Ultrasonic degreasing for galvanic, painting, polishing compounds, polishing metals
One of the most relevant concerns for every galvanic treatment is the extreme cleaning of surface grease, oils, dust, abrasives and all components which could prevent the perfect adherence of metal coatings, with subsequent flaking.
In the final phase, the surfaces of the parts to be treated must have an almost “mirror-like” polish.
Polishing is then performed, meaning the surfaces are brushed with felt impregnated with vegetable or animal fat and abrasives (e.g.: corundum, alumina, Tripoli powder, etc.)
Upon termination of this operation, the grease thickens together with residual dust and hides in every indentation. This must be completely removed but is difficult to eliminate using a electrolytic degreaser (cathodic or anodic).
At this point, ultrasonic cleaning systems have proven themselves to be irreplaceable, and the most economical solution for removing polishing pastes
SUBMERSIBLE TRANSDUCERS are installed in the bath to bring the ultrasonic action directly in proximity to the parts, inevitably removing all the dirt in a short period of time.
Which liquid to use for removing polishing pastes?
SUPERIORITY OF WATER-BASED DETERGENTS COMPARED TO ORGANIC SOLVENTS
The removal of polishing pastes is the most immediate problem in preparation for the subsequent processes of electrodeposition, electroplating, powder coating, PVD or vacuum metalisation.
The effect of ultrasonic cleaning with water-based detergents literally causes the grease, which is hidden and esterified, to explode in the detergent solution.
Even abrasives (alumina, corundum and Tripoli powder, etc.), freed from the grease which held them like glue, are released from the surface of the piece and fall to the bottom of the tank.
When cleaning polishing pastes, the use of a water-based detergent is much more efficient and economical, and is preferable compared to degreasing with organic solvents.
In fact, solvents dilute the grease of the paste without eliminating it, and as long as the solvent is clean, the result may be acceptable. However, over time solvents become contaminated with grease and the result worsens.
To maintain an acceptable result, a solvent based system must perform a continuous closed distillation cycle which results in the significant problem of energy consumption.
But even more serious is the problem of environmental pollution. Not to mention the disposal of exhausted solvents.
Moreover, at the end of cleaning with a solvent, the surface of the treated part shows signs of the typical residues of inorganic particulate.
It is precisely because they are inorganic, that they have not dissolved in the organic solvent and remain on the surface of the part, making it necessary to later remove the residue manually (polishing).
FOR YEARS, MORONI HAS ONLY MANUFACTURED SYSTEMS WHICH CLEAN WITH WATER-BASED DETERGENTS.
