PrimeCoat® Z838-4P – Chrome III Passivation Solution
PrimeCoat® Z838-4P is a water-based functional coating based on Chrome III (Cr3+) technology , developed for galvanized steel and zinc alloy substrates in continuous production lines.
PrimeCoat® Z838-4P is Chrome VI-free and fluoride-free. It is the ideal solution for businesses looking to replace traditional Cr(VI) technology, aiming for a higher-performance, safer surface treatment process that meets RoHS requirements.
Key Features of PrimeCoat® Z838-4P
Chrome III’s passive technology replaces Chrome VI.
PrimeCoat® Z838-4P uses Chromium III technology instead of Chromium VI. The product is Cr(VI)-free and fluoride-free, aligning with the trend of replacing traditional passivation systems with higher environmental and chemical safety risks.
- Does not contain Chrome VI.
- Passive mode based on Chrome III.
- Water-based Cr3+ surface treatment system.
- Fluoride-free.
- Meets RoHS requirements according to the technical documentation.
Increases corrosion resistance and reduces white rust.
Chrome III PrimeCoat® Z838-4P passivation enhances the protection of coated steel against moisture, condensation, storage conditions, transportation, and environmental impacts.
According to test data in the product documentation, the performance of ASTM B117 neutral salt spray coating on galvanized steel can range from approximately 96 hours to over 500 hours depending on the coating quantity. With a Galvalume base, the reference results are over 500 hours to over 750 hours, depending on the application conditions.
Suitable coatings to limit the appearance of white rust:
- Galvanized steel
- Galvalume.
- Galvannealed.
- Galfan.
- Alusi.
- Zinc-Aluminum-Magnesium alloy.
Reduce friction during the molding process.
PrimeCoat® Z838-4P provides effective surface lubrication, reducing friction between the steel sheet and the die during machining. Practical benefits include:
- Supports deep drawing and complex shaping.
- Reduces metal adhesion to the mold.
- Minimize galling during the shaping process.
- Reduces the risk of surface scratches.
- Helps extend mold lifespan.
- Increase the stability of the stamping and rolling processes.
According to the technical documentation, the reference friction coefficient of PrimeCoat® Z838-4P can reach approximately 0.21 at 21 mg Cr/m² and approximately 0.12 at 50 mg Cr/m² .
PrimeCoat Z838-4P Passivation Test Results
The table below summarizes the data in the PrimeCoat® Z838-4P document. Actual results may vary depending on the substrate material, coating thickness, coating amount, drying conditions, and test environment.
In the condensation test at 40°C, 99% relative humidity for 1,000 hours, quantitative levels of 20 mg Cr/m² or higher passed on galvanized steel substrates. On Galvalume substrates, levels of 30 mg Cr/m² or higher also passed according to the test table.
PrimeCoat® Z838-4P Applications in Industry
Galvanized steel sheets and steel coils industry
PrimeCoat® Z838-4P is used in continuous galvanized steel lines to protect the surface of galvanized steel during winding, storage, transportation, and subsequent processing.
Automotive industry
This solution is suitable for galvanized steel parts requiring deep drawing, forming, painting, or adhesive bonding, such as body parts, brackets, stamped components, and other metal parts requiring high corrosion resistance.
Household electrical appliances
The TOC coating helps prevent fingerprints, maintains the surface appearance, and enhances protection for the casings of refrigerators, washing machines, air conditioners, kitchen appliances, and exposed metal components.
Construction industry
PrimeCoat® Z838-4P is suitable for galvanized steel, panel sheets, metal doors, exterior roofs and cladding, galvanized steel structures, and products requiring corrosion protection during storage or long-term use.
Mechanical engineering and metalworking industry
This product assists in stamping, bending, rolling, and other processing operations requiring friction control, appearance control, and coating stability.
Learn More
1. 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 designed 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. The product meets RoHS and REACH standards , supporting businesses in reducing the use of hazardous chemicals and aligning with sustainable production practices.
2. Non-Chrome Passivation Solutions
Non-Chrome Passivation (Chrome-free Passivation) is a technology that creates a chemical conversion layer on metal surfaces without using any chromium compounds . This protective layer increases corrosion resistance, reduces white rust, and improves surface quality before machining or painting . The product contains absolutely no hexavalent chromium (Cr6+) or any other form of chromium, fully complying with international environmental standards such as RoHS and REACH.
3. Solvent-Replacing Cleaning Agents
MM31® was developed to optimize the entire surface treatment process before and after mechanical machining. After treatment with MM31®, the metal surface is not only completely clean but also forms a conversion coating that offers many benefits such as: increased paint adhesion, resulting in better paint bonding to the metal substrate; reduced peeling during use; improved corrosion resistance, providing better protection against moisture and harsh environments; and reduced rust.
4. Specialized Information
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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
