INHIBITION EFFECT OF GUAR GUM ON CORROSION OF STORAGE TANK FOR CRUDE OIL IN BASRA REFINERY

Corrosion is responsible for numerous damages mainly in the industrial scope. The best way to fight this damage is prevention. One of the most well-known and useful methods to avoid or mitigate destruction/degradation on the surface of metals is a corrosion inhibitor. Low cost, environmentally friendly, and non-toxic are some of the best features in the inhibitor, guar gum, used in this study. The study shows that the potential of the metal is shifted positively when the concentration of the inhibitor is increased. Low current density was also observed due to increasing the concentration of the inhibitor. Therefore, a low corrosion rate means low current density and more positive potential of the metal. Different concentrations of inhibitor are used and the optimum concentration that showed a low corrosion rate is 2.5 g/L. The efficiency of the optimum concentration is 65%. The result states that the guar gum is absorbed on the surface of the metal and gives an unchanging chelate five-membered-ring with ferrous cation Fe+2