Corrosion inhibition effect of sodium tri-polyphosphate on reinforcing steel in simulated concrete pore solution with different pHs, By Fazel Shojaei

Research

Title	Corrosion inhibition effect of sodium tri-polyphosphate on reinforcing steel in simulated concrete pore solution with different pHs
Type	Article
Keywords	Sodium tri-polyphosphate Corrosion inhibition Simulated concrete pore solution Electrochemical measurements Surface analysis DFT
Journal	CONSTRUCTION AND BUILDING MATERIALS
DOI	https://doi.org/10.1016/j.conbuildmat.2022.129819
Researchers	Roghayeh Alizadeh (First researcher) , Reza Naderi (Second researcher) , Mohsen Saremi (Third researcher) , Hoda Hamidi (Fourth researcher) , Fazel Shojaei (Fifth researcher)

Abstract

The inhibition activity of sodium tri-polyphosphate (STPP) for reinforcing steel in chloride-contaminated alkaline solution with pH ranging from 12.5 to 8.5 was explored via electrochemical measurements and FESEM-EDS surface analysis. Based on the results, STPP, acting as a mixed-type corrosion inhibitor, provided the inhibition efficiencies up to 70% at all studied pHs, thus increasing the corrosion resistance of the steel rebars (at least four times) and reducing the corrosion rate significantly. The DFT and Ab-intio simulations suggested that this inhibition behavior was related to the STPP adsorption via solid chemical bonds between the oxygen heteroatoms of STPP and Fe of the metal surface.