Continuous strip electroplating appts. - in which strip is turned about its longitudinal axis to achieve more uniform plating

摘要

A continuous metal strip electroplating device consists of a tank which contains two anode boxes at its sides and spaced sink rolls above its bottom. Above the tank and along its centreline is a device for reversing the direction of the strip together with a coiler and decoiler. The improvement is that the strip is turned about its longitudinal axis (pref. by an angle of 45-135 deg.) during its passage between the sink rolls and the direction- reversing device. This is pref. achieved by inclining the sink rolls at about 45 deg. to the centreline of the direction-reversing device. The appts. is useful for nickel plating steel strip for use in Ni-Cd accumulators. The invention avoids preferential nickel plating at the strip edges so that the plating thickness only varies from 0.8 to 1.1 microns compared with from 0.66 to 1.5 microns for appts. This allows higher current densities to be used.