En el presente trabajo se evaluo la resistencia a la corrosion por CO 2 de tres aceros utilizados en la fabricacion de tubulares de produccion de crudo y gas: dos aceros con 3% Cr y variaciones en los contenidos de elementos como Mn, V y Cu (designados como 3CrA y 3CrB) y un acero al carbono convencional correspondiente a un tubular grado N80 (designado como N80). El estudio se abordo utilizando tecnicas electroquimicas (Cronopotenciometria, Voltamperometria, Espectroscopia de Impedancia Electroquimica y Resistencia a la Polarizacion Lineal) controlando la hidrodinamica del sistema empleando un electrodo de disco rotatorio. Los experimentos se realizaron en una solucion salina 3,5 % de NaCl previamente desaireada y saturada con CO 2 a una temperatura de 80 °C durante 72 h de inmersion. Los ensayos electroquimicos se realizaron a presion atmosferica y a una velocidad de rotacion constante e igual a 1000 rpm. Se encontro que la resistencia a la corrosion de los aceros aleados con cromo es superior a la del acero al carbono convencional y disminuye en el siguiente orden 3CrB > 3CrA > N80. Este resultado se atribuyo a las diferencias existentes en la metalurgia de estos tres aceros: composicion quimica y microestructura. Adicionalmente, las mediciones electroquimicas revelaron que, independientemente del material, la resistencia a la corrosion de estos aceros aumenta con el tiempo de inmersion. La formacion de una pelicula de productos de corrosion, que bloquea parcialmente la superficie metalica, permite explicar la reduccion de la cinetica de disolucion del metal puesta en evidencia mediante tecnicas electroquimicas. The present work was carried out to evaluate the CO 2 corrosion resistance of carbon steels used for tubing in oil and gas industries. Two low alloy steels containing 3% Cr, identified as 3CrA and 3CrB, were studied by electrochemical techniques (Chronopotentiometry, Voltamperometry, Electrochemical Impedance Spectroscopy and Linear Polarisation Resistance) coupled with a rotating disk electrode in order to control the hydrodynamic conditions of the system. Results obtained for 3% Cr steels were compared with those obtained for the conventional carbon steel, obtained from a N80 grade pipe, to evaluate the advantages of these new materials in terms of their CO 2 corrosion resistance. Electrochemical tests were performed in a 3.5% NaCl solution previously deaereated and saturated with CO 2 at 80 °C up to 72 h of immersion at 1000 rpm. Electrochemical measurements revealed that the corrosion resistance of low Cr steels is higher than that obtained for the carbon steel and decrease in the following order: 3CrB > 3CrA > N80. It is thought that these results might be explained by the differences found in the metallurgical characteristics of the steels (chemical composition and microstructure). In addition, it was found that the CO 2 corrosion resistances of the steels increase with the immersion time, regardless of their chemical composition. This behavior was attributed to the formation of a corrosion product layer on the metal surface when the immersion time increases, mainly blocking the metal dissolution reaction.