Gas hydrate inhibitors (GHI) and Corrosion Inhibitors (CI) often tend to display antagonistic behaviour in flow assurance of oil and gas. Compatible GHI and CI that have no compromises are still under research and development. Latest researches are being done on multifunctional gas hydrate and corrosion inhibitor (GHCl). Glycerol has been tested for its inhibition performance for both hydrate and corrosion in various distinguished experiments. However, glycerol's corrosion inhibition on X52 mild steel in seawater environment has never been tested. In this work, the corrosion inhibitor property of glycerol on X52 mild steel in 3.5wt. NaCl brine solution is investigated. The concentrations of glycerol used are 400, 600, 800, 1000, 5000, and 10000 ppm. The pH and conductivity of glycerol have been measured and the relationship between pH, conductivity and corrosion has been thoroughly discussed. The performance of glycerol has been studied further based on adsorption isotherms such as Langmuir, Frumkin, Temkin and Freundlich isotherm. The Temkin isotherm shows the best fit for adsorption isotherm with R2 of 0.97. © 2020, Malaysian Society of Analytical Sciences. All rights reserved.