Magnetic Field Effect on Dissolution of Iron Plate in Hydrochloric Acid

Abstract

The effect of magnetic field on the dissolution of ir on plate in a hydrochloric acid solution has been studied by the measurement of the dissolution rate for 24 hours at 25°C with batch method. The magnetic field effect was dependent on the experimental conditions: When magnetic flux density of 0.15 T was applied, the dissolution was retarded in the solutions below 2.5 mol·dm^-3 hydrochloric acid, but accelerated in the solutions above 2.5 mol·dm^-3. Dependence of corrosion potentials and corrosion current densities on the hydrochloric acid concentration showed analogous behavior. The magnetic field effect was independent of crystal faces of the iron plate and of the magnetic flux density between 0.07 and O.15 T. The magnetic field affected the anodic reaction(Fe→Fe(II) +2 e) remarkably and promoted the oxidation of Fe(II) to Fe(III) in the hydrochloric acid solution.