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

The effect of temperature on steel samples immersed in concrete pore solutions contaminated by chlorides incorporating three inhibitors based on phosphate (Na 3 PO 4 , K 2 HPO 4 , and Na 2 PO 3 F) was studied by gravimetric measurements at several ranges: 298, 308, and 318 K. The results obtained for the use of these three products show that the inhibitory efficacy is lower at 318 K than that detected at 308 and 298 K of temperature. Also, we find that the best inhibitory efficiency at 298 K was detected for Na 2 PO 3 F (75.80% at 0.05 mol/l of concentration) followed by K 2 HPO 4 (65.05% at 2.5 10 − 3 mol/l) and then Na 3 PO 4 (61.48% at 7.5 10 − 3 mol/l).