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Let Us Analyze If You Should Anodize


Anodizing is an electro-chemical process that forms a durable, porous oxide film on the surface of aluminum extrusions, adding to the protection provided by its natural oxide layer. Anodizing is where the aluminum extruded profile is immersed in a tank containing an acid-based electrolyte. A current is passed through the solution, carefully controlling the temperature of the electrolyte. The aluminum extruded profile serves as the anode, so the electrolyte releases oxygen ions at the surface of the profile. The oxygen immediately combines with the surface aluminum to form a hard aluminum oxide film.

Hardcoating / Hard Anodizing

Hardcoating, or hard anodizing, is a modification of sulfuric anodizing, performed at high current densities and low temperatures. Sometimes additives are mixed into the electrolyte to produce a denser, more abrasion-resistant oxide film, imparting high wear resistance to the product.

Reasons to Anodize Aluminum Extrusions

  • Improved overall appearance
  • Corrosion resistance
  • Abrasion resistance
  • Wear resistance
  • Enhanced heat dissipation
  • Increased lubricity
  • Dielectric strength
  • Color stability
  • Ease of maintenance
  • Aesthetics and appearance

Anodizing Colors

Black, clear, blue, red, pewter*, gold*, purple*, grey*, green*

*Supplier base

Give us a call today! Our anodizing experts serve on industry committees, and bring a level of experience that many in the industry are not able to provide. You can learn more about anodizing and other chemical finishes available by checking out our white paper on this topic.

"Engineering support during the quoting process was excellent. Other suppliers who quoted the same job talked about tolerances, but Alexandria Industries was the only one to provide marked-up prints with specific tolerances. This was key in finishing the design and making the extrusion fit with mating components."

LED Component Engineering Manager
Leading Global LED Manufacturer