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Chem Film

Chem Film Coatings, (also known as Chromate Conversion, Alodine or Iridite) are a chemical conversion coating that is used to passivate aluminum. It is intended to improve adhesion of paint finishes and other coatings, as a corrosion inhibitor, providing less corrosion resistance than other finishes such as anodizing. It also serves as a base for organic coatings while leaving dimensions unchanged. The most commonly referred–to-standard for applying chromate conversion coatings to aluminum is MIL-DTL 5541. Chromate conversion coatings are easily recognized by their distinctively greenish-yellow color on gold chem film and no color for clear chem film.

Elite Metal Finishing provides Chem Film Coatings in three variations:

  • Type I Gold (Class 1A and Class 3)
  • Type I Clear (Class 3)
  • Type II RoHS Compliant (Class 1A and Class 3)

Advantages of Chem Film Coatings:

  • They provide valuable properties that extend the service life of parts
  • Minimal surface oxidation of aluminum parts
  • Conversion coatings are both cost efficient and economical
  • It is an ideal “surface treatment” for paint adhesion and other coatings
  • Does not change part dimensions

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