A physicochemical characterization was conducted for samples of rich triethylenglycol RTEG(contacted with natural gas and moisture), poor glycol PTEG (without moisture) and water ofcondensation taken from a cryogenic unit TWC. Tests of linear polarization resistance (LPR)and Tafel polarization curves were performed to determine the corrosion rate of RTEG,PTEG and TWR (Teg water removed) and the corrosion inhibitor (Coastal 1755) efficiencyat different concentrations for static conditions. One rotating ring electrode coupled to apotentiostat galvanostat Autolab/PGSTAT 302N was used for evaluation, using procedures inaccordance with ASTM G-170- 01, “Standard Guide for Evaluating and Qualifying Oil Fieldand Refinery Corrosion Inhibitors in the Laboratory “.The corrosion deposit extracted from the drainage system was characterized by an emissionspectrometer, brand Jarrel Ash and x-ray di...