The effect of a uniform static magnetic field on processes occurring at Cu/acidified CuSO4 interfaces is examined by analysis of potentiodynamic polarization curves. The mass transport controlled deposition current is increased by as much as a factor of 2 in a 0.6 T field, independent of field direction and electrode orientation. The extent of current enhancement is greatest at low pH (<1), where it is associated with diffusional rather than migrational transport of the copper ions. (C) 1998 American Institute of Physics. [S0021-8979(98)38711-3].