ABSTRACT

The anti-corrosion potential of an aqueous leaves extracts of rosa-sinensis plant in 0.5M H2SO4 solution was systematically studied to control its inhibitory effect on the corrosion of mild steel by weight-loss method, potentiodynamic polarisation technique and electrochemical impedance spectroscopy (EIS). When the concentration of the inhibitor solution is increased, the inhibition efficiency of rosa-sinensis plant leaves extract on mild steel corrosion in 0.5M H2SO4 solution increases. The maximum inhibition efficiency has been reached by an aqueous leaves extract of rosa-sinensis plant inhibitor is 97.83% and the corrosion rate is decreased. This is due to the adsorption of phytochemical constituents present in the rosa-sinensis plant leaves extract. The effect of temperature has been studied at different temperatures ranges from 3030 K to 333 K. The corrosion rate is increased and inhibition efficiency decrease at a maximum temperature of 333 K. The adsorption of rosa-sinensis plant leaves on mild steel obey the tempkin and Langmuir adsorption isotherms. Potentiodynamic polarization measurement shows that rosasinensis plant leaves extract acts as an anodic type inhibitor and control the anodic reaction predominantly. The results of electrochemical impedance tests and polarization measurements were found to agree. The surface morphology of polished mild steel, mild steel was immersed in 0.5M H2SO4 (blank) and mild steel was immersed in 0.5M H2SO4 with 10% aqueous leaves extract of rosa-sinensis plant (inhibitor system) have been characterized by SEM and AFM. Scanning electron microscopy (SEM) and AFM studies confirmed that the inhibition of corrosion of mild steel takes place through the adsorption of the aqueous leaves extract of rosa-sinensis plant molecules on the surface of mild steel. Keywords: Acid Corrosion, Acid inhibition, AFM, EIS, Mild steel and Jasminum sambac plant
Publication date: 01/11/2021

https://ijbpas.com/pdf/2021/November/MS_IJBPAS_2021_NOV_SPCL1011.pdf

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https://doi.org/10.31032/IJBPAS/2021/10.11.1011