Chromate Conversion (aka Alodine® or Iridite®) is a chemical treatment process for aluminum used to provide corrosion protection and surface preparation for paint and adhesives.
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.
The oxide films produced by this process vary in color, depending on the aluminum alloy being treated, surface conditions, and the type of chromate.
1. Alodine resists corrosion. Our test results on 6061 aluminum indicated that the Alodine treated surface withstood corrosion in a five percent salt spray test for 168 hours. Results do vary depending on the alloy of the material and the surface finish. We recommend that you submit a sample of the alloy and a description of the finish you intend to use. It will be processed and returned to you for evaluation.
2. Alodine is an excellent paint base. Since the coating is not applied electrically and can be applied quickly, Alodine is one of the most cost effective ways to provide a suitable primer base prior to applying Paint.
3. Alodine is decorative. Alodine has a light gold to dark gold appearance depending on your individual preferences.Capacities
Our current size limits are:
- Alodine 1200 - 9.9' x 2.5' x 3'
- Alodine 600 - 4' x 2.5' x 2.5'
- Clear Alodine 1500 - 3' x 3' x 3'
- RoHS compliant Alodine - 4' x 2' x 3'
Alodine processing can only be applied to aluminum alloys. Although most aluminum alloys can be processed, those with a low copper content (less than 3.5%) and a low silicon content (less than 5%) are recommended.
We've found the best results occur on 6061, 6262 and 7075 wrought alloys;Dissimilar Materials
Aluminum parts which have dissimilar materials installed in them such as
steel helicoils, bushings, dowel pins, ect. can be processed with a lesser degree of risk than our other processes, However we recommend installing them after processing to reduce the risk of damage caused by chemicals used for processing. Parts processed with dissimilar materials are processed only at the customers risk.
Some of the specifications utilized by Poly-Metal Finishing Inc. are MIL-C-5541, MIL-DTL-5541, AMS2473, SS8486, BAC5719, HS240, HP4-57 to name a few.