Prevention of Reinforcement Corrosion in Concrete by Sodium Lauryl Sulphate: Electrochemical and Gravimetric Investigations

Abstract

Prolonged corrosion inhibition response of sodium lauryl sulphate (SLS) on steel reinforcement in contaminated concrete was investigated by gravimetric method and electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy. Using half cell potential measurements probability of steel reinforcement corrosion was monitored for a period of 480 days. FT-IR spectroscopic analysis of the corroded products deposited on the steel reinforcement revealed the mechanism of corrosion inhibition. Modification in the surface morphology of steel specimens in the concrete was examined by optical microscopy. During the period of investigation (480 days), SLS showed appreciable corrosion inhibition efficiency on the steel reinforcement in concrete.

Test of inhibitors for preventing corrosion of steel reinforcement in concrete

“…These results show that locust bean gum and MCI are acting as good corrosion inhibitors on steel reinforcement. Similar results have been presented in the literature [14].…”

“…The chemical composition of steel rebar B 500 manufactured at Elbasan, metallurgical plant, intended for concrete armor is presented in Table 1. [14].…”

“…Figure 3 shows the comparison of the polarization behavior from a potentiodynamic tests of steel rebar in H2SO4 1 M, in presence of chloride ions 1•10 -3 M solutions. Corrosion potential gets more positive values, and the corrosion rate mitigates in presence of inhibitors [14].…”