Study of Temperature Influence on Inhibitory Efficiency of Three Phosphate Inhibitors by Mass Loss

Abstract

The effect of temperature on steel samples immersed in concrete pore solutions contaminated by chlorides incorporating three inhibitors based on phosphate (Na₃PO₄, K₂HPO₄, and Na₂PO₃F) was studied by gravimetric measurements at several ranges: 298K, 308K and 318K. The results obtained for the use of these three products show that the inhibitory efficacy is lower at 318K, than that detected at 308K and 298K of temperature. In addition, we find that the best inhibitory efficiency at 298K was detected for Na₂PO₃F (75.80% at 0.05 mol/l of concentration) followed by K₂HPO₄ (65.05% at 2.5 10^-3mol/l) and then Na₃PO₄ (61.48% at 7.5 10^-3mol/l).