With all anodizing plants it is obviously desirable to introduce the current into the work being anodized with the minimum power losses, and apart from bus-bar, flight bar and jig design, this means good design of the contact system between the bus-bar and the flight bar or work rail.

Failure to take this into account can lead to serious overheating of the contacts and con­stant problems in achieving the anodizing results desired.

The greatest difficulty with such contacts is their maintenance, as they are nearly always affected by sulphuric acid fumes and spla­shes, and can become corroded or oxidized very quickly.

For this reason, it is good practice to make the contact as far outside the tank as possi­ble, but inevitably, this means longer flight bars and greater space needed. Contacts should also be as simple as possible so they can be easily cleaned.

To carry the current to the anodic bar on anodizing and electrocoluring tanks special pneumatic cylinders with magnetic contact are used.

They are complete with:

• N. 2 electric contacts made of copper bars with optional water cooling
• N. 1 AISI 304 stainless steel support
• N. 1 air pressure regulator
• N. 1 electrovalve for automatic operation
• N. 1 pneumatic cylinder (ISO standard)