INCREASED CORROSION PROTECTION
Aluminum profiles provide increased protection against corrosion, specifically filiform corrosion. This can be obtained by means of pre-anodization and subsequent powder coating. These methods are mainly applied where adverse environmental conditions necessitate a higher form of corrosion protection.
A distinction between the traditional coating system and a duplex process is made for steal parts. The traditional coating system consists of a base coat, at least one intermediate coat, and a top coat. The base coat is used for corrosion protection and promotes adhesion between the surface to be coated and the intermediate coating. It takes over through pigmentation (e.g. zinc-rich primer) of the fundamental corrosion protection.
The intermediate coating increases the corrosion protection effect (high layer thickness) and balances out irregularities in thickness. The number of intermediate coatings depends on the requirements for the overall coating. The top coat is responsible for optical properties such as color, gloss, and reflectivity. It is also the first line of defense against UV radiation, corrosive atmospheres, chemicals, and/or abrasions.
In addition to traditional coating, duplex systems have their own significant features regarding corrosion protection. They are attained by hot dip galvanization in combination with a coating system, which provides a much greater period of protection.
Proper adhesion of the coating with hot dip galvanization is assumed.