Abstract
The inhibitive action of plant leaf extracts, Crataegus oxyacantha (Hawthorn) and Prunus Avium (Sweet Cherry) on the corrosion of mild steel in 0.5 M HCl solution was investigated using open circuit potential-time measurements (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Functional groups of these plants’ leaf extracts and their absorption bands were identified by Fourier transform infrared spectroscopy (FTIR) and Ultra-Violet Spectrophotometer (UV), respectively. The leaf extracts showed good inhibition efficiency in hydrochloric acid solution. Potentiodynamic polarization curves revealed that Crataegus oxyacantha and Purnus Avium plants leaves extracts acted as mixed type inhibitors. Theoretical fitting of different isotherms, Langmuir, Florry–Huggins and the kinetic–thermodynamic models was tested to describe the mode of inhibitors’ adsorption on mild steel surface. UV spectra proved that the inhibiting action takes place through simple physical adsorption of the extracts molecules on mild steel surface.
Highlights
Mild steel has been extensively used in several applications including constructions of tanks, petroleum refineries equipment and flow lines as well as transmission pipelines due to its ease of fabrication and low cost [1,2,3,4,5,6]
This work aims to explore the influence of Crataegus oxyacantha and Prunus Avium, leaf extracts on the corrosion of mild steel in hydrochloric acid using electrochemical techniques
An appropriate volume of 4 M HCl is added to an appropriate volume of the stock solution of plant leaf extract and double distilled water to obtain a solution of 0.5 M HCl solutions and the required concentration of the extract
Summary
Mild steel has been extensively used in several applications including constructions of tanks, petroleum refineries equipment and flow lines as well as transmission pipelines due to its ease of fabrication and low cost [1,2,3,4,5,6]. Hydrochloric acid is widely applied in various processes such as pickling and descaling of metals, chemical or electrochemical processes in oil refinery as well as deactivation of equipment in atomic power establishments’. Various corrosion controlling methods were used to protect metals such as protective coatings, cathodic protection and the use of corrosion inhibitors [7]. Among these methods, the latter is one of the most practical methods especially in acidic media. The latter is one of the most practical methods especially in acidic media Such inhibitors can significantly decrease the corrosion rate when added to a corrosive environment in small concentrations [8,9,10]
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