April 8, 2020

What Are Some of the Finishing Options for Heat Sink Manufacturing?

There are two components to a surface finish for any aluminum heat sink manufacturing processes. The texture of the finish and the exterior coating or protectant for the surface.

Surface Finish Textures

There are several different types of surface texture finishes available:

Brushed Texture

The surface of the heat sink receives a unidirectional satin finish by polishing the metal. It is easy to see the pattern of fine parallel lines in the finish.

brushed texture for heat sink design

Polished Texture

The surface of the heat sink is polished to a bright shine.

polished texture for heat sink design

Bead Blast Texture

A bead blast texture is a uniform texture with low gloss that has less reflectivity.

bead blast texture for heat sink design

Sand Blast Texture

This texture creates a uniform, matte finish for the heat sink.

sand blast texture for heat sink design

Machined Finish Texture

The texture of this finish is determined by the type of machine working on the metal.

machined texture for heat sink design

Exterior Coatings and Protectants

Applying exterior coatings and protectants is the final step in the finishing process. Painting is the simplest exterior coating available, but here are some other coatings and protectants that can be used for aluminum heat sink designs.

Anodize Finishes

Anodizing is an electrochemical process that creates a durable corrosion-resistant finish by dipping it into an acid electrolyte bath and then applying electrical current to it. This bonds to the aluminum itself, creating a surface that can’t peel or chip and can have additional processes applied to it.

Clear Chromate Finishes

This is also an electrochemical process that applies a chromate conversion coating to aluminum alloys to serve as a decorative finish or retain the electrical conductivity of the aluminum heat sink.

Powder Coating

This process uses a dry powder that is applied using an electrostatic charge and then cured using heat. This powder is typically a thermoplastic or thermoset polymer designed to create a finish that is more durable than paint.

Electroless Nickel Plating

This chemical process does not require a current like those of electrochemical processes such as anodized and clear chromate finishes. Electroless nickel plating creates an even layer of metal over any surface. However, in order to nickel plate aluminum, you need to silver plate the part first.

Getec Provides Numerous Options for Finishing Heat Sink Designs

Getec offers a multitude of surface finish textures and various exterior coatings and protectants. These coatings include anodize finishes such as MIL-A-8625, Type I, Type II, and Type III (Hard Anodize) and Class 1 Non-Dyed, and Class 2 Dyed (black, blue, red, and green). We also provide clear chromate, powder coating, electroless nickel plate and painted finishes for our aluminum products and heat sinks. For more information give us a call at 888-999-8499, contact us online, or send us an email at sales@getecna.com today.