What is Passivation for Hot-Dip Galvanizing – ADL-3P?
ADL-3P is a Chromium III (Cr3+) passivation chemical for hot-dip galvanized (HDG) steel, used in a separate passivation tank after the cooling process.
The product creates a thin transformation film on the zinc surface, reducing white rust , enhancing corrosion resistance, and meeting the trend of replacing Chromium VI (Cr6+) technology with environmentally friendly solutions.
Developed by AD Chemicals (Netherlands) , this product is a suitable choice for HDG lines that want to individually control the passivation process to optimize surface quality and corrosion protection.
Key Benefits Of ADL-3P
Chromium III (Cr3+) technology, Cr(VI) free.
Used in a separate Passivation tank, the treatment process is easy to control.
Reduce the risk of white rust formation during storage and transportation.
Increase the corrosion resistance of galvanized steel products.
Suitable for production lines requiring separate passivation stages.
The product meets RosH & Reach standards – supporting businesses in meeting environmental and export requirements.
Specifications
Procedure for Using Passivation Agent ADL-3P for Hot-Dip Galvanizing
After the cooling process, the product is transferred to a Passivation bath to create a Chromium III conversion film on the zinc surface. This process improves resistance to white rust and increases the durability of the plating during storage, transportation, and use.
When Should You Choose ADL-3P?
This passivation product for hot-dip galvanizing is a suitable choice for businesses that:
- There is a separate passage tank after the cooling process.
- We want to independently control the passivation process.
- We want to improve the anti-corrosion properties of HDG products.
- We are currently transitioning from Cr(VI) technology to Chromium III (Cr3+).
- Environmental requirements and export standards must be met.
Test Results
ADL-3P has been evaluated through standard corrosion resistance tests on hot-dip galvanized steel.
Test results show that the Chromium III passivation coating improves resistance to white rust and maintains surface quality under real-world storage, transportation, and usage conditions.
NSS Results – Before & Post-Test Comparison
Humidity test results (24 hours)
The 24-hour humidity test results demonstrated that the passivation layer performed stably, maintaining a bright and clean surface without any signs of premature oxidation.
Comparison of ADL-3P Passivation and Traditional Chromate (Chrome VI)
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Frequently Asked Questions (FAQ)
In which process is the ADL-3P used?
The passivation chemical for hot-dip galvanizing is used in a separate Passivation Bath after the cooling stage to create a Chromium III passivation film on the galvanized steel surface.
Can ADL-3P replace Cr(VI) technology?
Yes. ADL-3P uses Chromium III (Cr3+) technology and was developed to replace passivation systems for hot-dip galvanizing using Chromium VI (Cr6+) technology.
Does ADL-3P help reduce white rust? Passivation for hot-dip galvanizing.
Yes. This product creates a conversion film that helps limit the appearance of white rust during storage, transportation, and use. Its effectiveness depends on the quality of the coating and the operating conditions of the production line.
What is the difference between ADL-3P and ADL-32? Passivation for hot-dip galvanizing.
This product is used in a separate passivation tank , suitable for production lines that want to individually control the passivation process.
Meanwhile, ADL-32 is used directly in the Quench Tank , combining cooling and passivation in a single process.
Does ADL-3P comply with current environmental standards?
Yes. This product does not contain Chromium VI and does not contain SVHC, aligning with environmentally friendly production trends and the requirements of many export markets.
DK-Chemicals: Metal surface pretreatment solutions for industry
DK-Chemicals provides chemical surface treatment solutions for metals serving the aluminum, galvanized sheet, color-coated steel, coil-coating, and related industrial applications.
With a focus on providing advanced, environmentally friendly technologies that meet modern production requirements, DK-Chemicals partners with customers in selecting suitable pre-treatment solutions, optimizing surface quality, and enhancing product durability after coating.
Contact DK Chemicals’ technical team today for detailed advice .
DK Chemical Company Limited
Address: 50 Street No. 12, Cityland Park Hills Residential Area, Go Vap Ward, Ho Chi Minh City
Hotline: 0909678599
Email: de@dk-chemicals.vn
