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Zhang C.,Beijing University of Chemical Technology | Zhao J.-M.,Beijing University of Chemical Technology | Zhao J.-M.,Beijing Key Laboratory of Electrochemical Process and Technology for Materials
Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica | Year: 2014

The synergistic inhibition effect of the imidazoline ammonium salt (IAS) and sodium dodecyl sulfate (SDSH) on the corrosion of Q235 carbon steel in a CO2 saturated brine solution was studied by weight loss, electrochemical impedance spectroscopy (EIS), Tafel polarization measurements, X-ray photoelectron spectrometry (XPS), and scanning electron microscopy (SEM). We found that in the CO2 saturated brine solution, a good synergistic inhibition effect exists between IAS and low concentrations of SDSH, and the most significant synergistic inhibition occurred at a concentration ratio of 1:1 (50 mg.L-1: 50 mg.L- 1) with an inhibition efficiency of 88.5%. However, antagonism occurs upon mixing IAS with a high concentration of SDSH. In this paper, the mechanisms of the synergistic and antagonistic effects are analyzed using a reasonable adsorption model. Good corrosion inhibition on Q235 carbon steel was also found when only using a high concentration of SDSH with an inhibition efficiency of about 90%. Both the adsorption processes of SDSH and IAS on the surface of Q235 carbon steel are spontaneous processes and the former process complies with the Frumkin adsorption model while the later complies with the Temkin adsorption model. © Editorial office of Acta Physico-Chimica Sinica.


Zhao J.,Beijing University of Chemical Technology | Zhao J.,Beijing Key Laboratory of Electrochemical Process and Technology for Materials | Duan H.,Beijing University of Chemical Technology | Jiang R.,Beijing University of Chemical Technology | Jiang R.,Beijing Key Laboratory of Electrochemical Process and Technology for Materials
International Journal of Electrochemical Science | Year: 2015

The synergistic inhibition effects of the coptis extract (CP)/berberine (BB) and thiourea (TU) on the corrosion of mild steel in 3% NaCl solution saturated with CO2 at 60°C was investigated by potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) methods. CP and BB act as moderate inhibitors, and inhibition efficiency of the former is higher than that of the latter. The adsorption of them obeys Langmuir adsorption isotherm. The inhibition performance was significantly improved by the combined use of them with TU, and obvious synergistic corrosion inhibition effect was achieved. © 2015 The Authors.


Zhao J.,Beijing University of Chemical Technology | Zhao X.,Beijing University of Chemical Technology | Jiang R.,Beijing University of Chemical Technology | Jiang R.,Beijing Key Laboratory of Electrochemical Process and Technology for Materials
Journal of the Chinese Society of Corrosion and Protection | Year: 2016

Four imidazoline derivates were synthesized using diethylenetriamine with stearic acid, oleic acid, n-docosanoic acid and erucic acid respectively as raw materials. Then the inhibition performance and adsorption capacity on the carbon steel surface and the ability of hydrophobic of the prepared derivates were studied in dynamic H2S/CO2 environment by means of dynamic weight loss test, SEM, AFM, contact angle measurement and molecular dynamics simulation. The measurememnt results for contact angle and AFM force showed that the hydrophobic effect is better and the adhesion force is bigger respectively for imidazoline derivatives with double bonds in their hydrophobic chains. The surface adsorption energy of the four imidazoline derivatives on the face of Fe (001) were calculated by using molecular dynamic simulation, the results indicated that the surface adsorption energy of imidazoline which has double bonds in hydrophobic chain was larger than that one without double bonds. The theoretical evaluation of corrosion inhibition performance of four imidazoline derivates accorded well with the experiment results. © 2015, Chinese Society of Corrosion and Protection. All rights reserved.


Tang Y.,Beijing University of Chemical Technology | Tang Y.,Beijing Key Laboratory of Electrochemical Process and Technology for Materials | Zuo Y.,Beijing University of Chemical Technology | Zuo Y.,Beijing Key Laboratory of Electrochemical Process and Technology for Materials | And 8 more authors.
Corrosion Science | Year: 2014

The metastable pitting potential for four materials, Q235 steel, X70 steel, pure iron and 316L stainless steel in chloride solutions were measured by slow scan potentiodynamic polarization. For the four materials, good linear relationship exists between the metastable pitting potential Em and pitting potential Eb. The close relationship between the two parameters is attributed to the passivity of the metals in environments, which plays the key role in both the nucleation processes of metastable pitting and stable pitting. Higher passivity results in higher average pitting potential and larger difference between average Eb and Em values. © 2013 Elsevier Ltd.


Zhao J.,Beijing University of Chemical Technology | Zhao J.,Beijing Key Laboratory of Electrochemical Process and Technology for Materials | Duan H.,Beijing University of Chemical Technology | Jiang R.,Beijing University of Chemical Technology | Jiang R.,Beijing Key Laboratory of Electrochemical Process and Technology for Materials
Corrosion Science | Year: 2015

Corrosion inhibition of a quinolinium quaternary ammonium salt and a Gemini surfactant, 1,3-bis(dodecyldimethylammonium chloride)-2-propanol, for mild steel in H2S and CO2 saturated brine solution was investigated by using polarization test, EIS and XPS. The synergistic effect is found between these two compounds when the Gemini concentration is less than 50mgL-1 in the solution containing 100mgL-1 quinolinium quaternary ammonium salt, and it disappears when the Gemini concentration is larger than 50mgL-1. The synergistic mechanism is explained by competitive adsorption of these two compounds on steel surface. © 2014 Elsevier Ltd.


Zhao J.-M.,Beijing University of Chemical Technology | Zhao J.-M.,Beijing Key Laboratory of Electrochemical Process and Technology for Materials | Gu F.,Beijing University of Chemical Technology | Zhao T.,Beijing University of Chemical Technology | And 2 more authors.
Research on Chemical Intermediates | Year: 2016

Six imidazoline derivatives with different pedant chains were synthesized using oleic acid and different amines respectively to be used as corrosion inhibitors. The hydrophobicity/hydrophilicity was discussed using contact angle and atomic force microscopy curve measurement. The inhibition performance was investigated by weight loss method and scanning electronic microscopy at different flow rates in a high-pressure CO2 environment. The results showed that the hydroxyethyl group in the pedant chain can improve the hydrophilicity of imidazoline, while amino ethylene can improve the hydrophobicity of imidazoline. Increasing the number of amino ethylene units causes a gradual increase in the hydrophobicity of imidazoline. The hydrophobic performance of imidazoline synthesized by oleic acid and polyethylenepolyamine was the strongest. The dynamic weight loss experiment showed that the inhibition ability of imidazoline derivatives was affected both by the structure of imidazoline derivatives and flow rate of fluid. Under low velocity (0.3 and 0.6 m/s), the highest inhibition efficiency was gained by the derivative with two amino ethylene units in pedant chain, while under high flow velocity (5.5 m/s), the imidazoline derivatives with multiple amino ethylene units (more than 3) ranked the highest. The inhibition efficiency of inidazoline was decreased by the introduction of hydroxyethyl group to the imidazoline ring. The inhibition behaviors were explained by hydrophobicity–hydrophilicity balance of imidazoline derivatives. © 2016 Springer Science+Business Media Dordrecht

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