Hot-dip galvanizing close to You

Hot-dip galvanizing is a durable, environmentally friendly and cost-effective way of protecting steel against environmental corrosion.

Our hot-dip galvanizing units are located in Aura, Pirkkala, Lievestuore and Mikkeli.

Hot-dip galvanizing helps protect steel

In addition to providing excellent protection against corrosion, hot-dip galvanizing will also help mend any installation or use-related damages. For this reason, it is a popular surface treatment method that is widely used by the construction industry, in railway, road and power line construction, as well as in vehicle and engineering workshop structures and, for example, in yard furniture.

Hot-dip galvanizing provides an excellent level of maintenance-free corrosion protection that will last for decades.

20-year coating guarantee

Our hot-dip galvanizing process is fully compliant with the international EN ISO 1461 standard, which guarantees its functionality for your needs. Our operations are also certified for their quality and environmental management. We are happy to consult about the visual appearance and thickness of any surface.

For climate stress categories C1–C3, we are able to provide a 20-year warranty on our coating. For more information and detailed warranty terms, please contact us. The warranty period must be agreed prior to coating. Our quality system is certified according to the ISO 9001:2015 standard and our environmental system according to the ISO 14001:2015 standard.

The hot-dip galvanizing process

The steel is first cleaned by pickling it in dilute hydrochloric acid. The pickling process helps remove corrosion and mill scale. After the objects have been rinsed with water, they are then immersed in a flux solution where a protective salt layer is applied to their surface, preventing the steel from becoming oxidized before the actual zinc bath. If necessary, we can also subject any hot-dip galvanized items to a passivation process.

After the structure has been cleaned, it is immersed in molten (450°C) zinc. The zinc and clean steel react with each other and form a coating (3-layer phase bond + clean zinc). Depending on the silicon content of the steel, the thickness of the material that is to be galvanized, and the immersion duration, the resulting layer thicknesses can vary from approximately 40 to 200 micrometres.

Our hot-dip galvanization services are available at the following sites:


Maximum size of object that is to be galvanized:
Single-dip treatment
3,0 x 1,45 x 2,0 m

Barrel galvanizing


Maximum size of object that is to be galvanized:
Single-dip treatment
9 x 1,45 x 2,4 m

Double-dipping process
Beams 12 x 0,2 x 0,2 m
Platforms 9 x 1,45 x 3,5 m


Maximum size of object that is to be galvanized:
Single-dip treatment
6 x 1,35 x 2,8 m

Double-dipping process
Beams 12 x 0,2 x 0,2 m
Platforms 6,2 x 1,45 x 4 m


Maximum size of object that is to be galvanized:
Single-dip treatment
12,5 x 1,3 x 2,2 m

Double-dipping process
Beams 19 x 0,5 x 0,5 m
Platforms 12,5 x 1,3 x 4 m

  • Instructions for surface treatment product batches

    To enhance the quality of our customer service and supply chain, we ask our customers to include a shipment note with the following information in every product batch:

    - The customer’s complete contact information
    - Desired surface treatment, such as hot-dip galvanizing or zinc electroplating, etc.
    - In conjunction with zinc electroplating, the desired passivation method, e.g. yellow passivation.

    - Dispatch list specifying the contents of the batch to be galvanized along with their package information, e.g.
    4 pcs PP100*100*4 L=3500-4000 / 1 bundle
    6 pcs HEA 200 L=2500 / 1 bundle
    2 pcs FRAME PP80*80*3 1500*4000 / 1 bundle
    154 pcs WASHERS 50*50*2.5 / 1 pallet

    - The “work number” of the batch that is to be brought, e.g. site name
    - Information on possible finishing treatments (painting, etc.)
    - Information on any pre-agreed additional work, e.g. thread opening, surface protection or special packaging.
    - The necessary drawings and instructions on surface protection and special packaging must also be provided

    - In the batches to be delivered to the Turku plant, specifications on any additional work preceding the surface treatment, such as polishing, glass blasting or vibration

    - Information on possible further deliveries (delivery address, cargo carrier, payer, possible contract numbers, etc.)

    - The possible tender number associated with the product batch

    If the customer orders the batch from a wholesaler or subcontractor, the identification information specified above must be provided with the batch as in direct customer deliveries.

    You can use the following shipment note when you are bringing your products in for hot-dip galvanization:
    Download the hot-dip galvanizing note here (Word File, in Finnish)

Aurajoki Oy

was founded in 1967 and specialises in metal surface treatment services and solutions. We produce, develop and design cost-efficient industrial service solutions – from the production process to the planning, finalisation and customer delivery process.

As a flexible service provider, we adapt to our clients’ every need: we can provide you with entire supply chains or even just individual services.

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