How to get different colors for aluminium extrusions

Aluminium extrusions are available in a variety of colours and stylish appearances. So how does it get its colour?

Today let Hugh Aluminium take you through the processes used to obtain colour on the surface of aluminium extrusion:

1. anodising:

Anodising is an electrolytic oxidation process that produces an oxide film on the surface of aluminium and its alloys. This oxide film has the effect of protecting the aluminium from corrosion and also enhances the wear resistance and hardness of the aluminium.

Aluminium extrusion after passing through anodic oxidation. It can obtain various colours. Common colours include black, gold, bronze, brown, etc.

Colour treatment is usually achieved by immersion in a solution containing dyes. The dye molecules penetrate and adsorb onto the oxide film, creating a long-lasting colour.

Belows is the aluminium extrusion Anodising process from Hugh aluminum：

2. Powder Coating (or Electrostatic Coating)

Powder coating is a technique in which a dry powder coating is uniformly applied to the surface of an aluminium extrusion by electrostatic action. The coating powder is attracted to the aluminium extrusion by the electrostatic action and then cured by heat to form a hard, abrasion and corrosion resistant coating. o Powder coating can be achieved in a wide range of colours.

Powder coating can achieve a variety of colour customization, from the common white, black, grey, to a variety of bright colours, and can even be sprayed with a metallic texture.

3. Fluorocarbon Coating:

• Fluorocarbon coating is an advanced surface treatment technology.
• Fluorocarbon resin coating is used to spray on the surface of aluminium extrusion.
• This coating has excellent weathering, corrosion, chemical resistance and self-cleaning properties and is particularly suitable for aluminium extrusions used outdoors.
• Fluorocarbon coating also allows for a wide range of custom colours, from muted shades to vibrant colours.

4. Wood grain transfer:

Wood grain transfer is a technique that simulates the texture of wood and creates a realistic wood grain effect on the surface of aluminium profiles.

By printing the pattern with wood grain on the transfer paper. The transfer paper is then applied to the surface of the aluminium extrusion, after heat and pressure. The pattern is transferred to the aluminium extrusion to form a long-lasting wood texture effect.

5. anodic electrophoresis:

The principle of anodic electrophoresis is an electrochemical process in which particulate matter is deposited on a conductive substrate. In this process, the aluminium extrusion acts as an anode and when an electric current is passed through it, an oxidation reaction occurs on its surface.A thin film with a positive charge is formed.

This film attracts negatively charged particulate matter, such as pigment particles, and causes them to be deposited on the surface of the aluminium extrusion. This results in a uniform, dense, coloured coating.

All of these methods can give aluminium extrusions a different appearance. The project builder can tailor it to his architectural needs. The project builder can propose these processes to the aluminium extruder to get beautiful colours.

Hugh Aluminum is an aluminium extrusion factory with anodic oxidation, powder coating, anodic electrophoresis and PVDF capabilities.

We are able to satisfy our customers’ needs for the diverse appearance of aluminium profiles.

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