor concentrations. It was found that the inhibition efficiencies increased with increasing inhibitor concentration. The degree of shift in Ecorr values, together with the change in anodic and cathodic Tafel slopes (βa, βc), revealed that the studied inhibitors behaved as anodic inhibitors. Thermodynamic and kinetic parameters for dissolution and adsorption were also calculated.

Nanomaterials coatings were developed for corrosion protection of carbon steel. Barium titanate (BaTiO3) possesses a distinctive layered structure that can be effectively utilized to enhance the resistance to corrosion in industrial coating systems. Homogeneous Barium titanate films were deposited successfully by electrophoretic deposition (EPD) using an aqueous suspension under altering deposition time. An investigation was conducted using electrochemical measurements to determine the impact of a Barium titanate BaTiO3 coating on the corrosion resistance of carbon steel. Deposited layers characterizations such as adhesion and wettability have been investigated. X-ray Diffraction (XRD), a field emission scanning electron microscope (FE-SEM), and Energy Dispersive Spectroscopy (EDX) confirmed the successful incorporation of the composites in the coating. The corrosion protection properties of the prepared coatings were evaluated using OCP, Tafel, and Cyclic Voltammetry (CV) measurements. The surface morphology of the coatings after corrosion was studied using Field Emission Scanning Electron Microscopy (FESEM). The scanning electron microscope (SEM) analysis of the deposited thin film shows that the film is adhered, dense, and free of voids. This characteristic allows the coated carbon steel to have a high corrosion resistance.

Evaluating the anticorrosive properties of <i>Camellia chrysantha</i> flower extract on carbon steel in acidic solutions: A computational approach

Insight into interfacial adsorption and inhibition mechanism of Aconitum carmichaelii Debx extract as high-efficient corrosion inhibitor for carbon steel in acidic solution

Effect of H 2S on the CO 2 corrosion of carbon steel in acidic solutions