  We describe the ``electrolubrication'' occurring in liquid mixtures confined
between two charged surfaces. For a mixture of two liquids, the effective
viscosity decreases markedly in the presence of a field. The origin of this
reduction is field-induced phase separation, leading to the formation of two
low-viscosity lubrication layers at the surfaces. These layers facilitate
larger strain at a given stress. The effect is strong if the viscosities of the
two liquids are sufficiently different, the volume fraction of the less viscous
liquid is small, the gap between the surfaces is small, and the applied
potential is large. The phase separation relies on the existence of dissociated
ions in the solution. The effective viscosity is reduced by a factor $\alpha$;
its maximum value is the ratio between the viscosities of the two liquids. In
most liquids, $\alpha \sim1 $ -- $10$, and in mixtures of water and glycerol
$\alpha \sim 80$ -- $100$ under relatively small potentials.
