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Chemical Film/Chromate Conversion (Alodine®/Iridite®) Services

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Chemical Film/Chromate Conversion Services

Chemical Film or Chromate Conversion is widely used plating for the protection on aluminum and is also known by brand names Alodine® and Irridite®. Chemical Film is a chemical process that produces a protective chromate conversion film on aluminum and aluminum alloys. The coating can be applied on the aluminum surface, with or without color, to form a surface corrosion resistant film when it is dried. The darker coatings provide the greatest corrosion protection. Customers usually specify either "clear" (meaning with no color) or "gold". The Classification per Mil-C-5541 is determined by the exposure to time of the aluminum part to the Chemical Film solution.

TWR offers both Traditional hexavalent chemical Film and RoHS Hex Free Chemical Film Coatings on a production basis. The process we use is The IRIDITE NCP®, Non Chrome Passivate. This process has been developed in response to the ELV, RoHS and WEEE directives. The IRIDITE NCP® does not contain Lead, Cadmium, Chromium (hexavalent or trivalent), Mercury or PBB/PBDE compounds. IRIDITE NCP® is an environmentally friendly chemical process that produces a protective conversion coating on aluminum and it's alloys. The coating can be used as a finial finish or can also serve as a base for paints, high performance topcoats, powder coats, lacquers, or as a base for rubber bonding. It can also be used in conjunction with masking of an anodized finish for conductivity properties.  IRIDITE NCP® Coating color is always a clear coat.


  • Conversion Coatings are Economical
  • They are easy to use and offer a variety of valuable properties to extend the service life of parts
  • Minimize Surface Oxidation of Aluminum Parts
  • Very Thin Coating: No Dimensional Change
  • Primer for Paint Adhesion and other topcoats

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Chemical Film/Chromate Conversion Services Capabilities

Specification ASTM B449
Substrates Aluminum & Aluminum Alloys
Plating Type Hexavalent
RoHS Hex Free
Plating Process IRIDITE NCP® (Non Chrome Passivate)
Finishes Hexavalent - Clear or Yellow
RoHS Hex- Free - Clear
Applications Conversion coatings provide corrosion protection and used as a paint base.
Quality Assurance Mil-C-45662
Mil-I-45208 with the inspection schedules in accordance with Mil Std.105
Order Quantity From single-quantity/prototype to production orders
Typical Lead Time 3 Working Days ARO Standard
Expedited Same Day Service (On Request)

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