Surface treatment

There are two main reasons for surface treating of aluminium extrusions; for aesthetic purposes or to give the surface special properties. Some of the properties that can be changed and improved by surface treatment are corrosion resistance, surface structure, hardness, wear, reflectivity and and electrical insulation capacity. HAP has resources for all current methods for surface treatment of aluminium extrusions.


Anodizing creates a hard surface combining good protection against mechanical wear with elegant finish. Anodizing is an electrochemical process that artificially thickens the natural, transparent film of aluminium oxide integrated on the surface of the aluminium.

While the natural oxide film is only 0.2 microns, after anodizing the film commonly ranges in thickness from 5 microns to 25 microns depending on the desired application requirements. With the anodizing process, aluminium’s natural colour (naturally anodized) can be retained or a colour from a wide range of alternatives can be chosen.


Powder Coating

The powder coating of aluminium extrusions is a solvent-free and environmentally friendly painting method used usually for decorative reasons, but can also provide additional corrosion protection, temperature resistance and insulation.

The laquering of aluminium extrusions is mainly done by powder coating in vertical or horisontal spray booths. We have resources for powder coating in all colours.


Other methods of surface treatment

Special surface finishes can be achieved by mechanical treatment such as polishing and brushing. These methods remove all small faults on the surface, give a uniform surface and make further treatment possible to give a reflective or decorative surface.


Using chemical surface treatment methods (etching, brightening, cromating, plating with copper, nickel, silver etc ) f. e. reflective and conductivity properties can be changed.

Other examples of surface treatment are screen printing on extrusions and application of protecting foils.