Corrosion of Nickel Aluminium Bronze - Effect of a Uniform Magnetic Field

摘要

The effect of a uniform magnetic field on the corrosion rate of anodically polarized Ni-AI Bronze in 3,5 wt.% NaCI has been investigated. It was found that the anodic current density increased when magnetic fields of 300 and 1000 mT was applied to the system. The effect was attributed to the Lorentz force, increasing convection and thereby mass transport in the diffusion layer. The relative increase in anodic current density depended on both the polarization potential and the strength of the magnetic field. The highest effect was found for NAB polarized 180 mV in the anodic direction, where the anodic current density increased with 55 % when a magnetic field of 1000 mT was applied parallel to the corroding surface. The results establish that a uniform, static magnetic field may increase the corrosion rate on anodically polarized NAB in stagnant seawater.