Duplex System for corrosion protection employed in Cologne

The newly opened Rheinboulevard on the banks of the River Rhine in the Deutz district of Cologne has been transformed into a stage where real life happens. Stretching out your legs with a locally brewed beer in your hand and enjoying the panoramic view of the city that presents itself to you here – on your own, as a couple or in groups – the 500-metre wide outdoor flight of steps has quickly become the residents' new favourite place to spend their free time.

It directs the gaze of its visitors to the Rhine. The scene is rounded off by a sturdy railing with a filigree design on the quay wall that is made of 1.5-metre high and three-metre long protective steel elements, which were installed to prevent people from accidentally falling into the river.

ZINKPOWER Meckenheim GmbH & Co. KG was assigned the task hot-dip-galvanizing this steel to protect it from rust and so it was awarded the contract to galvanize a total of 44 tonnes of railing for the Rheinboulevard from December 2014 to April 2015. The metalwork also included mobile crush barriers that the city of Cologne is able to deploy at special events. “Punctual deliveries and consistently high quality were what the customer wanted from us as its provider of galvanizing services,” said Rüdiger Thoß, the responsible Works Manager at ZINKPOWER Meckenheim.

The Duplex System anti-corrosion coating was applied to ensure that the railings remain in use for as long as possible. This specifically means that the steel elements were hot-dip galvanized and then given two coats of wet DB 704 paint. The main advantage of this system is the long-lasting mutual protection that the two components provide to each other. The coat of paint covers the layer of zinc, protects it from external effects and stops it from being scraped or scratched off. The base coat of zinc, on the other hand, will withstand even severe stresses and will assume the task of preventing corrosion should the paint become damaged.

An additional benefit: damage to the coat of paint may be immediately repaired locally, which means that the railings at the Rheinboulevard will be protecting the people of Cologne for a long time to come.

© C. Hardt/Future Image