Evaluation of the Corrosion Inhibiting Effect of an Ionic Liquid (N-dimethyl-N-di(cocoalkyl) Ammonium Methyl Sulfate) on API 5L X52 Steel in Hydrochloric Acid

摘要

In the present work, the ionic liquid (IL) N-dimethyl-N-di(cocoalkyl) ammonium methyl sulfate(DCA) was tested as a corrosion inhibitor (CI). The tests were carried out in 1 M solutions ofhydrochloric acid ( ) in order to inhibit the corrosion of API 5L X-52 steel. The maximuminhibition efficiency (IE) was obtained at 4 h and 50 C within the 96-99% interval and IE wasobtained at 0 h and 30 C within the 50-94% interval. The tests indicated that DCA inhibited the steelcorrosion and worked as a mixed-type inhibitor, where the molecular adsorption on steel was describedby the Langmuir isotherm, whereas thermodynamics suggested that a physisorption process occurred.