Chromate on Aluminum
Chromate on Aluminum
Chromate conversion coating of aluminum is a type of conversion coating applied to passivate aluminum
alloys to slow the formation of white corrosion.The process uses various chromium compounds which
may include hexavalent(Cr6) chromium or non-hexavalent(Cr3) chromium compounds. The industry has
developed non-hexavalent / trivalent less toxic alternatives in order to comply with the Restriction
of Hazardous Substances(RoHS) legislation. Chromate conversion coatings are commonly used on parts
in the aircraft industry and electronic cabinet and components industry, where it is often called
chemical film, or the well known brand names of Iridite or Alodine. It has additional value
as a primer for subsequent organic coatings, as untreated metal, especially aluminum, is difficult
to paint or glue. Chromated parts retain their electrical conductivity to varying degrees, depending
on coating thickness. The process may be used to add color for decorative or identification purposes.
DIFCO has both Barrel and Rack processes for chromate conversion coatings to meet the requirements of
Mil-C-5541 and most corporate specifications.
If your Metal Finishing requirements are:
* High Quality Plating
* Just In Time Delivery
* Competitive Pricing
* Other Added-Value Options
Please call us at 800-893-6214 and ask how we can "We Make Your Parts Look Better, Work Better & Last Longer"