Anodizing 101

Anodizing with Aluproteck

With over 30 years in the industry, we have worked with some of the world’s leading architects, product designers, engineers and fabricators, creating new and exciting products as well as building designs that not only better our lives, but visually inspire us.
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How anodizing works



The purpose of the cleaner is to remove grease, dirt, and oils from the surface of the material. A well cleaned surface will ensure there is no foreign substance that will react with the rest of the anodizing line.


The etch process is designed to dissolve a thin layer on the surface of the aluminum resulting in a smooth uniform matte finish. The etch can also be used to chemically mill parts and remove minor surface defects. Aluproteck offers both a caustic etch and an acid etch depending on the client’s specifications.


This step is accomplished by immersing the material into an acid electrolyte bath and passing an electric current through the medium. A cathode is mounted to the inside of the anodizing tank; the aluminum acts as an anode, so that oxygen ions are released from the electrolyte to combine with the aluminum atoms at the surface of the material being anodized.The anodizing film is controlled by the current and time, so proper contact is very important.


At this stage, AC power is used to deposit tin metal into the material. Deposition takes place at the bottom of the pore. The intensity of the color is dependent on the amount of tin deposited and the packing density. Depending on the desired outcome, the material will transform from champagne to bronze to black and pass every shade in between.


Finally, the material is sealed in an elevated temperature hydrothermal seal. This last step is critical to ensure stain resistance and corrosion protection. The sealer ensures the anodized finish will maintain its luster and durability for years to come. The anodized aluminum is then rinsed and is moved to the unload station where quality and packaging specifications are verified.

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Perfect for LEED Certification

While it’s buildings themselves that get LEED certified, it’s the products used in those buildings that go towards qualifying for points. Anodized surfaces are an excellent choice for exterior product applications in which the architect is looking to maximize the building efficiency while avoiding negative impacts on the environment. The anodized aluminum used in a project today is 100% recyclable tomorrow. Anodized aluminum products do not outgas or emit toxic fumes like other coated materials. The anodizing process is 100% natural and will not negatively impact air quality. These factors all contribute to the awarding of LEED points in various categories, making it an ideal material to work with.

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Applications for Anodized Aluminium

-Exterior Applications

  • Curtain wall
  • Commercial windows/doors
  • Composite/honeycomb/insulated panels
  • Rain screens
  • Column covers
  • Screens
  • Garage doors
  • Awnings
  • Car ports
  • Patio covers
  • And more

+Interior Applications

  • Ceiling panels and grids
  • Air vents and duct covers
  • Column covers
  • Laminate panels
  • Store signage
  • Produce doors
  • Door hardware
  • Shelving brackets
  • Elevator and kiosk panels
  • Desks
  • Trade booths
  • and more
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Why choose anodizing over paint finishing?

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Resistant to UV

Easy to maintain

Outdoor use

High traffic areas

Colour options

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