The effect of concentration and temperature on the activities of Polyethylene Oxide (PEO) as iron corrosion inhibitor in electrolyte solution of NaCl

Abstract

Internal corrosion in the piping system is a serious problem. The use of corrosion inhibitors for corrosion control in piping systems is a practical and cost-effective method. Many polymers have been reported to be used as an inhibitor corrosion. However, there was little attention to the research of Polyethylene Oxide (PEO) as a corrosion inhibitor in NaCl medium. The purpose of this study was to determine the corrosion inhibition activity of polymeric compounds of polyethylene oxide against ferrous metals in 1% NaCl electrolyte solution. The study of Polyethylene Oxide (PEO) activity as a corrosion inhibitor in 1% NaCl electrolyte solution was carried out by the Wheel Test method with variations in concentration and temperature. The surface analysis of iron by SEM (Scanning Electron Microscopy). The results showed that polyethylene oxide (PEO) had the optimum inhibitory activity at a concentration of 16 ppm, with inhibition efficiency of 80.15% at 25°C. Polyethylene Oxide has adsorption properties which are in accordance with the Langmuir adsorption isotherm with free adsorption energy of -21.385 kJ / mol. The results of the surface analysis by Scanning Electron Microscopy (SEM) showed that polyethylene oxide could inhibit corrosion rates with iron surfaces that had fewer pores than without inhibitors.