1,Solutions for discoloration of copper belt
(1) Control the concentration of acid when pickling. In the case of annealed copper belt surface oxide layer washed away, acid concentration is high does not have any meaning. On the contrary, the concentration is high, attached to the surface of the copper tape residual acid is not easy to wash off, and accelerate the pollution of the cleaning water, resulting in high concentration of residual acid in the cleaning water, resulting in the cleaning of the copper tape is more prone to discoloration. Therefore, to determine the concentration of pickling solution, should follow this principle: under the premise of cleaning off the surface of the copper belt oxide layer, try to reduce its concentration.
(2) Control the conductivity of pure water. Control the conductivity of pure water, that is, control the content of chlorine ions and other harmful substances in pure water. It is generally safer to control the conductivity below 50μS/cm.
(3) Control of hot cleaning water and the conductivity of the passivator. Hot cleaning water, passivator conductivity increases mainly from the operation of the copper belt will be brought into the residual acid. Therefore, under the condition of ensuring the quality of cleaning water, control the conductivity, that is, control the amount of residual acid. According to many experiments, hot cleaning water and passivation agent conductivity were controlled below 200μS/cm is safe.
(4) Ensure that the copper strip is dry. Local closure at the exit of the air cushion furnace coiling, and the use of dehumidifiers and air conditioners within the local closure device, in order to control the humidity and temperature of the copper strip coiling within a certain range.
(5) Passivation using passivation agent. Now most copper processing plants use benzotriazole or BTA (molecular formula: C6H5N3) as a passivator. Practice has proved that it is an easy to use, economical and practical passivator. When the copper strip through the BTA solution, the surface of the oxide film and BTA complex reaction occurs, the formation of a dense complex, play a role in protecting the copper substrate.
2, copper strip shear indentation solution
To prevent the production of shear indentation, mainly according to the thickness of the strip, the degree of hardness and softness of the strip to choose a reasonable knife and rubber peeling ring of the outer diameter difference; rubber peeling ring of the hardness to meet the requirements of the use of the cut strip; when the width of the cut strip is smaller, should be a reasonable choice of the thickness of the knife, increase the width of the rubber peeling ring.
