The Role of Echium Angustifolium Mill Extract in The Corrosion Mitigation of Carbon Steel in Sulfuric Acid Solution
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HYSICOCHEMICAL PROBLEMS OF MATERIALS PROTECTION
The Role of Echium Angustifolium Mill Extract in The Corrosion Mitigation of Carbon Steel in Sulfuric Acid Solution Emad E. El-Katori*, ** Department of Chemistry, Faculty of Science, New Valley University, El-Kharja, 72511 Egypt *e-mail: [email protected] **e-mail: [email protected] Received January 23, 2019; revised February 23, 2020; accepted February 28, 2020
Abstract– The role of Echium angustifolium Mill extract for advancing corrosion resistance of carbon steel in 1.0 M H2SO4 solution was discussed in this research. Weight loss (WL), open circuit potential (OCP), potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) methods were applied to monitor the corrosion behavior of carbon steel in 1.0 M H2SO4 solution. The influence of temperature was studied from 25–45°C and some thermodynamic parameters were computed. The Surface morphology of the carbon steel surface was examined via different techniques. These measurements confirmed that the existence of Echium angustifolium Mill extract reduces the corrosion rate (CR), corrosion current densities (icorr), and double layer capacities (Cdl), simultaneously increase the polarization resistance (Rp) values. Tafel plots observed that the Echium angustifolium Mill extract play as a mixed type inhibitor. Electrochemical impedance confirmed that the existence of the applicable extract reduced the double layer capacitance and enhanced the charge transfer resistance. The extract molecules adsorbed on the metal surface follow Langmuir adsorption isotherm. The gained data confirmed that the inhibition efficiency (η%) increase with the increase of extract concentration. Keywords: acid corrosion, carbon steel, Echium angustifolium Mill, weight loss, electrochemical techniques, surface morphology DOI: 10.1134/S207020512005010X
1. INTRODUCTION Anti-corrosion of carbon steel in various acid media is a field of study which still controls significant attention given the great application of carbon steel for everyday need [1, 2]. Generally, carbon steel has been applied as a construction material for pipe work in the oil and gas manufacture for example, down-hole tubular, flow lines and transportation pipelines. In oil fields sulfuric and hydrochloric acid solutions are suggested because the cheapest system to eliminate calcium carbonate, CaCO3, extent inside the pipelines under several conditions [3, 4]. Therefore, corrosion inhibitors should be inserted with the hydrochloric acid and sulfuric acid solutions to avert the destructive impact of these acids on the pipe line surfaces [5, 6]. Corrosion may purpose hazardous and costly damage to the whole thing from bridges, pipelines and common buildings to vehicles, water and wastewater systems, and even home instruments [7, 8]. Corrosion is one of the largest problem in the oil and gas industries. The employing of organic inhibitors is one of the largest practical methods for resistance of metals and alloys to avoid corrosion process, while
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