Alodine 4830/4831

Passivation for Aluminium

- Liquid, Chrome-Free 2 Component Product -

Properties and

Application Fields: Alodine 4830 and Alodine 4831 are fluid components for a passivation treatment. Mixed with water they produce colourless conversion layers on aluminium and its alloys in immersion and spray application. These provide a corrosion resistance as well as very good adhesion properties for subsequent painting.

Process Components: Alodine 4830

Alodine 4831

Make-Up: For each 1.000 l of bath add

Alodine 4830 (immersion) 10 - 15 l

Alodine 4830 (spray)  3 - 8 l

Alodine 4831 11 - 13 l

to the DI-water whilst stirring.

Summary of the

Process Parameters: Changes in the following process parameters may be necessary and depend on local conditions.

Control Points: Free Acid 9 - 11 ml

Temperature 15 - 40 ¡ãC

Time 30 - 60 s

Spray Pressure 0.5 - 1.5 bar

Process Sequence: 1. Clean/Etch

2. Rinse

3. Deoxidizing

4. Rinse

5. Rinse with DI-Water

6. Passivation (with  AlodineTM 4830/4831)

7. Dry*

* In some cases an additional Fog Stage or air nozzles have to be installed prior to drying.

Bath Maintenance: The Alodine 4830/4831-bath is controlled by determination of the free acidity. Iron ions in the bath may interfere with coating quality. Maximum iron content: 10 ppm.