Duplex system

A duplex system combines the corrosion protection provided by hot-dip galvanizing with an additional coating, usually a powder coating or paint. This combination unites the advantages of both processes: the cathodic protection and barrier effect of the zinc as well as the chemical and mechanical resistance of the top coat.

Hot-dip galvanizing initially provides comprehensive basic corrosion protection by applying a layer of zinc to the metal. This layer protects against environmental influences and provides protection even in damaged areas by forming a galvanic cell. The additional coating is then applied to further strengthen the protection and extend the service life of the structure.

Another advantage of the duplex system is the ability to meet aesthetic requirements through coloring. This combination also reduces maintenance and servicing costs in the long term, as it offers greater resistance to aggressive media such as salty air or chemicals. The Duplex system is particularly popular in demanding applications such as bridge construction, façades and industrial plants.