CR3+ PASSIVATION (ADL-32) – WITH COOLING BATH

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.

The product creates a thin transformation film on the zinc surface, reducing white rust , increasing corrosion resistance, and meeting the trend of replacing Chromium VI (Cr6+) technology with environmentally friendly solutions.

Developed by AD Chemicals (Netherlands) , the ADL-32 passivation product for hot-dip galvanizing is suitable for modern HDG lines that want to improve product quality without major equipment changes.

Key Benefits Of ADL-32

• Chromium III (Cr3+) technology does not contain Cr(VI).
• Use directly in the Quench Tank; no separate passivation tank is required.
• Reduce the risk of white rust formation during storage and transportation.
• Increase the corrosion resistance of galvanized steel products.
• Low investment cost, easy integration into existing production lines.
• In line with green production trends and export requirements.

Specifications

ADL-32 Usage Procedure

The passivation chemical for hot-dip galvanizing, ADL-32, is added directly to the Quench Tank, combining the cooling and passivation processes in a single step, thus simplifying the production process.

                                                                            ADL-32 passivation process

When Should You Choose ADL-32?

Passivation for hot-dip galvanizing – ADL-32 is a suitable option when businesses:

• Quench Tanks are already present in the HDG production line.
• I want to upgrade from Cr(VI) technology to Cr3+.
• The phenomenon of White Rust needs to be limited.
• We want to optimize investment costs.
• No intention of renovating or adding a separate passivation tank.

If a business wants to separate the passivation process, then it should use ADL-3P or Spray Passivation.

Comparison Of Passivation Products For Hot-Dip Galvanizing

Corrosion Resistance Test Results

1. Neutral Salt Spray (NSS) Testing

The ADL-32 passivation for hot-dip galvanizing has been tested according to high quality standards for the hot-dip galvanizing industry.

The test results showed that:

• Superior corrosion resistance.
• The White Rust phenomenon is effectively controlled.
• The surface remained clean and stable after testing.

The image shows that the surface behind the NSS remains clean, with high white rust protection.

2. 24-hour Humidity Test:

24-hour humidity tests showed that the ADL-32 passivation layer performed stably and provided good protection to galvanized steel surfaces.

After the testing process:

• The surface remains bright and clean.
• No premature oxidation occurred.
• No white corrosion marks form.

Moisture test results showed that ADL-32 maintained a stable surface, without premature corrosion or white spots forming.

Comparison Of ADL-32 Passivation With Chromium(VI) Chromate Technology

Learn More

1. 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 .

2. 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.

3. 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.

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