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Anodize vs Alodine: What is the difference?

Anodizing and Alodining are both surface treatments that can be applied to aluminum to improve its corrosion resistance. However, there are some key differences between the two processes.


Anodizing is an electrolytic process that thickens the natural oxide layer on the surface of the aluminum. This creates a hard, durable layer that is resistant to corrosion, wear, and abrasion. Anodizing can also be used to produce a variety of colors and finishes.


Alodining is a chemical process that converts the surface of the aluminum into a thin layer of chromate. This layer is not as thick or durable as the anodized layer, but it is still effective at protecting the aluminum from corrosion. Alodining is also less expensive than anodizing.

Here is a table that summarizes the key differences between anodizing and Alodining:

Process typeElectrolyticChemical
Layer thickness1.8 to 25 microns0.5 to 1 micron
Corrosion resistanceExcellentGood
Wear resistanceExcellentGood
Abrasion resistanceExcellentGood
Color and finish optionsWide varietyLimited
CostExpensiveLess expensive

Which process is right for you?

The best process for you will depend on your specific needs and requirements. If you need the highest level of corrosion resistance, durability, and wear resistance, then anodizing is the best choice. However, if you are on a budget or need a quick turnaround time, then Alodining may be a better option.

Here are some general guidelines for choosing between anodizing and Alodining:

  • Anodizing is recommended for:
    • Applications where the aluminum will be exposed to harsh environments, such as marine or aerospace applications.
    • Applications where the aluminum needs to be highly resistant to wear and abrasion.
    • Applications where the aluminum needs to be available in a variety of colors and finishes.
  • Alodining is recommended for:
    • Applications where the aluminum needs to be protected from corrosion, but the highest level of durability and wear resistance is not required.
    • Applications where the aluminum is on a budget.
    • Applications where a quick turnaround time is required.

If you are still unsure which process is right for you, it is always best to consult with a professional.

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