Production and investigating the effect of Echium amoenum Fisch- 8Me (part of stem and leaf, wastes) extract as green and cheap corrosion inhibitor on St37 steel in 3.5 wt% NaCl corrosive medium

Abstract The purpose of this study was to produce a green inhibitor from Echium amoenum Fisch-8Me plant wastes. The stems and leaves of this plant are a source of active compounds that can act as active sites for the adsorption of steel inhibitory molecules. First, the plant extract extracted using the maceration method. The polarization, EIS, FT-IR & SEM tests performed. Electrochemical studies showed that this material, as a mixed inhibitor was reduced the corrosion rate by absorbing the surface of the metal and blocking active points. The highest inhibition efficiency in the corrosive environment of 3.5 wt% NaCl in concentration 800 (ppm) Echium amoenum Fisch- 8Me (part of stem and leaf, wastes) extract was 92.2%. This extract created a protective layer on the steel surface. Therefore; it can be said that the combination of several parts of the plant itself, such as (part of stem and leaf, wastes), Echium amoenum Fisch- 8Me has a significant effect on increasing the inhibitory efficiency of the extract and the most beneficial and effective compounds in inhibition have been taken. It is introduced as a new green, environmentally friendly and cheap corrosion inhibitor on St37 steel in 3.5 wt% NaCl corrosive medium.