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Hot-dip galvanising

Hot-dip galvanising

Hot-dip galvanising



Hot-dip galvanising

The highest corrosion protection for your steel. Hot-dip galvanising guarantees perfect all-round protection of your components.

In hot-dip galvanising, the pretreated steel parts are immersed in a molten zinc liquid that is heated up to approx. 450 °C. This results in a metallurgical reaction, which makes steel and zinc inseparable at their interface and provides a pure zinc coating on the surface. The dipping process allows components to be coated on the inside, outside and even in inaccessible places. The result is an impact resistant, highly corrosion resistant and durable surface with long-term protection that requires no maintenance. These properties are indispensable wherever the most difficult general conditions and weather conditions prevail: The locksmith’s trade, steel and plant construction, vehicle manufacturing and agriculture. The thickness of the zinc coating depends on the material and process. 

At our Bludesch, Bürmoos and Judenburg locations, we galvanise in compliance with DIN EN ISO 1461, DASt Guideline 022, DIN EN 1090 and based on customer-specific requirements.

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Advantages at a glance


Technical data

Hot-dip galvanising
Processes General-purpose galvanising by immersion in a melted solution of liquid zinc at approx. 450 °C
Coating colour from bright glossy to dark grey, depending on the silicon (Si) and phosphorus (P) content in the base material
Base material all common construction steel and cast iron types
Corrosion protection Long-term corrosion protection of > 50 years under normal load, passivation with Zincomet Plus
Hardness 120 HV
Temperature resistance up to approx. 195 °C
System technology Trusses, hangers, custom rack construction
Conformity DIN EN ISO 1461, DASt - Guideline 022, DIN EN 1090, lead-free variants - RoHS, REACH, 2000/53/EG (End of life vehicles)
Execution Minimum layer thickness of zinc coatings according to EN ISO 1461: > 45 to> 85 μm depending on material thickness. Passivation with Zincomet Plus - glossy preserved surface for the prevention of white rust and water marks
From our R&D all Collini hot-dip galvanising sites are already Pb-free
Protective properties Corrosion protection of inside and outside surfaces, angles and cavities, including all edges
Functional properties electrical (up to 50 V/μm) and heat insulating, adhesive, impregnable, dimensionally stable, primer for duplex coating
Decorative properties Zinc flower, metallic silvery glossy appearance
Special properties High mechanical load capacity, non-porous, extremely long maintenance-free use, subsequent duplex coating is possible


Typical components & applications

Hot-dip galvanising has experienced very dynamic development in recent years, but its development potential is far from exhausted. The spectrum of innovations ranges from the introduction of environmentally friendly technologies, through adaptation to high-tech steels and complex components, to the development of new fields of application.


Typical components

Steel structures, façade parts, fences, gates, doors, terraces, balconies, carports, railings, lorry trailers, semi-trailers, transport racks, swap bodies, plant components, power plants, onshore and offshore installations, animal stable equipment, masts, supports, cable car seats and cable car components.

Industrial applications

Steel construction, home and garden architecture, bridge construction, mechanical engineering, agricultural engineering, vehicle manufacturing, plant engineering, cable car manufacturing  

The locksmith's trade represents a traditional application of hot-dip galvanising for individually designed iron and steel structures, such as doors, gates, door frames, railings, fences, balconies and carports that are exposed to the weather.

Hot-dip galvanised structures such as scaffolding, form work, bridges, halls, multi-storey car parks, etc., offer maximum design options and represent an economical solution in the construction industry and its subcontracting areas. Hot-dip galvanising in steel construction makes an important contribution to increasing service life and sustainability.

The vehicle manufacturing and agricultural sectors offer their customers designs, equipment, machinery and vehicles for tough conditions. Dirt, deposits, stone chips, snow, rain, de-icing salts and animal excrement place high demands on corrosion protection in everyday life. It must be resistant, durable, abrasion resistant and offer the best cost-performance ratio. Hot-dip galvanised steel has proven to be excellent for use in these areas.

In plant construction, all exposed components receive perfect all-round protection with hot-dip galvanising, even in hard-to-reach places, as well as long-term protection without maintenance for many decades. There is a wide variety in terms of areas of application, which range from mechanical engineering and plant construction to cable way construction.

Collini surfaces

Hot-dip galvanising of piece goods in the dipping process

The inseparable bond between zinc and steel is unique in the hot-dip galvanising process. The steel is not simply coated with zinc (as with painting or coating). It actually undergoes a metallurgical reaction, which is the alloy formation. A pure zinc layer (Zn Eta) Zn 100% Fe 0% settles on the surface, over the alloy layers (Fe-Zn Gamma) Zn 75% Fe 15%, (Fe-Zn Delta) Zn 90% Fe 10%, (Fe-Zn Zeta) Zn 94% Fe 6% and when moving out of the molten zinc. As a result, the corrosion protection of hot-dip galvanised parts is extremely high, and the layer is extremely generally resistant and abrasion resistant.

Click below on one of our hot-dip galvanising locations to see your contact partners:




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Contact us

    Martin Netzer

    Chief Technology Officer

    +43 (0)5576 7144 - 0 send email