Effect of ethylenediamine on corrosion of AISI 4130 steel alloy in 30% ethylene glycol solution under static and hydrodynamic condition

Abstract

Effect of ethylenediamine on corrosion of AISI 4130 steel alloy in 30% ethylene glycol solution under static and hydrodynamic conditionEinfluss von Ethylendiamin auf die Korrosion der Stahllegierung 25CrMo4 in 30 % Ethylen-Glykol-Lösung unter statischen und hydrodynamischen BedingungenThe electrochemical behavior of steel alloy in 30% ethylene glycol-water solution at different solution rotating speeds was investigated by polarization curves and AC impedance measurements. The results obtained showed that corrosion rate was not changed significantly in different rotating speed. The effect of ethylenediamine as inhibitor was studied and high inhibition efficiency was obtained. It was found that inhibitor adsorption was occurred in presence of inhibitor. The inhibiting effect of the ethylenediamine was explained on the basis of the competitive adsorption between the inhibitor and the aggressive Clions and the adsorption isotherm basically obeys the Langmuir adsorption isotherm. Thermodynamic parameters for inhibitor adsorption were determined and reveal that the adsorption process is spontaneous.

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“…To obtain a satisfactory impedance simulation of silicate coated aluminum, it is necessary to replace the capacitor (C) with a constant phase element (CPE) Q in the equivalent circuit. The most widely accepted explanation for the presence of CPE behavior and depressed semicircles on solid electrodes is microscopic roughness, causing an inhomogeneous distribution in the solution resistance as well as in the double‐layer capacitance .…”

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