Effects of Magnetic Field on Corrosion Rate and Anodic Current Density ofAxel Steel in NaCl Solution

The effects of magnetic field on the corrosion rate and anodic current density of axle steel in naturally aerated NaCl solution were studied by polarization curve and potentiostatic polarization. The results showed that the magnetic field had a significant acceleration effect on the corrosion rate of the sample in a short immersion period, while the effect of the magnetic field was weakened in a long immersion period. The magnetic field caused the self-corrosion potential of the sample to shift positively, which reduced the current density at the beginning of the anodic polarization curve. When the constant potential polarization was carried out in the linear range of the anodic polarization curve, the current density could reach a steady state after a period of polarization at a lower potential, while the current density increased sharply and then decreased linearly at a higher potential. After the magnetic field was applied, the anode current density increased slightly, indicating that the electrode reaction rate during polarization at this potential was not controlled by the mass transfer process of charged ions leaving the electrode surface.