Aluminium provides an ideal base for further finishing of goods in the form of a decorative coating. The size and range of surface finished products is vast - including goods in the packaging, mechanical engineering, transport, automotive, power, pharmaceutical, architectural, building, and domestic markets. Color addition is used for decorative, instructive and protective uses. All coatings may look similar at first glance, but there are many factors that will influence the lifespan of a good or bad surface finish over time. Surface quality is directly dependent on surface treatment, film thickness, process control and proved specified standards.
Anodizing is an electrochemical process that thickens and toughens the naturally occurring protective oxide layer in aluminium. Anodizing successfully combines science with nature to create one of the world's best metal finishes that is also environmentally safe. The resulting finish, depending on the process, is the second hardest substance known to man, second only to the diamond.
The anodic coating is part of the metal, but has a porous structure that allows secondary infusions (organic and inorganic coloring, etc.) Anodizing is commercially unique to aluminium and its alloys.
Main reasons for usage of anodic coating: (naslov 3)
- decoration, through a variety of colors
- a long-lasting appearance
- protection against weathering
- surface hardness
- abrasion and wear resistance
- reduction of friction and improvement of repellency
- improvement of adhesion of organic coatings (adhesives, varnish, paint)
- modification of electrical properties (insulation)
- modification of visual properties (reflectivity)
Powder coating is an advanced method of applying a decorative and protective finish to aluminium - creating a wide range of products that are used by both industries and consumers. The process result is a uniform, high quality and attractive finish. The powder coating industry is one of the fastest growing finishing technologies. Powder costs less to apply than equivalent performance liquid paint.
The following diagram describes a typical process for a powder coating line:
*Pre-treatment is done to remove impurities, conditioning the surface for optimum adhesion and obtaining uniformity