Mitigation of concrete reinforced steel corrosion by penta sodium triphosphate: physicochemical and electrochemical investigations

Abstract

The capacity of penta sodium triphosphate (PST) to avert the steel reinforcement corrosion in contaminated concrete by NaCl was investigated for 480 days using electrochemical impedance spectroscopy, potentiodynamic polarization, half-cell potential and gravimetric methods. The mechanism of interaction of PST molecules and the changes took place on the steel surface assessed using spectroscopic and microscopic analysis. Compression tests of the concrete specimens were performed to monitor the strength of concrete after the addition of PST. Investigations proved that PST acts as a competent admixture for inhibiting the corrosion of steel reinforcement in concrete without affecting its strength for a longtime.