Some Venezuelan crude oils have shown exceptional inhibition of sulfide stress corrosion cracking susceptibility and general corrosion in carbon steels, even up to 99 % water cut. The inhibition mechanism of a specific crude oil was studied and the effect of saturate, aromatic and resin fractions separated from the crude oil was evaluated. Results from
electrochemical impedance spectroscopy, complemented with chemical analysis of electrode surface, corrosion products and crude oil fractions were consistent with an adsorption model for corrosion inhibition.
Keywords: crude oil inhibition, corrosion inhibition, electrochemical impedance spectroscopy, hydrogen permeation, CO2 Corrosion, SARA analysis, Saturate, Aromatic, Resin