Patent ID: 7560015

Claim:
Process for electrolytically coating a mould in which internal surfaces thereof demarcate a mould cavity having a generally rectangular cross-sectional shape when viewed in an axial direction, comprising: a. positioning an electrode in the mould cavity; whereby the electrode comprises an insoluble electrode having a same cross-sectional shape as the cross-sectional shape of the mould, b. sealing off the entire mould cavity with a head piece and a base piece positioned externally to said mould cavity with sealing elements on both front faces at the ends of the mould, whereby the head piece and the base piece each have at least one opening forming an intake and a discharge opening for introducing and discharging electrolyte, c. providing an electrical connection between the electrode and the mould; d. pumping electrolyte by a pump into the mould cavity and back to the pump, wherein the electrolyte is a sole supply of coating material; e. providing a current between the electrode and the mould cavity; and f. changing the current direction periodically, wherein the current-direction is changed intermittently to pulse deposit the coating material, and, g. coating the mould cavity over its entire length at one time with a substantially uniform thickness including the four corner regions of the mould cavity.