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FAQ

  • Why do holes have to be made into the components and how large do they have to be?

    Why do holes have to be made into the components and how large do they have to be?

    When hot dip galvanizing various components, they are completely dipped into the approx. 450° hot liquid zinc. These holes allow the dipping and immersion of the components into the molten zinc. They also guarantee that the molten zinc reaches all corners and niches of the components and that after the dipping, that the molten zinc also flows off rapidly and completely. Hollow structures can only be hot dip galvanized with holes in them, due to the possible danger of explosion. The hole diameters vary between 10 and 16 mm. Size and number of holes depend largely on the size of the component. Further information can be found in the leaflet „Feuerverzinkungsgerecht Konstruieren und Fertigen“ or from our representative in your area.

  • How does hot dip galvanizing actually work? Can the bath be too old, cold or dirty?

    How does hot dip galvanizing actually work? Can the bath be too old, cold or dirty?

    The actual hot dip galvanizing is preceded by a pre-treatment of the material that needs to be galvanized. This is used for cleaning off rust, scale, welding slag, oils and fats, etc. The component is dipped into the molten zinc after pre-treatment and drying. Zinc has a melting temperature of about 419 ° C and the operating temperature of the bath is around 440-460 ° C. When galvanizing, a metallurgical bond of the liquid zinc with the steel surface is formed. The result is a coating of the steel part, which consists of various composite iron-zinc-alloys with a layer of pure zinc above it. The requirements for hot dip galvanizing are set in the standard DIN EN ISO 1461. The quality of the baths are constantly monitored and adjusted to meet the requirements of this standard, in all of the Seppeler galvanizing plants. For further questions, please contact our representative in your area.

  • Why are there different optical zinc surfaces (light – dark, smooth – rough)

    Why are there different optical zinc surfaces (light – dark, smooth – rough)

    A pure zinc layer, that looks shiny and silvery with a partially distinct flower pattern of zinc, is bonded to the surface of the steel part when it is removed out of the bath. Depending on the chemical composition of the steel, the speed of the formation of iron-zinc alloy layer vary. Silicon and phosphorus, for example, speed up the iron-zinc reaction, so that thicker zinc coatings are produced. This usually causes a matt or gray appearance with a rough surface. If special requirements are required regarding the appearance and the thickness of the zinc coating, then the selection of appropriate steel material should be coordinated with the hot dip galvanizing company. Our representative in your area will be happy to give you advice regarding your individual requirements.

  • Why does hot dip galvanizing sometimes cause a thermal distortion?

    Why does hot dip galvanizing sometimes cause a thermal distortion?

    Distortion can sometimes occur during hot dip galvanizing, due to the fact that the steel components, when dipped, are also heated to the temperature of the 450 °C hot molten zinc. During the heating of the steel, tension can occur in its rolled, edged and welded areas, which could lead to distortions. Distortion of steel components can be prevented by using constructive measures. Our representative in your area will be happy to give you advice on this theme.

  • How large can my component be, so that it can still be galvanized?

    How large can my component be, so that it can still be galvanized?

    The largest possible size of the component to be galvanized depends on the working dimensions of the zinc bath. In addition, the transport of the steel components have also to be taken into consideration. The Seppeler galvanizing plants are able to galvanize anything ranging from 6 mm screws to steel constructions with a dimension of 23 m long and/or 4.80 m high. The zinc bath working dimensions of the individual Seppeler galvanizing plants can be found here.

  • How long does the galvanizing take and how long is the delivery time?

    How long does the galvanizing take and how long is the delivery time?

    Even though the actual galvanization process, such as dipping the steel component into the molten zinc, only takes a few minutes, the complete process cycle for hot dip galvanizing lasts about 6 hours. After all, your component is optimally prepared for the hot dip galvanizing by an elaborate pre-treatment and drying process. The still very hot steel component needs to cool down after the hot dip galvanizing process before it can be finally checked. Any possible remaining zinc noses or impurities caused by zinc ash or fluxes are also now removed. Delivery time is usually 1-2 working days: a shorter delivery time can be arranged on request.

  • Can I visit your hot dip galvanizing plant?

    Can I visit your hot dip galvanizing plant?

    We would be happy to perform a company tour for clients by prior arrangement. For further questions, please contact our representative in your area.

     

     

  • Is it possible to galvanize only part of the components, for example only on the outside?

    Is it possible to galvanize only part of the components, for example only on the outside?

    In general, the complete component is coated with the corrosion protective layer of zinc. This creates a particularly sustainable and 100% corrosion protection. However, exceptions are possible in individual cases: Please, allow our representative in your area to advise you in this area.

  • Which standards apply when galvanizing?

    Which standards apply when galvanizing?

    Hot dip galvanizing in accordance with DIN EN ISO 1461 “Hot dip galvanized coatings on steel deposited zinc coatings (hot dip galvanizing)” is a matter of course for all of the Seppeler Group galvanizing plants. Application of the DASt-Guideline 022 for “Hot-dip zinc coating of prefabricated load-bearing steel components” apply to all structural components according to the German Construction Regulation, List A. All of the Seppeler Groups fulfil these requirements and have been awarded the Certificate of Compliance (UZ) from the Institut für Oberflächentechnik GmbH (Institute for Surface Technology). Centrifugal galvanization is carried out according to Standard DIN EN ISO 267, part 10 ” Fasteners, technical specifications, hot dip galvanized parts.” More information can be found here.

  • Is it possible to coat the hot dip galvanized surfaces immediately?

    Is it possible to coat the hot dip galvanized surfaces immediately?

    Even freshly galvanized surfaces can be wet or powder coated with the appropriate colour systems. Our representative in your area would be pleased to advise you in this matter.

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