Abstract
ABSTRACTCorrosion inhibition behavior of orange peel waste extracts in 1 M hydrochloric acid medium on mild steel surface was studied using weight loss studies, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and surface phenomena using scanning electron microscopy (SEM) analysis. Better inhibition efficiency for orange extracts was achieved by weight loss measurements. The maximum inhibition efficiency of 99.19% was achieved for 0.25% of waste extract at room temperature. EIS analysis revealed that increase in concentration of orange peel extract (OPE) increases the charge transfer resistance with the continuous decrease in capacitance which confirms the development of dense protective layer on the metal surface at the electrolyte interface. Both the electrochemical investigation such as potentiodynamic polarization and impedance analysis confirmed the improved inhibitory efficiency of OPE by following Langmuir isotherm model. SEM analysis confirms that the corrosion inhibition of OPEs was proceeded by forming an organic protective layer over the mild steel surface by means of the adsorption process by physical contact. These results confirm that the ethanolic extract of orange waste can be used as a potential corrosion inhibitor in industrial applications.
Highlights
Corrosion of mild steel due to acidic attack is one of the universal problems with financial implications due to the necessity of mild steel in several industries, for example, oil and gas transportation, chemical industries, fuel refineries, etc
electrochemical impedance spectroscopy (EIS) analysis revealed that increase in concentration of orange peel extract (OPE) increases the charge transfer resistance with the continuous decrease in capacitance which confirms the development of dense protective layer on the metal surface at the electrolyte interface
scanning electron microscopy (SEM) analysis confirms that the corrosion inhibition of OPEs was proceeded by forming an organic protective layer over the mild steel surface by means of the adsorption process by physical contact
Summary
Corrosion of mild steel due to acidic attack is one of the universal problems with financial implications due to the necessity of mild steel in several industries, for example, oil and gas transportation, chemical industries, fuel refineries, etc. The organic molecules consisting of heteroatoms with unsaturated bonds were commonly employed as inhibitors for mild steel. The usefulness of these synthesized organic inhibitors is allied to the occurrence of functional groups with sulfur, oxygen and nitrogen heteroatoms in their structure [2,3,4,5]. Nearly every organic compound is costly and noxious to mankind and the surroundings To triumph over this problem, a detailed analysis of new commercially cheap, non-hazardous and ecological corrosion inhibitors is vital. This biologically mediated innovative type of corrosion inhibitors can result from the available plant sources.
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