SYNERGISTIC INHIBITION EFFECT OF Na₂MoO₄ AND EDTA ON CORROSION OF COLD ROLLED STEEL IN HCl SOLUTION

The synergistic inhibition effect of Na2MoO4 and EDTA on the corrosion of cold rolled steel in HCl solution was investigated by weight loss and polarization curves methods.Both Na2MoO4 and EDTA had moderate inhibitive effect on the corrosion,and acted as anodic type inhibitor for the cold rolled steel.The adsorption of Na2MoO4 and EDTA on the steel surface accorded with the Temkin adsorption isotherm.Incorporation of Na2MoO4 and EDTA significantly improved the inhibition performance.Polarization curves showed that the complex of Na2MoO4 with EDTA acted as a mixed type of inhibitor,mainly inhibiting the anodic reaction.The synergistic inhibition mechanism was discussed.