Engineering

Exemplary components

Tension rod systems	Node systems	Wood screws
Tension rod systems are used in applications such as framework elements and wind bracing of roofs and walls, for adjusting the tensioning of timber and steel beams, glass façades or pedestrian walkways. As safety-relevant components, they require effective corrosion protection.	Steel node systems are used for example on delicate roof and facade constructions as well as glass and membrane constructions. Amongst other things, they serve to ensure secure load transfer.	Wood screws are characterised by the fact that they cut their own thread when fastened to the timber. As they are often screwed to components made from other materials, there is a risk of contact corrosion. Used for roof structures, carports or playground equipment, they need to be well protected against corrosion, not least for safety reasons.

Requirements

Up to CX as per DIN EN ISO 12944
Corrosion protection 1,440 h (in SST as per DIN EN ISO 9227)
Sliding properties
Tapping torque
Chemical resistance

Solutions

When it comes to long-term corrosion protection of components and fastening elements in metal structures, the zinc flake systems from DÖRKEN offer a high-performance alternative. The coating consists of a zinc flake base coat and an organic or inorganic topcoat. It is applied in very thin coats at low cross-linking temperatures (up to max. 240 °C). At the same time, no hydrogen is involved in the application process, so there is no risk of application-related hydrogen-induced stress corrosion cracking.

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Road

From traffic signs and anchorings to noise protection walls and retaining systems for slopes (geotechnical engineering): steel safety-relevant equipment is used everywhere on roads and motorways. As these components require long-term protection against weathering, DIN EN ISO 12944-2 stipulates high-quality coating with the highest corrosion protection class.

Bridges

Today, steel and reinforced concrete bridges have to withstand extreme loads: they are exposed to constantly changing weather conditions and bear enormous loads. In order to reach the targeted duration of use of 40 years and satisfy the corrosion protection requirements defined in DIN EN ISO 12944 the steel components utilised must be provided with effective protection.