CATAPHORESIS PAINTING

The cataphoresis process is today considered the most modern and technological treatment in the field of industrial painting capable of giving iron, steel, alloys and, in general, conductive metals considerable resistance to corrosion and attacks by chemical and atmospheric agents; cataphoresis painting is characterized by the uniform deposit of an epoxy resin on the surface of the products which guarantees high resistance to corrosion over time and better adhesion of the finishing paints.

The processing takes place by hanging the material to be treated on special customized frames which are in turn fixed to an automatic handling system which will guide it through the treatment phases: degreasing, pickling, phosphating, passivation, rinsing and paint deposition through an electrochemical process.

The parameters of the entire process are decided based on the type of material, the morphology of the pieces and what is foreseen in the specifications agreed with the customer; all data is recorded, stored for 10 years (or possibly for the times agreed with the customer) and protected by daily backup.


STANDARD PRE-TREATMENT AND DEPOSITION CYCLE

Position 1: Spray alkaline degreasing. Temperature: 45°- 60°C
Position 2: Alkaline degreasing by submersion. Temperature 45°- 60°C
Position 3: Alkaline degreasing by submersion. Temperature 50°- 60°C
Position 4: Rinsing by submersion. Room temperature
Position 5: Rinsing by submersion. Room temperature
Position 6: Acid hot pickling. Temperature 45°- 50°C
Position 7: Rinsing. Room temperaturePosition 8: Micronized zinc activation. Room temperature
Position 9: Micronized salt zinc phosphate treatment by submersion. Temperature 30°-40°C
Position 10: Rinsing by submersion. Room temperature
Position 11: Demineralised water rinsing. Room temperature
Position 12: Aluminium passivation bath. Room temperature.
Position 13: Treatment with film-coating nanotech agent with passivating effect zirconium + Cr III by submersion. Room temperature
Position 14: Demineralised water rinsing. Room temperature.
Position 15: Cataphoresis bath.
Position 16: Ultrafiltrate bath 1.
Position 17: Ultrafiltrate bath 2.
Position 18: Blowing chamber.
Position 19: Manual blowing.
Position 20: Drying. Temperature 50°- 100°C
Position 21: Drying oven, reticulation, firing. Temperature 170°C, 85 min.
Position 22: Cooling.

The cycle is completely modifiable in order to offer the possibility of adapting the treatment to any request from the customer.

The final part of the treatment involves cooking in the oven for 85 minutes. at a temperature of approximately 170°C, this phase is aimed at ensuring the correct polymerization and cross-linking of the paint film.

After cooling, the material is unloaded, visually inspected and packaged as agreed with the customer.

The quality of the process is kept under control thanks to our internal laboratory used to verify the treatment parameters and the characteristics/performances of the film applied with instruments such as conductivity meter, PH meter, fluorometer, spectrophotometer, cross-cut cutter (adhesion test), thickness gauge and chamber for NS tests (ISO 9227 – ASTM B117).

Masking

Masking is an operation required if there is a need to protect any areas from treatment, for example threaded holes or functional assembly areas.

The material used is designed to guarantee total coverage of any product, to resist high temperatures and to avoid the deposition of any residues (e.g. glue) which could affect subsequent processing.