Référence
Pre-treatment of aluminum by DI water
The quality of the pre-treatment is critical to the final result of the powder coating process. The surface pre-treatment at Indulak in Denmark is handled in a 56 meter long spray tunnel. The treatment is done according to the GSB AL 631 standard. The aluminum workpieces go through the following treatment steps:
- Alkaline degreasing and etching at 55 °C
- Rinse
- DI rinse (deionized water with a conductivity less than 30 µS/cm)
- Chromium-free passivation
- Rinse
- DI rinse (deionized water with a conductivity less than 30 µS/cm)
The rinse water is lead through the line in a reverse cascade rinse to minimize the consumption of rinse water. Furthermore, the used rinse water is recycled over two parallel demineralizers to ensure continous operation. Fresh make-up water is added by reverse osmosis unit.
Reference ID: 134234
Industry: Industrie du traitement de surface
Application: Eau de rinçage
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Technical data
- Flow: recirculation: 1.7 m³/h
- Conductivity: <20 µS/cm
- Flow make-up water: 2.2 m³/h
Units in plant
- Activated carbon filter FNSA 130 SE20
- Demineralization units 2 x EMHE 602 SE30
- Softening unit type SM 62-F
- Reverse osmosis unit type RO B1-6 SE30
- 1100 litre storage tank