Chromate Conversion Coating Aluminum

Arrow Cryogenics offers Trivalent Chromate Conversion coating for aluminum parts and components. Our chromate conversion coating meets mil spec MIL-DLT-5541 Type II Class 1A and Class 3. The coating materials we use are licensed from the U.S. Navy under U.S. patents.

Chromate Conversion Coatings for Metal Parts

Chromate conversion coating is a chemical immersion process that is used to passivate aluminum, steel, zinc, cadmium, copper, silver, magnesium, and tin alloys. This low-cost process is primarily used as a corrosion inhibitor and as a primer for paint, lacquer, or rubber bonding. Chromate conversion coatings also maintain exceptional electrical conductivity retention. The environmentally friendly chromate conversion coatings meet mil spec MIL-DLT-5541 Type II Class 1A and Class 3.

The Trivalent Chromate Coating Process

Chromate conversion coatings are created through a passivation process. This method renders the coated surface structure chemically inactive. A complex metal-chrome molecule film then forms around the metal, which eventually forms into a continuous gelatinous coating. This type of gelatinous coating effectively eliminates the chemical reaction process, which is what causes corrosion. Chromate conversion coatings provide continuous corrosion protection to the metal on which it is applied.

Trivalent Chromate Conversion coating is used as a replacement for hexavalent chromium.

Arrow Cryogenics uses a unique chemical solution for our chromate conversion coatings. As specified by the above-mentioned mil spec, Arrow Cryogenics' chromate conversion coatings contain no hexavalent chromium, and form a clear, iridescent film on treated parts.

Chromate conversion coatings have been in use since at least the 1960s; however, the hexavalent chromium chemicals used have been found to be highly toxic. As a result, governmental regulations restricting the amount of hexavalent chromium in coatings have been enacted. RoHS is a common reference point for the elimination of hexavalent chromium. Trivalent chromate conversion coatings, using non-toxic, non-hexavalent chromium, are now used almost universally as a replacement.

Arrow Cryogenics uses a unique chemical solution for our chromate conversion coatings. Our conversion coatings are hexavalent free and are compliant with RoHS and WEEE directives. Arrow Cryogenics is also ISO 9001:2000 certified.

Industries benefiting from Chromate Conversion Coatings include, but are not limited to:

  • Automotive
  • Aviation & Aerospace
  • Buildings & Architecture
  • Electronics
  • Marine
  • Medical/Dental Equipment
  • Military/Law Enforcement
  • Sporting Goods

NADCAP Certified

Arrow Cryogenics is Nadcap certified for chemical processing and is in compliance with the AC7004 Aerospace Quality System for the Aircraft, Space and Defense Industry. As part of Nadcap accreditation, our processes were audited based on stringent industry guidelines and are regularly reviewed to maintain compliance.

Contact us to learn more about our Nadcap certification or to discuss finishing services for your aerospace application.

Contact Arrow Cryogenics today for more information about our trivalent chromate conversion coatings for aluminum.