Corrosion Inhibition of BTA and KI for Brass in Seawater

The synergistic effect between benzotriazole(BTA) and KI on the corrosion inhibition of brass in seawater has been studied using electrochemical polarization,EIS,weight loss,solution analysis,and SEM methods.The results indicated that there was a good synergistic effect between BTA and KI.While the concentration of BTA and KI were 2 mg L-1 and 10 mg L-1,respectively,the inhibition efficiency reached 97.19%.The maximum inhibition efficiency even reached 99.31% considering the adding order of inhibitors.Polarization curves showed that the compound inhibitor of BTA and KI was a mixed inhibitor.SEM images indicated that little or no pitting corrosion occurred on metal surface.Solution analysis revealed that the BTA and KI excellently controled the dezincification of brass in seawater.