Chemical Conversion Treatment Coating

Chromate conversion
Finish Name
Chemical Conversion Treatment Coating
Chromate Coating
Chem Film
Chromate Conversion Coating
Alodine (trade name)
Iridite (trade name)
Benefit

Chromate conversion coatings are also called chemical film coatings, or  Alodine or Irridite (tradenames) coatings. They produce a very thin protective coating. Used mainly on aluminum or aluminum alloys, chemical conversion coating provides a protective layer against corrosion and can be used as a primer for paint.  Extra benefits accrue when the coating is sealed. This coating can be used for protection when low electrical resistance is needed.  

 

Suitable for
Castings
Stamping
Machine from solid
Industry use
Aerospace
Militiary and Defense
Automotive
Various
Base metal substrate
Aluminum and Zinc Die Cast
Aluminum Die Casting
Zinc Die Casting
Effect
Paint base
Electrical conductivity
Anti-corrosion seal
Clear or yellow
Trivalent Clear
Specification
MIL-C-5541/MIL-DTL-5541 Classes 1A & 3, Types 1 and 2
MIL-C-5541
AMS-2473
AMS-2474
ASM-2477
ASTM-B-449 Classes 1, 2, 3, 4
Accreditations
Nadcap
Chromate conversion picture1

Features of Chemical Conversion Coating:

  • Provides corrosion resistance on aluminum sheet, extrusions, forgings and aluminum sand or die-castings.
  • Inexpensive in all applications.
  • When specified, provides nearly zero electrical resistance.
  • Excellent base for paint.
  • Prolongs shelf life and resists staining and fingerprinting.
  • Provides super corrosion resistance on all aluminum products by addition of seal.
  • Clear to light in appearance.
  • Excellent corrosion protection.
  • Salt spray hours from 72 to 120 depending on the part and alloy.

In addition, Erie Plating provides both hexavalent and trivalent chromate conversion. Trivalent chromate conversion coatings are nontoxic, RoHS-compliant alternative to hexavalent chromate conversion coatings.