Étude de l’effet inhibitrice des extrais de plantes sur la corrosion de l’acier CX52

Abstract

The present study is attempt to find new inhibitor that can to easily be prepared and applied ,as well as nontoxic, cheep and available . In this study an aqueous extract taken from natural plant are used to X52 X60 in different mediums like salt solution and acidic solutions . and for the purpose of evaluating the inhibition performance of this inhibitor, many tests have been conducted which include measuring the corrosion rate through methods known weight loss, completeness of Tafel curve and microscopic examination test . In lossing weight method the inhibition efficiency of X52 X60 corrosion in salt solution reached about (97,19%) while the efficiency is reached (81.33%) has 2.8963 mA/Cm2 acid , In Tafel test ,current density of corrosion) H2SO4(throughout of its been dropped because of the addition of inhibitor to a ratio of 0,1275 mA/Cm2 H2SO4(value in the salt solution that is completely empty from inhibitor but in the ( solution the current density is lowered to be only of its value without inhibitor, Microscopic examination test shows the clearness of the metal surface which are under the corrosion medium and which contains inhibitor from any kind of corrosion that can be found on those surface which are under mediums completely empty from inhibitor and also shows the clearness of that protect layer on the surface . The data of corrosion rate show that the way of doing those organic inhibitor is adsorbing and the inhibitor mecluleus is adsorbed on the metal surface according to Langmuir adsorption isotherm