Electrochemical Behaviour of Stainless Steel L80 in a Multiphase Environment
Abstract
In this study, we focused on a gas field of Gassi Touil-Algeria where different reports showed failures of steel, caused mainly by corrosion and cracking. Thus, this work contributes to inhibition of stainless steel L80 by an amine-based inhibitor N-(2-aminoethyl). Results of this work indicate that for protection of stainless steel L80 immersed in a multiphase medium, N-(2-aminoethyl) amine-based corrosion inhibitor has a satisfactory protective power. In addition, this inhibitor can be widely used, in particular because of its low toxicity towards environment. For a dose of 50 ppm of this inhibitor, inhibiting efficiency obtained by polarization resistance technique is 93%, and that measured by charge transfer resistance of Electrochemical Impedance Spectroscopy (EIS) technique is 99.9%. Inhibitor addition to multiphase medium increased polarization resistance of L80 steel, and slowed down its corrosion rate from 9.95E-3 to 7.11E-5 mm/year for 0 to 50 ppm of inhibitor. EIS results clearly show increase in capacitive loop diameter as inhibitor concentration increases, in line with the increase in polarization resistance.
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