Chromate Conversion

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Chromate Conversion coatings are non-decorative coatings intended to provide corrosion prevention when left unpainted. It also improves adhesion of paint and finish systems on aluminum and aluminum alloys. Chromate solution is applied to clean aluminum and produces a thin gel-like film which is integrated into the metal. This film provides a superior base for bonding of paints and adhesives. It also lengthens the life of the paint, forming an effective barrier against corrosive pores or scratches that may occur. This process is also known as Alodine, Iridite, and Chem.-film. Apex also offers a chrome-free conversion coating that is ROHS compliant.

Locations providing Chromate Conversion

  • Portland
    Apex Anodizing (HQ)
    7015 NE Columbia Blvd.
    Portland, OR 97218
  • Sparks
    280 Coney Island Dr, Suite B
    Sparks, NV 89431

Chromate Conversion details

Note: tank sizes and max part sizes listed only apply to our Portland facility. Please call (775) 355-8121 for tank size details at our Sparks facility.
Tank size and max part size details for Chromate Conversion
Process Max Tank Size Max Part Size
Trivalent Clear Chromate 72” x 48” x 48” 72” x 48” x 48”
Hexavalent Clear Chromate 72” x 48” x 48” 72” x 48” x 48”
Hexavalent Yellow Chromate 72” x 48” x 48” 72” x 48” x 48”
Specification details for Chromate Conversion
Specification Type Specification
MIL SPECS Mil-DTL-5541 Type I
Mil-DTL-5541 Type I
Mil-DTL-5541 Type II
Mil-DTL-5541 Class 1a
Mil-DTL-5541 Class 3
Mil-C-5541 Class 1a
Mil-C-5541 Class 3
Mil-C-81706 Class 1a
Mil-C-81706 Class 3
Mil-STD-171 7.3
Mil-STD-171 7.3.1
Mil-STD-171 7.3.2
Mil-STD-171 7.3.3
ASTM B449 Class 1
ASTM B449 Class 2
ASTM B449 Class 3