Behavior of Corrosion Inhibitor on the New Ultra High Strength Steel

Abstract
Electrochemical techniques have been used for investigating the inhibition of new ultra high strength steel grade. Inhibitors play a key role in the control of corrosion associated with the production and transport of crude oil and gas. The free corrosion potential, corrosion current density and corrosion rates were determined in deaerated 3% NaCl + Diesel + inhibitors saturated with CO₂ at 50 ^oC. The electrochemical techniques used were lineal polarization resistance, polarization curves, Tafel Extrapolation and Electrochemical Impedance Spectroscopy (EIS); The corrosion rate was calculated by using Slopes Tafel and the inhibitor efficiency was determined from corrosion rates with and without inhibitor. The morphology of the steel surface in the uninhibited and inhibited solution was examined using the scanning electron microscope coupled with energy dispersive X-ray analysis system. It was found that the inhibitors displayed high inhibition efficiencies.