Effective corrosion inhibition of mild steel by eco-friendly thiourea functionalized glucosamine derivatives in acidic solution

In the view of environmental protection and sustainable development, the application of green effective inhibitors for metal corrosion in industry field is of great significance. In this work, two thiourea functionalized glucosamine derivatives, 5-hydroxy-1-phenyl-4-(1,2,3,4-tetrahydroxybutyl)imidazolidine-2-thio ne (GA-1) and 1-phenyl-3-(2,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)thiourea (GA-2), were synthesized as eco-friendly corrosion inhibitors for mild steel (MS) in 1 M HCl solution, and their inhibition performance were evaluated by electrochemical tests and surface analyses. The electrochemical tests and surface analyses indicate that both GA-1 and GA-2 have high inhibition performance. Especially for GA-2, the inhibition efficiency reaches 97.7% with a concentration of 0.64 mM. Theoretical calculations were also conducted to elucidate the adsorption mechanism of GA-1 and GA-2 on MS surface. (C) 2020 Elsevier Inc. All rights reserved.

Automated summary

Two thiourea functionalized glucosamine derivatives, GA-1 and GA-2, were synthesized as eco-friendly corrosion inhibitors for mild steel in 1 M HCl solution. Both inhibitors showed high efficiency, with GA-2 reaching an inhibition efficiency of 97.7% at a concentration of 0.64 mM. Theoretical calculations were also conducted to elucidate the adsorption mechanism of the inhibitors on the steel surface.