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Chromium(VI)- free; based on chromium trivalaent
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For direct use in the quench tank (cooling bath)
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Superb white rust protection
Passivation for Quench Tank Chromefree HDG ADL-32 is free of chromium(VI). It is a water-based trivalent chrome passivation to be applied op freshly galvanized steel surfaces. It offers “white rust” corrosion protection properties that exceed current alternative chromefree passivations.
Contact
Need process advice? Ask Roland van Meer (Sales Director)
+31 (0) 167 526 900
Passivation ADL32 – for direct use Quench Tank
Developed to meet the needs of the hot-dip-galvanizing (HDG) industry. Ensuring excellent white rust protection and easy bath control.
Passivation ADL-32 product characteristics:
- Can be used directly in the quench tank, no cooling bath needed
- At a higher concentration also suitable for passivation in a cooling bath
- Passivation layer on fresh galvanized steel
- Chrome(III) chemical technology
- Protection against white rust
- Provides bare corrosion resistance during storage and transport
- Outperforms other Chrome (VI) free products
- Free of substances of very high concern
Test Results
Passivation ADL-32 has been tested according to the highest quality standards. Below pictures show test results before and after NSS with Passivation ADl-32. 
Test Results Humidity
Passivation ADL-32 test results for 24-hours of humidity testing.
Passivation ADL-32 v.s. Chromate passivation
The following table shows an overview comparison between Passivation ADL-32 and a traditional chromate (hexavelent) based passivation.
| Chromate conversion coating | Passivation ADL 32 | |
|---|---|---|
| Environmental impact | -/- | ++ |
| Passivation performance (white rust prevention) | ++ | ++ |
| Chemical basis | chromium(VI), toxic | chrome(III) |
| Robust and easy to handle proces | ++ | ++ |
| Meets quality standards | Yes, industry standard | Yes, meets the quality standards |
| Direct use in quench tank | YES | YES |
| Use after cooling bath (first cooling than passivation) | YES | YES |
| Appearance | yellow, clear layer | clear layer |
| Waste water treatment | Multiple steps, chrome reduction required | Regular waste water treatment |
| Easy to strip passivation of substrate when needed? | NO | YES |
| Pricing | € | €€ slightly more expensive |
Exceeding the market standard
HDG passivations have a huge range of requirements on a complex combination of zinc based alloys. This drives the need for close working relationships, consultation, testing and pilot line experimentation. With its passivation portfilio AD shows that replacing chromium-6 while maintaining the highest quality is possible.
Discover more
Passivation HDG
Passivation products of AD are sustainable (free of chrome-6), economic and effective in use. If needed AD Chemicals can tailor the passivation requirements to the specific substrate and application process of a customer.
Passivation ADL-3P
Passivation ADL-3P is free of chromium(VI). It is a water-based trivalent chrome passivation to be applied op freshly galvanized steel surfaces.
Spray Passivation
Traditional passivation methods require a dedicated immersion bath in the quenching or cooling stage. This spray technology provides a solution for galvanizers looking to upgrade their corrosion protection capabilities without major process modifications or investments.
Related articles:
Other AD Metal Surface Treatment solutions
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