Electrochemical behavior of carbon steel under a continuouskerosene flow in two different kinds of sections.

This work studies the electrochemical behavior of carbon steel under a continuous kerosene flow intwo different kinds of sections: a linear section and a 90-degree horizontal elbow section. To apply theelectrochemical techniques, two experimental arrangements were designed, one with theelectrochemical cell in a linear section and the other with the cell in an elbow. The electrochemicaltechniques used were polarization curves and electrochemical impedance spectroscopy (EIS). Thepolarization curves obtained indicated that the values of Icorr, as well as the density of current,increased significantly for the cell placed in the elbow section. Corrosion velocity values show thatthere is a difference between the experimental arrangements. The EIS technique shows that for thearrangement with the cell in an elbow, the resistance of steel to corrosion is lower than for thearrangement with the cell in a linear section. The presence of kerosene in steel modifies the corrosionprocess and avoids the formation and growth of a passive layer, in which the corrosive agentsadsorption increases. Analysis with XPS showed that the system with the cell in a 90-degree horizontalelbow section increases crystal deposits of chloride ions on the metal surface.