Sodium lignosulfonate biomolecule application as an effective steel-rebar corrosion inhibitor in a chloride induced–simulated concrete pore solution.

Background: Based on the outstanding mechanical properties of metallic alloys, they are widely used in a variety of industries including civil engineering. However, corrosion of alloys can shorten the buildings' practical lifelong. Nowadays, corrosion of metallic alloys in harsh chloride-contaminated cement-concrete-based environments (including skyscrapers and bridges) has become one of the major concerns of experts and scientists. Methods: Herein, sodium lignosulfonate, which has been conventionally used as a de-foaming agent in food, was utilized as a biocompatible organic inhibitor for the reinforcement of mild steel in chloride-contaminated corrosive concrete pore solution (CPS). The impact of sodium lignosulfonate was estimated by employing electrochemical polarization and impedance spectroscopy (EIS) methods. Significant findings: Results evidenced that sodium lignosulfonate can substantially retard steel corrosion and its impact was ascended by increasing the concentration. The maintained Electrochemical Impedance Spectroscopy (EIS) results clarified that around 95% of corrosion was eliminated by the inclusion of 1 wt.% sodium lignosulfonate. Also, polarization assessments certified that sodium lignosulfonate can decline steel aggression by mixed inhibition mechanism. The Field Emission Scanning Electron Microscopy (FE-SEM) micrographs disclosed that corrosion products disappeared and the corrosion rate prosperously declined upon sodium lignosulfonate inclusion in the CPS. Meanwhile, the Raman and Grazing X-ray Diffraction (GXRD) outcomes declared that the sodium lignosulfonate-based layer successfully developed over the immersed sample surface. [ABSTRACT FROM AUTHOR]