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Alodine® , which is also known as Iridite®, Chem Film or Chromate Conversion) is a chemical treatment process for aluminum used to provide corrosion protection and surface preparation for paint and adhesives. During the process, aluminum oxide and chromic oxide are produced.
All chromate conversion coatings use chromic acid in the form of its soluble salts. During the process, a thin, gel-like film is produced on the aluminum surface. Chromate is an excellent treatment method for paint or adhesives since it greatly enhances the product's ability to form a bond with the aluminum. It is frequently used on electrical and electronic equipment because it provides increased corrosion resistance while remaining electrically conductive. It is also often used on military weapons systems such as tanks, tubing, and component structures where paint finishes are required for the interior surfaces but not the exterior surfaces.
The oxide films produced by this process vary in color from clear to iridescent yellow or brown depending on the aluminum alloy being treated, surface conditions, and the type of chromate.
Alodine is applied without the use of electricity so it is typically a very cost effective primer base prior to applying paint
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