51312-01270-Electrochemical Corrosion Behavior of X70 Pipeline Steel in Wall Jet Zone under Jet Impingement at H

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Product Number: 51312-01270-SG

ISBN: 01270 2012 CP

Author: Wei Liu

Publication Date: 2012

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Impingement CO2 corrosion experiments of X70 steel microelectrodes in three different fluid zones under high temperature and high pressure condition were conducted by a loop impingement apparatus. The corrosion behaviors including corrosion morphology corrosion rates and in-situ electrochemical measurements were investigated respectively by scanning electron microscopy (SEM) optical device for two and three dimensions surface measurements and electrochemical workstation as well as shear stress and fluid velocity from computational ?uid dynamics (CFD). The results showed that the microelectrodes in stagnation zone transition zone and wall jet zone had great difference in corrosion rates and morphologies which indicated the obvious effect of flow field on corrosion behaviors of the three zones. The electrochemical analyses indicated that the flow field on different microelectrodes affected the corrosion reaction by accelerating the mass transfer process of cathodic reactants more than by influencing the anodic electrochemical process. The electrode in the stagnation zone had the lowest corrosion rate and roughness value due to low flow velocity and shear stress and compact protective corrosion product formed on it. The electrode in the stagnation zone had the highest corrosion rate and roughness value due to high flow velocity and shear stress and no protective corrosion product formed on it. The electrode in the wall jet zone had the corrosion rate and roughness between those of the above zones. The electrochemical behaviors morphologies and corrosion mechanism of the three zones were also analyzed and compared in detail.