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Shiyong Zhao - One of the best experts on this subject based on the ideXlab platform.

  • impedance spectroscopic study of corrosion inhibition of copper by surfactants in the acidic solutions
    Corrosion Science, 2003
    Co-Authors: Shenhao Chen, Bingsheng Yin, Shiyong Zhao, Xiangqian Liu
    Abstract:

    The inhibitive action of the four surfactants, cetyltrimethylammonium bromide (CTAB), Sodium Dodecyl Sulfate, Sodium oleate and polyoxyethylene sorbitan monooleate (TWEEN-80), on the corrosion behavior of copper was investigated in aerated 0.5 mol dm(-3) H2SO4 solutions, by means of electrochemical impedance spectroscopy. These surfactants acted as the mixed-type inhibitors and lowered the corrosion reactions by blocking the copper surface through electrostatic adsorption or chemisorption. The inhibitor effectiveness increased with the exposure time to aggressive solutions, reached a maximum and then decreased, which implies the orientation change of adsorbed surfactant molecules on the surface. CTAB inhibited most effectively the copper corrosion among the four surfactants. The copper surface was determined to be positively charged in sulfuric acid solutions at the corrosion potential, which is unfavourable for electrostatic adsorption of cationic surfactant, CTAB. The reason why CTAB gave the highest inhibition efficiency was attributed to the synergistic effect between bromide anions and positive quaternary ammonium ions. C16H33N(CH3)(4)(+) ions may electrostatically adsorbed on the copper surface covered with primarily adsorbed bromide ions. On the basis of the variation of impedance behaviors of copper in the surfactant-containing solutions with the immersion time, the adsorption model of the surfactants on the copper surface was proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.

  • impedance spectroscopic study of corrosion inhibition of copper by surfactants in the acidic solutions
    Corrosion Science, 2003
    Co-Authors: Shenhao Chen, Shiyong Zhao
    Abstract:

    The inhibitive action of the four surfactants, cetyltrimethylammonium bromide (CTAB), Sodium Dodecyl Sulfate, Sodium oleate and polyoxyethylene sorbitan monooleate (TWEEN-80), on the corrosion behavior of copper was investigated in aerated 0.5 mol dm(-3) H2SO4 solutions, by means of electrochemical impedance spectroscopy. These surfactants acted as the mixed-type inhibitors and lowered the corrosion reactions by blocking the copper surface through electrostatic adsorption or chemisorption. The inhibitor effectiveness increased with the exposure time to aggressive solutions, reached a maximum and then decreased, which implies the orientation change of adsorbed surfactant molecules on the surface. CTAB inhibited most effectively the copper corrosion among the four surfactants. The copper surface was determined to be positively charged in sulfuric acid solutions at the corrosion potential, which is unfavourable for electrostatic adsorption of cationic surfactant, CTAB. The reason why CTAB gave the highest inhibition efficiency was attributed to the synergistic effect between bromide anions and positive quaternary ammonium ions. C16H33N(CH3)(4)(+) ions may electrostatically adsorbed on the copper surface covered with primarily adsorbed bromide ions. On the basis of the variation of impedance behaviors of copper in the surfactant-containing solutions with the immersion time, the adsorption model of the surfactants on the copper surface was proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.

Shenhao Chen - One of the best experts on this subject based on the ideXlab platform.

  • impedance spectroscopic study of corrosion inhibition of copper by surfactants in the acidic solutions
    Corrosion Science, 2003
    Co-Authors: Shenhao Chen, Bingsheng Yin, Shiyong Zhao, Xiangqian Liu
    Abstract:

    The inhibitive action of the four surfactants, cetyltrimethylammonium bromide (CTAB), Sodium Dodecyl Sulfate, Sodium oleate and polyoxyethylene sorbitan monooleate (TWEEN-80), on the corrosion behavior of copper was investigated in aerated 0.5 mol dm(-3) H2SO4 solutions, by means of electrochemical impedance spectroscopy. These surfactants acted as the mixed-type inhibitors and lowered the corrosion reactions by blocking the copper surface through electrostatic adsorption or chemisorption. The inhibitor effectiveness increased with the exposure time to aggressive solutions, reached a maximum and then decreased, which implies the orientation change of adsorbed surfactant molecules on the surface. CTAB inhibited most effectively the copper corrosion among the four surfactants. The copper surface was determined to be positively charged in sulfuric acid solutions at the corrosion potential, which is unfavourable for electrostatic adsorption of cationic surfactant, CTAB. The reason why CTAB gave the highest inhibition efficiency was attributed to the synergistic effect between bromide anions and positive quaternary ammonium ions. C16H33N(CH3)(4)(+) ions may electrostatically adsorbed on the copper surface covered with primarily adsorbed bromide ions. On the basis of the variation of impedance behaviors of copper in the surfactant-containing solutions with the immersion time, the adsorption model of the surfactants on the copper surface was proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.

