This paper is devoted to the description of magnetic field effects on zinc electrodeposition from basic media. The major effect of the magnetic field stems from a slight magnetohydrodynamic forced convection located close to the cathodic interface. Classical impedance analysis reveals that the reaction mechanism is governed by two diffusing species, Zn(II) and OH-, the contributions of which have been discerned. This leads to a good agreement between experimental and theoretical impedance diagrams and shows, once again, that the magnetic field exerts no effect upon the transfer kinetics.