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) , ADL-3P 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 containing ADL-3P 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?

ADL-3P is a passivation product for hot-dip galvanizing, 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)

Learn More

1. Surface Treatment Solutions Before Painting

PreCoat Z31 – a complete surface treatment system based on Chromium(III) technology , providing superior corrosion resistance and paint adhesion while being completely free of Chromium(VI). Specifically, using PreCoat Z31 will optimize paint performance and the long-term durability of the coating.

2. Spray Passivation Solution

The unique spray passivation solution allows for direct treatment on galvanized steel surfaces without the need for traditional dipping tanks. This technology offers high flexibility and easy integration into any galvanizing line without requiring major infrastructure changes.

3. Passivation for Hot-Dip Galvanizing – ADL-32

ADL-32 is a Chromium III (Cr3+) passivation chemical for hot-dip galvanized steel (HDG), used directly in the Quench Tank after the galvanizing process.

4. Passivation of Chrome III (Cr3+)

 PrimeCoat® Z80x Series is a line of chemicals developed using Phosphate/Silane technology to provide high corrosion protection while meeting the trend of environmentally friendly production. PrimeCoat® Z80x is developed to replace passivation systems using Chromium VI (Cr⁶⁺), helping businesses transition to chrome-free technology while maintaining effective surface protection and corrosion resistance in a wide range of industrial applications.

5. Pre-treatment Chemicals

PrimeCoat® A109 is a water-based, chrome-free  metal surface pretreatment chemical  manufactured using advanced nanotechnology. It is an effective alternative to traditional chromate pretreatment systems, specifically developed for aluminum coils and cold-rolled steel. The product can replace traditional non-washing chromate pretreatment systems while still ensuring the necessary corrosion protection and adhesion to metal surfaces.

6. Specialized Information

We constantly update our articles and industry news to provide information that meets the needs of each customer.

Value Added From DK-CHEMICLAS

In addition to supplying AD CHEMICALS surface treatment chemicals, DK CHEMICALS also supports customers in optimizing production processes and improving line operational efficiency.

Key features include:

• In-depth technical consulting . 
• Optimize production costs .
• Improve product quality.
• Reduce the error rate in production .
• Increase competitiveness in the market.
• Support the deployment of environmentally friendly technologies. 

DK CHEMICALS ‘ team of experts  has practical experience in continuous production lines, helping customers choose the most suitable solution for each type of material and specific technical requirement. Contact us for expert 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