Estudio de corrosión del acero API 5L X52 en solución de NaCl mediante el uso de “Rotating Cylinder Electrode” (RCE)

Abstract

This project studied the changes in the surface of API 5L-X52 steel submerged in 3% NaCl, by the Rotating Cylinder Electrode (RCE) method. The experimentation was carried out at 850, 1000 and 1500 RPM. These test pieces subjected to the test after 108 h of experimentation presented a loss of mass, change in color and appearance on their surface. By obtaining macrographs the presence of uniform corrosion was determined with small indications of pitting. The micrographs allowed the determination of the approximate thickness of material lost due to the process of corrosion and the corroboration of the type of corrosion that occurred. Based on material characterization tests based on the API 5L: Specification for Line Pipe standard, it was determined that the material tested corresponds to a steel PSL type I and through the corrosion test was determined that at higher rotational speed greater mass loss is achieved because the presence of the passivity layer and corrosion product residues is reduced which serves to protect the material from the corrosion process. A mathematical model was obtained that represents the loss of mass over time.