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*Not complete listing of available specs. Contact us for review and confirmation of your specification

NADCAP Specifications

  • MIL-C-5541
  • MIL-DTL-5541
  • 580-0036
  • AMS 2473
  • 580-0034 (Copper Only)

NON-NADCAP Specifications

  • 001-0187
  • 9904151
  • 9904159
  • MIL-DTL-81706
  • M690278

NADCAP Specifications

  • MIL-C-5541
  • MIL-DTL-5541
  • AMS 2473
  • 580-0036

NON-NADCAP Specifications

CHROMATE CONVERSION COAT

Also referred to as chem film, alodine and iridite. Chromate conversion is a thin coating that can be used as a final finish or as a primer to paints and adhesives. During the chem film process, the surface of the metal undergoes a chemical reaction that gives a general, light protection of a substrate against oxidation that does not dimensionally alter the part.

  • Corrosion Inhibitor

  • Abrasion Resistant

  • Tarnish Resistant

  • Conductive

  • Solderable

  • Aluminum

  • Copper

TYPES OF CHEMICAL CONVERSIONS

The most common chem film spec is MIL-DTL-5541. MIL-DTL-5541 contains the option for type I, a clear or yellow hexavalent chromate, or type II, a clear hexavalent-free (trivalent) chromate, on aluminum and class 1A or class 3. Class 1A is a thicker and darker coating that provides a high-grade corrosion protection as a final finish to the aluminum and improves the adhesion of a paint finish. Class 3 is a thinner, lighter weight coating that allows the aluminum substrate to retain its conductivity while maintaining corrosion protection.

A clear hexavalent chromate is available for copper substrates as a tarnish resistant film.

A part with chromate conversion

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