Frequently Asked Questions


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What is anodizing?

Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of aluminum. The process is called "anodizing" because during the process the aluminum forms the anode electrode of an electrical circuit. Anodizing increases corrosion resistance and wear resistance, and provides better adhesion for paint primers and glues than bare aluminum. Anodic films can also be used for a number of different cosmetic effects; either with thick porous coatings that can absorb dyes, or with thin transparent coatings that add interference effects to reflected light.

What materials can you anodize?

The following aluminum alloys: 2000 series, 3000 series, 5000 series, 6000 series, and 7000 series. Please call us at (773) 533-3737 to inquire about aluminum castings.

Are there minimum lot fees?

Yes. Chicago Anodizing imposes different lot fees for different process:

Clear Anodizing Mil-A-8625 Type II Class 1: $150.00
Color Anodizing Mil-A-8625 Type II Class 2: $175.00
Hardcoat Anodizing Mil-A-8625 Type III Class 1: $225.00
Hardcoat Anodizing (Color) Mil-A-8625 Type III Class 2: $275.00
Chromate Conversion Mil-C-5541: $125.00
Bright Dip An additional charge of: $100.00
Polishing/Buffing   Please call for a quote

Can you send me some samples of your work?

Yes, upon request we can send out samples. Please email with your name, address, and any inquiries.

What is your turnaround time?

We are open five days a week, 24 hours a day. Our standard turnaround time is 5 business days. Next day service is available upon request.

What is Bulk Anodizing?

Usually used in the Screw and Fastener Industry, Bulk Anodizing is an inexpensive although functional alternative to location and rack anodizing. It gives the customer an opportunity to run high volumes of pieces at much more affordable pricing. Chicago Anodizing is a leading supplier for bulk and barrel anodizing. Available in all colors, for both bright and satin finishes. Please call with any inquiries.

What Markets do you service?

  • Agriculture
  • Aerospace
  • Architectual
  • Automation
  • Automotive
  • Communications
  • Cookware
  • Electronics
  • Fasteners
  • Firearm
  • Food Service and Storage
  • Mascara and Make-up
  • Medical
  • OEM
  • Ordinance
  • Recreational
  • Safety
  • Tool Storage