  • impedance spectroscopic study of corrosion inhibition of copper by surfactants in the acidic solutions
    Corrosion Science, 2003
    Co-Authors: Shenhao Chen, Shiyong Zhao
    Abstract:

    The inhibitive action of the four surfactants, cetyltrimethylammonium bromide (CTAB), Sodium Dodecyl Sulfate, Sodium oleate and polyoxyethylene sorbitan monooleate (TWEEN-80), on the corrosion behavior of copper was investigated in aerated 0.5 mol dm(-3) H2SO4 solutions, by means of electrochemical impedance spectroscopy. These surfactants acted as the mixed-type inhibitors and lowered the corrosion reactions by blocking the copper surface through electrostatic adsorption or chemisorption. The inhibitor effectiveness increased with the exposure time to aggressive solutions, reached a maximum and then decreased, which implies the orientation change of adsorbed surfactant molecules on the surface. CTAB inhibited most effectively the copper corrosion among the four surfactants. The copper surface was determined to be positively charged in sulfuric acid solutions at the corrosion potential, which is unfavourable for electrostatic adsorption of cationic surfactant, CTAB. The reason why CTAB gave the highest inhibition efficiency was attributed to the synergistic effect between bromide anions and positive quaternary ammonium ions. C16H33N(CH3)(4)(+) ions may electrostatically adsorbed on the copper surface covered with primarily adsorbed bromide ions. On the basis of the variation of impedance behaviors of copper in the surfactant-containing solutions with the immersion time, the adsorption model of the surfactants on the copper surface was proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.

Xiangqian Liu - One of the best experts on this subject based on the ideXlab platform.

  • impedance spectroscopic study of corrosion inhibition of copper by surfactants in the acidic solutions
    Corrosion Science, 2003
    Co-Authors: Shenhao Chen, Bingsheng Yin, Shiyong Zhao, Xiangqian Liu
    Abstract:

    The inhibitive action of the four surfactants, cetyltrimethylammonium bromide (CTAB), Sodium Dodecyl Sulfate, Sodium oleate and polyoxyethylene sorbitan monooleate (TWEEN-80), on the corrosion behavior of copper was investigated in aerated 0.5 mol dm(-3) H2SO4 solutions, by means of electrochemical impedance spectroscopy. These surfactants acted as the mixed-type inhibitors and lowered the corrosion reactions by blocking the copper surface through electrostatic adsorption or chemisorption. The inhibitor effectiveness increased with the exposure time to aggressive solutions, reached a maximum and then decreased, which implies the orientation change of adsorbed surfactant molecules on the surface. CTAB inhibited most effectively the copper corrosion among the four surfactants. The copper surface was determined to be positively charged in sulfuric acid solutions at the corrosion potential, which is unfavourable for electrostatic adsorption of cationic surfactant, CTAB. The reason why CTAB gave the highest inhibition efficiency was attributed to the synergistic effect between bromide anions and positive quaternary ammonium ions. C16H33N(CH3)(4)(+) ions may electrostatically adsorbed on the copper surface covered with primarily adsorbed bromide ions. On the basis of the variation of impedance behaviors of copper in the surfactant-containing solutions with the immersion time, the adsorption model of the surfactants on the copper surface was proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.

Bingsheng Yin - One of the best experts on this subject based on the ideXlab platform.

  • impedance spectroscopic study of corrosion inhibition of copper by surfactants in the acidic solutions
    Corrosion Science, 2003
    Co-Authors: Shenhao Chen, Bingsheng Yin, Shiyong Zhao, Xiangqian Liu
    Abstract:

    The inhibitive action of the four surfactants, cetyltrimethylammonium bromide (CTAB), Sodium Dodecyl Sulfate, Sodium oleate and polyoxyethylene sorbitan monooleate (TWEEN-80), on the corrosion behavior of copper was investigated in aerated 0.5 mol dm(-3) H2SO4 solutions, by means of electrochemical impedance spectroscopy. These surfactants acted as the mixed-type inhibitors and lowered the corrosion reactions by blocking the copper surface through electrostatic adsorption or chemisorption. The inhibitor effectiveness increased with the exposure time to aggressive solutions, reached a maximum and then decreased, which implies the orientation change of adsorbed surfactant molecules on the surface. CTAB inhibited most effectively the copper corrosion among the four surfactants. The copper surface was determined to be positively charged in sulfuric acid solutions at the corrosion potential, which is unfavourable for electrostatic adsorption of cationic surfactant, CTAB. The reason why CTAB gave the highest inhibition efficiency was attributed to the synergistic effect between bromide anions and positive quaternary ammonium ions. C16H33N(CH3)(4)(+) ions may electrostatically adsorbed on the copper surface covered with primarily adsorbed bromide ions. On the basis of the variation of impedance behaviors of copper in the surfactant-containing solutions with the immersion time, the adsorption model of the surfactants on the copper surface was proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.

Yasuhiko H Mori - One of the best experts on this subject based on the ideXlab platform.

  • surface tensions of aqueous solutions of lithium Dodecyl Sulfate Sodium oleate and Dodecylbenzene sulfonic acid in contact with methane under hydrate forming conditions
    Fluid Phase Equilibria, 2011
    Co-Authors: Naoki Ando, Yui Kuwabara, Takehide Kodama, Yasuhiko H Mori
    Abstract:

    Abstract This paper presents experimental surface tension data of separate aqueous solutions of lithium Dodecyl Sulfate, Sodium oleate, and Dodecylbenzene sulfonic acid, each in contact with methane at a pressure of 3.90 MPa or 4.00 MPa and a temperature of 275 K (i.e., a condition in which a clathrate hydrate of methane is thermodynamically stable). These data were obtained by use of the pendant drop method in the metastable absence of any hydrate in the experimental system (i.e., every measurement was accomplished during the induction time for the hydrate formation). The surfactant concentration ranged up to 5.0 g kg −1 for lithium Dodecyl Sulfate, 0.6 g kg −1 for Sodium oleate, and 1.0 g kg −1 for Dodecylbenzene sulfonic acid. Based on the obtained surface-tension versus surfactant-concentration data, we estimated the critical micelle concentrations for lithium Dodecyl Sulfate, Sodium oleate and Dodecylbenzene sulfonic acid to be about 3.2 g kg −1 , 0.12 g kg −1 and 0.39 g kg −1 , respectively.