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Chemical Film/Alodine Alodine 1200, Alodine 600, Iridite 14-2 MIL-C-5541 Classes 1A and III; and AMS 2473 Chemical Film or Chromate Conversion Coating on Aluminum is a surface treatment which enhances the corrosion resistance of aluminum. Although it appears to be one of the simpler processes, it has the most names and specifications. In addition to maximize the corrosion resistance of chemical film, certain pretreatment and post treatment steps are of the utmost importance. Passing salt spray testing can be tricky without proper knowledge. Chemical film is used for corrosion resistance and a paint base. When electrical conductivity and corrosion resistance are both required, chem film is a good choice. The coating comes in both iridescent yellow and clear colors; however, it should be noted that the yellow gives superior corrosion resistance. The lighter color gives lower electrical resistance. It should also be noted that chemical film is fragile directly after processing and a 24 hour waiting time before handling the parts is preferrable. Temperatures over 120 F will also break down the corrosion resistance of the coating. In comparison to anodizing the chemical film is fragile and it is not fit for high use areas as the coating can be easily damaged. Frequently Asked Questions Does chemical film add thickness? No, chemical film is a surface treatment and it will not build up. It should be noted that some companies will heavily etch the surface for cleaning before processing. If you have close tolerances, please let the operator know so he will not etch off too much material. Names for Chemical Film Generic Names Chemical Film
Proprietary Names Alodine - product of Henkel Technologies
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