Precoating washing

For a good final coating, chemical pre-treatment of the surface is essential, which takes place in the spray tunnel.

For a normal steel surface:

• degreasing with water and acid solution at a temperature of 60 °;
• rinsing with continually refreshed water;
• phosphate at a temperature of 40 °;
• rinsing with continually refreshed water;
• rinsing with demineralised water.

For aluminium surfaces:

• degreasing with water and acid solution at a temperature of 60 °;
• rinsing with continually refreshed water;
• rinsing with demineralised water;
• zircon coating in tunnels with water and zirconium (chromium-free), the resulting conversion layer increases adhesion and corrosion resistance;
• rinsing with continually refreshed water;
• rinsing with demineralised water.

All for washing for coating equipment is automatically adjusted daily with sensor checks and calibration. The work piece is then dried with hot air and then moved to the coating booth.