Enhancing Your Aluminium Extrusions with These Different Types of Finishes​

For your aluminium windows, doors, curtain walling, or cladding, finishes are very important as they enhance your aluminium extrusions with these different types.

 

Mechanical Finishes

 

Buffed, blasted, polished, grinded, or sanded aluminium finishes can improve surface quality or prepare the aluminum for other cosmetic finishes.

 

Mill Finish: This standard finish of aluminium comes out of the mill with a wide range of uses and applications. The mill finish is the natural state of aluminium as no mechanical or chemical finishing was added to the surface.

 

Brushed Finish: This finish offers aluminium a distinctive look with a pattern of very fine lines parallel to the brushing direction. It is commonly used in decorative applications and popular in small appliances and whiteware, and also features largely in architecture and automotive design.

 

Pretreatment

 

After the aluminum is either etched or cleaned with alkaline or acidic materials, a pretreatment coating is applied to enhance powder or paint adhesion and to provide resistance against corrosion.

 

Bright Dipping

 

The electro-brightening treatment offers an extremely high luster on aluminium, which is always performed on raw aluminium. The harder tempered the alloy is, the brighter product will result. This bright dip aluminium can achieve the high luster from smoothening the aluminium surface at the microscopic level. As bright dipping does not remove scratches or lines from the aluminium alloy, profiles can also be anodized, thickening the metal corrosion-resistant oxide layer after bright dipping.

 

Anodising

 

This electrochemical process offers additional protection aside with the natural oxide film. Depending on the method, the original oxide layer will be taken off and a new oxide layer with the desired colour and thickness will be applied. Anodising also offers an excellent for durability, fade resistance, and abrasion resistance than other finishes.

 

Liquid Paint

 

They come in many colors, offer a uniform film thickness, and generally contain volatile organic compounds (VOCs). Liquid Paints are driven off during the curing or baking process. Solids form a film on the extrusion when the VOCs are gone the volume.

 

Powder Coating

 

Powder coating is a multi-stage process to create a durable film or coating on the aluminium surface. It offers a virtually unlimited choice of colours and is also very durable.

 

The aluminium is pre-treated to clean. An electro-statically charged powder is sprayed in the spray booths and attracted to the face of the aluminium to form an even coating. Then, it moves to a curing oven in order to melt or cure the charged powder to get an even paint coating with 60 microns thickness. As the powder coatings leave behind a film that can meet stringent performance criteria and do not contain VOCs, it is ideal for meeting environmental regulations on VOCs.

 

PVDF

 

PVDF finishes are mostly carried out on steel and steel panels. It has a wide colour range, fade resistance, and excellent durability. But, PVDF does Pperform as well like anodised finishes in abrasion resistance, formability, and small batch orders. Their maintenance and repair are also fairly easy to carry out.

 

Sources

https://www.aluminiumtrading.co.za/aluminium-surface-finishes

https://sppcltd.co.uk/2014/12/different-types-aluminium-finishes

https://www.gabrian.com/6-types-of-finishes-for-extruded-aluminum

 02-winwall_co_th-HMKK

Winwall

+66 (0) 35-375-994-9​