Effect of Magnetic Field on Corrosion Behavior of L360 Pipeline Steel and Welded Joints in 3.5％NaCl Solution
To clarify the influence of magnetic fields on the corrosion behavior of oil pipelines of L360 steel in service,the corrosion behavior of L360 pipeline steel and its welded joints in 3.5％NaCl solution by applied magnetic field of various intensities was studied via electrochemical tests and corrosion mor-phology characterization.The results indicate that as the magnetic field intensity increases,the charge transfer resistance of L360 pipeline steel and its welded joints initially increases and then decreases,while the corrosion current density initially decreases and then increases.Corrosion is inhibited by a low-er intensity magnetic field(60 mT),while it is accelerated by a higher intensity magnetic field(120 mT).Moreover,by the same applied magnetic field intensity,the corrosion rate of the welded joints is higher than that of the base metal.It is proposed that the existed gradient magnetic field force may be favor the adsorption of metal ions at the electrode interface,resulting in the formation of a corrosion product film that hinders the corrosion process.Under the influence of a high-intensity magnetic field,the Lorentz force can disrupt the corrosion product film,accelerating ion diffusion and subsequently accelerating the corrosion of the steel.
magnetic fieldL360 pipeline steelwelded joint3.5％NaCl solutioncorrosion behavior
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