Forming lubricants
Condoroil: electrolytic pickling tunnel for stainless steel tubes
On behalf of Siderinox, leading manufacturer of stainless steel welded pipe, located in Morimondo (I), Condoroil Stainless implemented a number (3) of plants electrolytic pickling ELECTRA series.
The welded tube, after checking with Eddycurrent, passes inside the treatment tunnel in which its surface is subjected to alternately anodic and cathodic currents that carry out the pickling action. In particular, the anodic section allows to solubilize both the oxides and the depleted chromium layer and to passivate the material, while the cathodic section helps the mechanical removal of the oxide producing an evolution of gas about 3 times higher than the anodic section.
The pickling tunnel is kept full of liquid due to the continuous supply of working solution. This is maintained at the correct working temperature through the use of a cooling circuit and a thermoregulated electrical resistance. The pickled tube is cleaned in the tunnel through three different stages of rinsing with water, fed and maintained in countercurrent. Also in this case the presence of water in the rinsing tunnel is ensured and guaranteed by special booster pumps.
The emissions are essentially composed of hydrogen and oxygen, an adequate suction will ensure the rapid dilution and evacuation of the same and a washing tower will eliminate any trace of any acid entrainment. We have also included in the cycle a reverse osmosis unit TAOS to keep clean the last rinse tank, thus avoiding the risk of having stains on the tube. The Taos unit also keeps clean water from the fumes washing tower avoiding its periodical replacement.
