Chromium(VI)- free; based on chromium trivalaent
For direct use in the quench tank or cooling bath
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.
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Passivation for Quench Tank Chromefree HDG ADL-32 at a glance
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
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
|Passivation performance (white rust prevention)
|Robust and easy to handle proces
|Meets quality standards
|Yes, industry standard
|Yes, meets the quality standards
|Direct use in quench tank
|Use after cooling bath (first cooling than passivation)
|yellow, clear layer
|Waste water treatment
|Multiple steps, chrome reduction required
|Regular waste water treatment
|Easy to strip passivation of substrate when needed?
|€€ 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 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 is free of chromium(VI). It is a water-based trivalent chrome passivation to be applied op freshly galvanized steel surfaces.