Chemical Conversion Coating – Hexavalent

Chromate conversion

Finish Name

Chemical Conversion Coating – Hexavalent
Hexavalent Yellow Chromate
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 (trade names) 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 at the same time when low electrical resistance is needed.  

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

 

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
Yellow

Specification

MIL-C-5541/MIL-DTL-5541 Classes 1A & 3, Types 1 and 2
MIL-C-5541
AMS-2473
AMS-2474
AMS-2477
ASTM-B-449 Classes 1, 2, 3, 4

Accreditations

Nadcap

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.
  • Excellent corrosion protection.
  • Salt spray hours from 72 to 120 depending on the part and alloy.