This work presents the study of the effects that the electrolyte and the turbulent flow have on the electrochemical kinetic of the super duplex stainless steel (SDSS) immersed in synthetic seawater at room temperature, atmospheric pressure under static and turbulent flow conditions. In order to control the hydrodynamic conditions, a rotating cylinder electrode was used (RCE) at four rotation rate (1000, 3000, 5000 y 7000 rpm). A typical three-electrode electrochemical cell was used. Cylindrical working electrodes made of SDSS were used in all experiments as working electrode, sintered graphite bar as auxiliary electrode and a saturated calomel electrode as reference. In order to analysis the corrosion phenomenon, the technique electrochemical impedance spectroscopy was used during 24 hours of the exposure time. According to the impedance technique, the corrosion rate decreased as the exposure time in seawater increased. In addition, the effect of the turbulent flow on corrosion process was really negligible. On the other hand, it is important to point out that the oxygen diffusion was the limiting process in the SDSS corrosion.
This work presents the influence of the turbulent flow in the corrosion of super duplex stainless steel (SDSS) samples immersed in synthetic seawater at room temperature and atmospheric pressure. In order to control the turbulent flow conditions, a rotating cylinder electrode (RCE) was used. Five different rotation rates were studied: 0 (or static conditions), 1000, 2000, 3000, 5000 and 7000 rpm. The electrochemical technique used in the corrosion study was potentiodynamic polarization curve. In addition, Eisenberg equation and analysis of dimensionless numbers were used to determine the limiting current density generated by the cathodic reaction. The results show that of the turbulent flow just has influence in the first rotational speeds of rotating cylinder electrode with an increment in Reynolds number. Cathodic current density obtained at static conditions is higher than densities obtained at 4000, 5000 and 7000 rpm. It is important to point out that at those last rotation speeds; the turbulent flow has not influence on the cathodic current density.
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