In the bath of the whole copper roller, copper should be a frequently increasing impurity, which is similar to that of iron and other metals. It will reduce the conductivity of the solution, leading to a narrowing of the bright chromium layer in the area and a significant decrease in the coating ability. Moreover, because the roller belongs to the inner hole part, during the plating, the chromic acid solution appears oxidation after being eroded, and the plating solution causes contamination.

But if the copper impurities in the roller in quality, its concentration is relatively high, then the bath liquid temperature will not change, under normal circumstances, the current can be directly adjusted in the density, so the impact on the coating will not be large, the main is also the concentration of the quality can be adjusted.

Design is to roll on the quality of the concentration of impurity is reduced, and improved the quality of the coating, but, for copper impurities on the quality of concentration also need effective control, this for the whole TongGun tube manufacturing, factors is important to note, so everyone at the time of manufacture cannot careless.

The accumulation of impurities on the copper roller can be ensured and the bath life can be extended by:

1. Directly apply insulating paint film on the inside of the roller and electroplate it again after a certain period of drying. This film effectively inhibits the oxidation and erosion of chromic acid on the inner wall of copper;

Two, the roller fixture is good use of iron materials for manufacturing, if both ends of the plywood and the center of the fixed screw is necessary to set, then do not choose copper;

Three, if the roller manufacturing process, suddenly appear in the middle of the phenomenon of power failure, then must be directly out of the plating, to prevent a longer period of immersion in the bath, and lead to oxidation of the copper matrix;

Four, the roll of copper plating chromium must ensure that is charged into the tank, if need to carry on the plating, so the strict use of anode for related any processing, good is the use of small current density, cathode for activation treatment, after completely reach the normal current density, can be carried out on the roller plating processing.