What are the surface treatments of aluminum alloy?

Mosi Li
Mosi Li

Director Project Engineer at 3Q Machining - China top CNC Machining Custom Part Manufacturer

What Are The Surface Treatments Of Aluminum Alloy?

Aluminum alloy can be heat treated or surface treatment to obtain good corrosion resistance, What are the main surface treatments for a aluminum alloy part?

What Are The Surface Treatments Of Aluminum Alloy?

Aluminum Alloy is easy to do surface treatment to Solve or improve the performance of materials in three aspects: anti-corrosion, decoration and functionality, Common aluminum alloy surface treatments include electroplating, spraying, wire drawing, anode, sandblasting, passivation, polishing, oxide film treatment, etc.

(1) Sandblasting:

The main function is surface cleaning. Sandblasting before painting (painting or plastic spraying) can increase the surface roughness and contribute to the improvement of adhesion.

(2) Passivation:

It is a method to transform the metal surface into a state that is not easy to be oxidized, and to delay the corrosion rate of the metal.

(3) Coloring:

There are two main processes for coloring aluminum: one is aluminum oxidation coloring process, and the other is aluminum electrophoresis coloring process.

(4) Chemical polishing:

A chemical processing method that uses the selective self-dissolution of aluminum and aluminum alloys in acid or alkaline electrolyte solutions to level and polish the surface of the year to reduce the surface roughness and PH.

(5) Chemical oxidation:

The oxide film is thin, with a thickness of about 0.5-4 microns, and is porous, soft, and has good adsorption properties. It can be used as the bottom layer of organic coatings, but its wear resistance and corrosion resistance are not as good as anodized film

(6) Spraying:

The external protection and decoration of equipment are usually carried out on the basis of oxidation.

(7) Electrochemical oxidation:

The chemical oxidation treatment equipment for aluminum and aluminum alloys is simple, easy to operate, high in production efficiency, does not consume electric power, has a wide range of applications, and is not limited by the size and shape of the parts.

(8) Anodizing:

It is the process of plating a thin layer of other metals or alloys on the surface of certain metals using the principle of electrolysis. Brush plating is used for partial plating or repair.

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