TRIVALENT (NON-HEX)
CHROMATE / CONVERSION COATING

WHAT IS CONVERSION COATING?

Trivalent chromate or conversion coating is a chemical process used to enhance the corrosion resistance of metals, primarily aluminum, zinc, and their alloys. The process forms a protective oxide layer that guards against environmental damage, improves paint or coating adhesion, and provides a uniform finish. This method is commonly used in industries such as aerospace, automotive, and electronics, where reliable corrosion protection and high-performance coatings are critical.

Our process meets MIL Spec MIL-DTL-5541 Type II Class 1A and Class 3 —
Delivering numerous benefits!

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- Corrosion resistance: Protects metals from rust and oxidation.
- Improved adhesion: Enhances bonding for paints, powders, and other topcoats.
- Environmentally friendly: Meets RoHS compliance, reducing toxic byproducts.
- Durability: Extends the service life of parts in challenging environments.
- Conductivity: Retains electrical conductivity, making it suitable for electronic components.
- Aesthetic improvement: Offers a uniform, attractive finish
- Cleaning:
  - Remove dirt, grease, and contaminants from the metal surface using alkaline or acid-based cleaners.
- Rinsing:
  - Rinse the part with clean water to eliminate cleaning residues and prevent contamination during coating.
- Conversion Coating Application:
  - Immerse the part in or spray it with a trivalent chromate solution.
  - Allow sufficient time for the chemical reaction to form the protective oxide layer.
- Rinsing:
  - Perform a secondary rinse to remove excess chemicals and ensure uniform coating.
- Drying:
  - Dry the part using air or heat to set the coating and prepare it for further processing.
- Inspection:
  - Examine the coated surface for consistency, coverage, and adherence to quality standards.
- Optional Post-Processing:
  - Apply additional finishes or treatments, such as painting or anodizing, if required.