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One of the most employed methods for CO2 corrosion control in oil and gasproduction and transportation industry is the use of carbon and low alloy steels inconjunction with corrosion inhibitors. The inhibitor performance can be influenced by themicrostructure and chemical composition of the steel. In previous works, it was shownthat 1% Cr addition to carbon steel decreased the protectiveness of a commercialimidazoline-based inhibitor. However, it was suspected that changing the flow rates maymodify the inhibitor behaviour. In the present work, the performance of an imidazolinebasedinhibitor was investigated on two carbon steels one with the other without 1% Cr,under different flow rates.Corrosion and corrosion inhibition experiments were carried out using a rotatingcylinder electrode at different rotation speeds in a deoxygenated 5 wt.% NaCl CO2-saturated solution at 40ºC, pH 6 with and without inhibitor addition. Electrochemicalmeasurements were taken during each experiment and sample surfaces were analyzedafter each experiment. Inhibitor performance was found to be dependent on flow velocityand chemical composition of carbon steel.