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What materials can be anodized?

August 11, 2023

Anodizing is a surface treatment method that forms an oxide layer on a metal surface through an electrochemical reaction. It is mainly suitable for aluminum and its alloy materials. The following are some common materials that can be anodized:

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Aluminum (Al): Aluminum is the most commonly anodized material. It has good oxidation properties and can form a hard, wear-resistant and corrosion-resistant oxide layer. Anodized aluminum has better decoration, weather resistance and insulation.


Aluminum alloys: In addition to pure aluminum, many aluminum alloys can also be anodized. Common ones include aluminum-silicon alloys, aluminum-magnesium alloys, and aluminum-manganese alloys. Anodizing properties and color may vary with different alloys.


Magnesium (Mg): Magnesium can also be anodized, but compared with aluminum, magnesium has poor oxidation performance and tends to produce an uneven oxide layer. Therefore, more stringent control conditions are required during the anodic oxidation of magnesium.


It should be noted that not all metals can be anodized. For example, metals such as steel and stainless steel are not suitable for anodizing because their oxide layers are poor and prone to corrosion.


In addition, special pretreatment methods, such as passivation treatment, can be used to form a thinner oxide layer on the surface of some other metals to improve their corrosion resistance.