In this work the corrosion kinetics of X80 steel immersed in synthetic seawater was analyzed using the electrochemical noise technique in static condition at room temperature and atmospheric pressure. An arrangement of three electrodes was used in an electrochemical cell, with two nominally identical working electrodes (X80 steel) and a saturated calomel electrode (SCE) as reference one. The results obtained were used to calculate the localization index (LI), which indicated that the corrosion process has a localized character. The optical micrographs confirmed the attack morphology of the corrosion process. Also, the corrosion rate values for X80 steel obtained from Noise Resistance (Rn) increase and decrease as exposure time elapses. The above is attributed to the rupture and subsequent regeneration of the corrosion products film adsorbed onto the metal surface.
This work presents the influence of turbulent flow on corrosion kinetics of API X80 steel 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. Different rotation speed were studied: 0 (or static conditions), 1000, 2000, 3000, 4000, 5000 and 7000 rpm. The electrochemical techniques used in the corrosion study were cathodic polarization curves and total polarization curves, using a conventional three electrode cell. The results of cathodic kinetic analysis show that the turbulent flow has influence at all rotation speeds, that is to say, the corrosion process is controlled by a mass transfer process associated with the oxygen diffusion from the bulk electrolyte to metal surface. In addition, the corrosion rate shows a strong increase as the rotation speed of the RCE increases and consequently increasing the Reynolds number.
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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