Why is the aluminum heat sink anodized?

Aluminum is a material with good thermal conductivity, so it is mainly used to produce heatsinks. We generally call aluminum heatsink, where all the aluminum profiles refer to aluminum and contain aluminum alloy products.

Aluminum material is softer and less resistant to corrosion, so the aluminum heatsink will need surface treatment. Anodic oxidation is a common way of surface treatment.

Anodic oxidation usually refers to sulfuric acid anodic oxidation, which is forming a layer of oxide film on aluminum products (anode) under the action of applied current under the corresponding electrolyte and specific process conditions.

And this layer of oxide film makes the aluminum alloy surface hardness, wear-resistance, and other aspects of performance are enhanced, thus expanding the scope of application and extending the service life of aluminum radiator profiles.

In addition, the color of aluminum heatsink profiles will turn black after anodizing, so anodizing is also called the black anode or black oxidation.

The anodic oxidation of the aluminum heatsink can also increase the product's beauty. Many electronic products' substrate case is black. The black radiator can form a unified tone, increasing the beauty of the.

Some customers' water cold plate heatsink will also be anodized surface treatment, especially for lasers and other optical instruments above the water-cooling plate.