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Corrosion of AISI 4130 steel Alloy under Hydrodynamic Condition in Ethylene Glycol+Water+NO_2^- Solution

Journal of Materials Science & Technology 2013年第1期29卷 89-96页

作者： I.Danaee M.Niknejad Khomami A.A.Attar Abadan Faculty of Petroleum Engineering Petroleum University of Technology

The electrochemical behavior of steel alloy in ethylene glycol-water mixture at different solution rotating speeds was investigated by polarization curves and AC impedance measurements （EIS）. The results obtained showed that corrosion rate was not changed significantly at different rotating speeds and was decreased with increasing ethylene glycol concentration. The effect of nitrite as an inhibitor was studied and high inhibition efficiency was obtained. It was found that surface passivation occurred in the presence of inhibitor. The inhibiting effect of the nitrite was explained on the basis of the competitive adsorption between the inorganic anions and the aggressive CI- ions and the adsorption isotherm basically obeys the Flory-Huggins adsorption isotherm. Thermodynamic parameters for steel corrosion and inhibitor adsorption were determined, which revealed that the adsorption process is spontaneous.

关键词： steel 4130 Ethylene glycol Corrosion Hydrodynamic Nitrite

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Thermodynamic and Adsorption Behaviour of Medicinal Nitramine as a Corrosion Inhibitor for AISI steel Alloy in HCl Solution

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Journal of Materials Science & Technology 2013年第9期29卷 884-892页

作者： Ali Reza Hosein Zadeh Iman Danaee Mohamad Hosein Maddahy Abadan Faculty of Petroleum Engineering Petroleum University of Technology

The inhibition ability of 2-amino-5-nitrothiazole （Nitramine） against the corrosion of AISI steel 4130 in 1 mol/L HCI solution was evaluated by polarization, electrochemical impedance spectroscopy （EIS） and chronoamperometry. Polarization studies indicated that nitramine retards both the cathodic and anodic reactions through chemical adsorption and blocks the active corrosion sites. The adsorption of this compound obeyed the Temkin＇s adsorption isotherm. The inhibition efficiency was increased with inhibitor concentration as well as temperature. EIS data were analysed by equivalent circuit model shows that as the inhibitor concentration increased the charge transfer resistance of steel increased whilst double layer capacitance decreased. Kinetic and thermodynamic parameters such as activation energy, enthalpy, entropy and free energy of activation and adsorption were calculated. Atomic force microscopy and optical microscopy were used to study the steel surface with and without inhibitor.

关键词： steel 4130 Corrosion Inhibitor Adsorption isotherm Temkin

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