Effect of Addition of Pyridine-Based Corrosion Inhibitors on Corrosion Behaviors of Carbon Steel in a Co2-Containing Environment

Muhammad Asep Yudistira, Rini Riastuti, Lamria Mora Dhea Friskila

Research output: Contribution to journalArticle


In this study, a pyridine derivative was evaluated as a corrosion inhibitor for mild steel in 3 wt% NaCl with a CO2-containing environment, using varying inhibitor concentrations, which are 25 ppm, 50 ppm, and 75 ppm, and also varying temperatures, which are 40and 90C. The Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography – Mass Spectrometry (GCMS) was used to characterize the inhibitor and analyze the adsorption process, which indicated that the inhibitor has molecules with heteroatoms and π electrons in their structure which facilitated the adsorption process. The corrosion inhibition efficiency was measured by using electrochemical impedance spectroscopy (EIS) method. The results indicate that that corrosion rate decreases with increasing inhibitor concentration and increases with increasing temperatures. The inhibition efficiency was also found to increase with increasing inhibitor concentration and temperatures. The data was also used to determine the adsorption isotherm type and calculate the adsorption parameters. The result shows that the adsorption of the inhibitor molecules on mild steel surface occurs spontaneously, and was found to follow the Langmuir adsorption isotherm, and is governed by both physical and chemical mode. The nature of the protective film formed on the mild steel surface was studied using Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS). The surface characterization result result shows the presence of carbon and oxygen before inhibition, showing the product of CO2 corrosion which is FeCO3, which decreases significantly after inhibition, indicating that the inhibitor is successful in decreasing the corrosion rate of mild steel.
Original languageEnglish
Pages (from-to)23315-23326
Number of pages12
JournalTest Engineering and Management
Publication statusPublished - 30 Apr 2020


  • Corrosion Inhibitor
  • Pyridine
  • CO2 Corrosion
  • electrochemical impedance spectroscopy


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