The Experts below are selected from a list of 24330 Experts worldwide ranked by ideXlab platform
G S Frankel - One of the best experts on this subject based on the ideXlab platform.
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synergistic Corrosion Inhibition of aa2024 t3 by sodium silicate and sodium molybdate
ECS Electrochemistry Letters, 2014Co-Authors: O Lopezgarrity, G S FrankelAbstract:The effect of mixing sodium silicate and sodium molybdate on the Corrosion Inhibition of AA2024-T3 was investigated using various electrochemical, microscopic and spectroscopic techniques. Strong synergistic behavior was observed when silicate and molybdate were mixed together in solution resulting in much lower threshold concentrations for Corrosion Inhibition.
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Active Corrosion Inhibition of AA2024-T3 by trivalent chrome process treatment
Corrosion, 2012Co-Authors: Youguang Guo, G S FrankelAbstract:The trivalent chrome process (TCP) is one of the leading nonchromate conversion coatings and has been shown to provide excellent Corrosion protection for Al alloy substrates. The goal of this work was to assess and quantify the self-healing or active Corrosion Inhibition properties of TCP on AA2024-T3 (UNS A92024). Samples exposed in the artificial scratch cell were characterized using electrochemical impedance spectroscopy (EIS) and x-ray photoelectron spectroscopy (XPS) for assessment of various aspects of active Corrosion Inhibition. Analysis of the electrolyte exposed to the TCP surface was conducted by inductively coupled plasma-optical emission spectroscopy (ICP-OES). TCP treatment was found to greatly improve the Corrosion resistance of AA2024-T3 in corrosive environments. After exposure in dilute Harrison's solution, chromium species were detected in the exposed electrolyte, indicating that chromium is released from the TCP coating. Chromium was found on the surface of the uncoated sheets in the artificial scratch cell, which provided evidence that chromium species can be transported from a TCP coating to a nearby uncoated area as in a scratch. EIS data showed the polarization resistance of the uncoated surface exposed near a TCP surface in the artificial scratch cell was twice as much as uncoated controls, proving that TCP coating can provide active Corrosion Inhibition to a nearby uncoated Al alloy surface. © 2012, NACE International.
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mechanisms of Corrosion Inhibition of aa2024 t3 by vanadates
Corrosion Science, 2007Co-Authors: Mariano Iannuzzi, G S FrankelAbstract:Abstract The mechanisms of Corrosion Inhibition of AA2024-T3 by vanadates were studied using chronoamperometry, polarization curves and adsorption isotherms. The electrochemical behaviour of clear solutions containing metavanadates and orange solutions containing decavanadates was clearly distinctive. Metavanadates reduced the kinetics of oxygen reduction to an extent similar to chromates. Corrosion Inhibition of AA2024-T3 by metavanadates was very rapid and it might occur by the formation of an adsorbed layer. Reduction of clear metavanadate solution was very slow. Approximately 35 min were required to develop a monolayer of a reduced vanadate species. The adsorption of the inhibitor likely blocked reactive sites on intermetallic particles, discouraging the oxygen reduction reaction (ORR). Adsorption of the inhibitor on the Al matrix could also displace Cl− ions, increasing the stability of the passive film and reducing the breakdown of S-phase particles. In contrast, decavanadates were shown to be poor inhibitors of the ORR. A sharp current spike was observed after injection of decavanadates for both Cu and AA2024-T3 at various applied cathodic potentials. Integration of the current peaks suggested the formation of several monolayers of a reduced vanadate species. The formation of several monolayers was in line with the poor performance of decavanadates as inhibitors of AA2024-T3 Corrosion.
N Khalil - One of the best experts on this subject based on the ideXlab platform.
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quantum chemical approach of Corrosion Inhibition
Electrochimica Acta, 2003Co-Authors: N KhalilAbstract:An examination of quantum chemical and Corrosion Inhibition studies were made to see if any clear links exist between the two. The results of quantum chemical calculations and experimental efficiencies of inhibitors were subjected to correlation analysis. A composite index of some of the key quantum chemical parameters was constructed in order to characterize the Inhibition performance of the tested molecules.
Wang Yuan - One of the best experts on this subject based on the ideXlab platform.
