Douglas Finishing utilizes a trivalent version of this process that is RoHS compliant.
Chromate Conversion Coating (Iridite or Alodine) per MIL-DTL-5541
Chem Film is a chemical conversion coating that is used to passivate aluminum. It provides minimal corrosion protection for aluminum and is also used as an adhesion enhancing step prior to powder coating aluminum. We can coat parts as large as 78″ long x 80″ deep x 22″ wide.