Revêtement de conversion au chromate

Chromate conversion coating is a chemical treatment that forms a passive, corrosion-resistant layer on aluminum and similar metals. It works by reacting the base metal with a chromium-based solution, creating a thin film that protects against oxidation and enhances adhesion for secondary coatings like paint or powder.

Sometimes referred to as chemical film or Alodine, this treatment is widely trusted in high-performance environments where both corrosion resistance and electrical conductivity are essential.

Process Steps – How It’s Applied

At Yicen Machining, the chromate coating process is carefully controlled to meet MIL-DTL-5541 Type I and Type II standards:

• Degreasing & Cleaning
  Surfaces are thoroughly cleaned to remove oil, dirt, and oxides.
• Etching (optional)
  Parts may be lightly etched to improve film bonding.
• Chemical Application
  Components are immersed or sprayed with the chromate solution.
• Rinse & Dry
  The part is rinsed with deionized water and air-dried, leaving a uniform protective film.

This coating is applied at micron-level thickness, ensuring full protection without affecting precision features.

Why Choose Chromate Conversion Coating?

Yicen Machining delivers high-quality chromate coatings that provide:

• Long-Term Corrosion Resistance
  Shields aluminum from oxidation in industrial and marine environments.
• Preserved Electrical Conductivity
  Ensures continuity for grounding, shielding, and electrical pathways.
• Excellent Primer Compatibility
  Ideal surface preparation for painting or powder coating.
• Minimal Dimensional Change
  Extremely thin layer keeps tight tolerances intact.
• Field Repairable
  Damaged areas can be spot-treated without stripping the entire part.
• Aesthetic Versatility
  Offers both matte-clear and iridescent yellow finishes.

Suitable Materials

Chromate conversion coating is most effective on:

• Aluminum & Aluminum Alloys
  (6061, 5052, 7075, etc.)
• Zinc and Zinc-Plated Parts
• Magnesium Alloys
  (with appropriate pre-treatment)

If your project involves aluminum parts exposed to moisture, chemicals, or electrical systems, chromate coating is a smart, reliable solution.

Where It’s Used

Thanks to its protective and conductive properties, chromate conversion is widely used in:

• Aerospace:
  Interior/exterior airframe parts, brackets, and housings
• Defense & Military:
  Tactical electronics, armor components, and communication gear
• Electronics Manufacturing:
  RF enclosures, connectors, and shielding panels
• Automotive & EV Systems:
  Lightweight aluminum components and battery enclosures
• Marine Applications:
  Corrosion-prone parts used in coastal or saltwater environments

Why Work with Yicen Machining?

We integrate CNC precision machining and MIL-spec finishing under one roof, giving you a streamlined path from prototype to production:

• Certified MIL-DTL-5541 Type I & II Processes
• Both Trivalent (RoHS-compliant) and Hexavalent Options
• In-house Process Monitoring for Consistent Results
• Flexible Production Volumes – Prototypes to High Runs
• Fast Turnaround & Quality Assurance Included

Let us help you protect and prepare your parts with confidence.

Request a Quote Today

Chromate conversion coating from Yicen Machining delivers proven corrosion resistance, paint readiness, and electrical conductivity—essential for performance-critical components. Whether you’re building for aerospace, defense, or electronics, our finishing experts are ready to support your next project.

Request your quote today and discover how Yicen Machining can elevate your aluminum parts’ performance.