Triticum aestivum extract as corrosion inhibitor for stainless steel (SS-410) in acidic media: Experimental and theoretical study

There are various types of industrial applications in petroleum industries in which 15% hydrochloric acid solution is used, which results in corrosion problem. The objective of this study is to experimentally evaluate the corrosion inhibition properties of Triticum aestivum plant extract in a 15% hydrochloric acidic (HCl) media for stainless steel (SS-410). Potentiodynamic study shown that maximum 92.69% corrosion inhibition efficiency at 4 g/L of T. aestivum in 15% HCl solution was obtained. Scanning electron microscopy, atomic force microscopy, X-ray photon spectroscopy and X-ray diffraction study confirmed the adsorption of T. aestivum extract on the steel surface. The peaks at 286 ​eV and 530 ​eV demonstrate the presence of carbon and oxygen in the surface of treated SS-410. SS-410 samples immersed in HCl containing 4 g/L TAE possessed comparatively lower 193.75 ​nm surface roughness as a result of corrosion inhibitory activity of phytochemicals present in the TAE. TAE followed Langmuir adsorption isotherm that confirmed monolayer formation on the surface of SS-410. Theoretical study confirmed that (+)-Lariciresinol was the main phytochemical responsible for anti-corrosive effect. Hence, TAE has shown anti-corrosive behaviour in the acidic 15% HCl solution on SS-410 surface.