Corrosion Mechanism of a X100 Pipeline Steel in NACE Brine at 1000 rpm

Abstract

This work shows the research about the corrosion mechanism analysis of a X100 pipeline steel immersed in NACE brine under turbulent flow conditions (1000 and 5000 rpm) at room temperature and atmospheric pressure of Veracruz Port. In order to study the hydrodynamic conditions, a rotating cylinder electrode (RCE) was used, while to the electrochemical analysis, the electrochemical techniques like potentiodynamic Polarization Curves (PC) and Linear Polarization Resistance (RPL) were used. The obtained results shown that the corrosion system is limited by the mass transfer process, specifically the oxygen transfer from the bulk to the metallic surface, due to the momentum transfer, called “Convective Diffusion.” It is important to point out that this diffusion can modify the electrochemical reactions (incrementing of redox reactions), so the stability of the corrosion products films adsorbed on metallic surface are dependent to the shear stress and the aggressiveness of the medium.