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Corrosion Inhibition Performance of Quaternary Ammonium Salt of Elaeostearic Imidazoline
2020Co-Authors: Wang YuanAbstract:Quaternary ammonium salt of elacostearic imidazoline was synthesized by using elaeostearic acid,diethylenetriamine and benzyl chloride as the starting materials.The structure of the product was characterized by FITR spectrum.And its Corrosion Inhibition performance on N80 steel in HCl solution was investigated by weight loss and potentiodynamic polarization curve methods.The results show that the Corrosion of N80 steel in HCl solution was inhibited in the presence of quaternary ammonium salt of elacostearic imidazoline.The Corrosion Inhibition efficiency of the product increased with the rise of inhibitor concentration.The Corrosion rate of N80 steel increased with the rise of temperature and concentration of HCl solution,and the increase of HCl concentration did not change the Corrosion Inhibition efficiency of the inhibitor.Electrochemical results show that the quaternary ammonium salt is a mixed type inhibitor and mainly controls the cathodic reaction of N80 steel.
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Corrosion Inhibition Performance of A Elacostearic Amide in HCl Solution
Chemistry & Bioengineering, 2020Co-Authors: Wang YuanAbstract:Elacostearic acid was synthesized from tung-oil,and then a elacostearic amide was synthesized by the reaction of elacostearic acid and diethylenetriamine.The structure of the product was characterized by IR spectrum.And its Corrosion Inhibition performance on steel N80 in HCl solution was investigated by weight loss and potentiodynamic polarization curve method.Results showed that the Corrosion of steel N80 in HCl solution was inhibited in the presence of elacostearic amide.The Corrosion Inhibition efficiency of the product increased with the rise of its amount,firstly increased and then decreased with the rise of temperature,decreased with the rise of concentration of HCl solution.Electrochemical results showed that the elacostearic amide was a mixed type inhibitor which mainly controlled the cathodic reaction of steel N80.
Guannan Mu - One of the best experts on this subject based on the ideXlab platform.
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the adsorption and Corrosion Inhibition of anion surfactants on aluminium surface in hydrochloric acid
Corrosion Science, 1999Co-Authors: Tianpei Zhao, Guannan MuAbstract:The adsorption and Corrosion Inhibition of the anion surfactants such as Dodecyl Sulphonic Acid Sodium Salt (DSASS), Dodecyl Benzene Sulfonic Acid Sodium Salt (DBSASS) and Sodium Dodecyl Sulfate (SDS) on the aluminium surface in hydrochloric acid solution was studied using the weight loss method. It was found that the adsorption of surfactants could prevent aluminum from weight loss and the adsorption accorded with Langmuir equation. The thermodynamic parameters such as adsorption heat, adsorption entropy and adsorption free energy were calculated and the changes of the contact angles of aluminum sheets with and without surfactants were determined. According to the above mentioned experimental results, the relations between the adsorption and Corrosion Inhibition of the anion surfactants on aluminium surface were discussed.
F.a. Ansari - One of the best experts on this subject based on the ideXlab platform.
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Corrosion Inhibition by fatty acid triazoles for mild steel in formic acid
Journal of Applied Electrochemistry, 2003Co-Authors: M.a. Quraishi, F.a. AnsariAbstract:5-Heptadec-8-enyl-4-phenyl-4H–[1,2,4] triazole-3-thiol (HPTT), 4-phenyl-5-undecyl-4H–[1,2,4] triazole-3-thiol (PUTT), and 5-dec-9-enyl-4-phenyl-4H–[1,2,4] triazole-3-thiol (DPTT) were synthesized and their influence on the Inhibition of Corrosion of mild steel in 20% formic acid was investigated by weight loss and potentiodynamic polarization techniques. The Inhibition efficiency of these compounds was found to vary with their nature and concentration, temperature and immersion time. The values of activation energy and free energy of adsorption of the triazoles were calculated to investigate the mechanism of Corrosion Inhibition. Good Inhibition efficiency (>90%) was found even at lower concentration (i.e., 25 ppm) in acid solution. The adsorption on mild steel surfaces was found to obey Temkin's adsorption isotherm. Potentiodynamic polarization results revealed that the compounds studied are mixed type inhibitors. Electrochemical impedance spectroscopy was also used to investigate the mechanism of the Corrosion Inhibition.
