Spinacia oleracea Extract as Green Corrosion Inhibitor for Carbon Steel in Hydrochloric Acid Solution

There is a great environmental demand for using the eco-friendly save corrosion inhibitor for metals and alloys. Green corrosion inhibitors are safe for the environment and have low cost and are easily applicable in many industrial fields. In this respect, the plant Extract of fresh Spinacia oleracea (SPINOLE) was used as a green corrosion inhibitor for carbon steel in a 1.0 M hydrochloric acid corrosive environment. In a 1.0 M hydrochloric acid-corrosive environment, carbon steel was employed using (SPINOLE) as a green corrosion inhibitor. The effectiveness of the produced (SPINOLE) extract at various concentrations (100-500ppm) was assessed using chemical and electrochemical techniques. The impact of temperature and the isotherm of adsorption were investigated. It was discovered that the effectiveness of the extract's ability to stop corrosion diminishes when the temperature is raised and increases with extract concentration. Adsorption of extract elements onto the steel surface without changing the reaction process is what causes the inhibition, and this adsorption complies with the Langmuir adsorption isotherm model. Data on potentiodynamic polarization show that the plant extract inhibitor is mixed-type. The plant extract improves polarization resistance and inhibition performance by adhering to the metal/electrolyte interface, according to potentiodynamic polarization data. The cathodic reaction is delayed when inhibitor molecules are added to an aggressive medium, which results in a negative shift in the open circuit potential. In addition to mass loss, atomic absorption spectroscopy(AAS) was utilized as an indirect gravimetric method. The data from both methods are in good agreement with one another and with electrochemical methods.