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| - Magnetic Field Effects on the Open Circuit Potential of Ferromagnetic Electrodes inCorroding Solutions
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| - Magnetic fields shift the open circuit potential (OCP) of ferromagnetic electrodes (Fe, Co, and Ni) in corrodingsolutions. The OCP changes we observe (a) follow the series Fe>Co>Ni; (b) increase with the magnetic fluxdensity; (c) reach a maximum with disk electrodes approximately 1 mm in diameter; and (d) depend on theorientation of the electrode. We report that when the surface of the electrode is oriented parallel (θ = 90°)or perpendicular (θ = 0°) to the magnetic field, the open circuit potential moves in opposite directions (positiveand negative, respectively) with the largest changes occurring when the electrode surface is parallel to themagnetic field. Nonconvective sleeve electrodes produce the same behavior. The overall experimental evidencesuggests that the magnetic field changes the OCP by modifying the surface concentrations of the paramagneticparticipants in the corrosion process of the ferromagnetic electrode by species in solution; this in turn isaccomplished by imposing a field-gradient driven mode of mass transfer upon paramagnetic species in solution(magnetophoresis). Simulations of the magnetic field around the ferromagnetic electrode at the two extremeorientations considered here show that in one case (θ = 90°) field gradients actually repel, while in the othercase (θ = 0°) they attract paramagnetic species in the vicinity of the electrode.
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