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Chromium(VI)- free; based on chromium trivalaent
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For use in the cooling bath
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Superb white rust protection
Passivation for Cooling Bath Chromefree ADL-3P 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.
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Passivation for Cooling Bath Chromefree ADL-3P product overview
Developed based on the needs of the galvanizing industry ensuring high performance and easy bath maintanance.
Passivation ADL-3P product properties:
- Passivation to be used after the cooling bath. See below process.
- Passivation layer on fresh galvanized steel
- Chrome trivalent, water based chemical
- Protection against white rust
- Provides bare corrosion protection during storage and transport
- Perfect alternative for hexavalent based processes
- Free of SVHC substances
Test Results
Passivation ADL-3P has been tested according to the highest quality standards. Below pictures show test results before and after NSS with Passivation ADl-3P. 
Test Results Humidity
Passivation ADL-3P test results for 24-hours of humidity testing.
Passivation ADL-3P v.s. Chromate passivation
The following table shows an overview comparison between Passivation ADL-3P and a traditional chrome(VI) based passivation.
| Chromate conversion coating | Passivation ADL-3P | |
|---|---|---|
| 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 | NO |
| 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.
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-32
Direct use in quench tank. Passivation ADL-32 is free of chromium(VI). It is a water-based trivalent chrome passivation to be applied op freshly galvanized steel surfaces.
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