The table top looks like the most exposed part of an outdoor table. In practice, the first part to fail on a hospitality terrace is almost always the table base – specifically the bottom edge of the foot, where it stands in a puddle, where wash-down water rinses it every evening, and where road salt collects in winter.
Rust on a base is not only a cosmetic problem. Once the structure starts to break down, the table loses stability, the cast-iron cross works loose and the top begins to move. A base that cost less at the time of purchase therefore often means replacing the whole table after three or four seasons.
Hot-dip galvanizing changes that. Below we explain what hot-dip galvanizing actually is, why it works differently from paint, how long it lasts in different environments, and when your terrace really needs it – and when it is money you do not have to spend.
A table base sits in the worst possible position on a hospitality terrace. The pattern of stress is the same every day:
That last point is the key to understanding why paint alone is not enough. Powder coating is barrier protection – it works by physically separating moisture from the steel. As long as the layer is intact, it works very well. The moment a scratch or a knock breaks through to bare steel, however, corrosion starts underneath, then spreads sideways beneath the coating and lifts it. One scratch eventually means paint flaking over several centimetres.
In hot-dip galvanizing, a cleaned steel article is immersed in molten zinc at roughly 450 °C. The zinc does not merely coat the steel – it forms a metallurgical bond, a series of iron-zinc alloy layers grown into the base material.
The process and its requirements are governed by EN ISO 1461, which among other things specifies minimum coating thicknesses according to the thickness of the steel.
| Steel thickness | Mean coating thickness (min.) | Coating mass (min.) |
|---|---|---|
| over 6 mm | 85 µm | 610 g/m² |
| over 3 to 6 mm | 70 µm | 505 g/m² |
| 1.5 to 3 mm | 55 µm | 395 g/m² |
| under 1.5 mm | 45 µm | 325 g/m² |
Source: Galvanizers Association, EN ISO 1461. Values apply to non-centrifuged articles.
Hot-dip galvanizing protects steel in two ways simultaneously, and that is exactly why it is so effective:
This is the essential difference. On a painted base, a scratch is the beginning of failure; on a galvanized base, the system absorbs it.
The terms are often mixed up in practice. “Galvanized” can mean very different things, so it is worth knowing the difference.
| Hot-dip galvanizing | Electroplated (electro-galvanized) zinc | Powder coating only | |
|---|---|---|---|
| Process | immersion in molten zinc at ~450 °C | zinc deposited by electrolysis at room temperature | powder applied and cured in an oven |
| Thickness | 45–85 µm and above | typically 5–25 µm | 60–100 µm |
| Bond to steel | metallurgical (alloy layers) | mechanical / electrochemical | mechanical (adhesion) |
| Response to a scratch | cathodically protects the exposed steel | limited – the layer is thin | corrosion spreads under the paint |
| Coverage of hollow sections | inside tubes and in welds too | accessible surfaces only | external surfaces only |
| Suitable for | outdoor and coastal use | indoor, dry use | indoor and moderate outdoor use |
For a table base, the most underrated row is coverage of hollow sections. The column of a base is a hollow tube. Paint is applied to the outside only – the inside stays bare steel. In hot-dip galvanizing the molten zinc also runs into the inside of the tube and into the welds, which is precisely where condensation collects and where no maintenance ever reaches.
Hot-dip galvanizing and powder coating are not competitors. Combining the two is called a duplex system, and for hospitality furniture it is the best solution because it brings together two advantages:
The effect is multiplication rather than addition. According to the American Galvanizers Association, a duplex system lasts 1.5 to 2.3 times longer than the sum of the two protections applied separately. The industrial application of powder coatings to hot-dip galvanized steel is covered by EN 15773.
The galvanized bases in the AG VEBO range are built exactly this way: the steel is hot-dip galvanized, then powder coated in black (RAL 180A), with a cast-iron top cross. When the paint is damaged, what lies underneath is not bare steel but zinc.
“How many years does it last?” is the wrong question until we say where the table stands. The standard EN ISO 12944-2 sorts environments into corrosivity categories from C1 to CX and defines how much zinc is consumed per year in each.
| Category | Zinc loss | Typical environment | Life of a hot-dip galvanized coating |
|---|---|---|---|
| C1 | ≤ 0.1 µm/year | heated interiors: offices, hotels, shops | effectively unlimited |
| C2 | 0.1–0.7 µm/year | unheated spaces, rural areas with little pollution | over 100 years |
| C3 | 0.7–2.1 µm/year | urban and moderately industrial areas, coast with low salinity | over 100 years |
| C4 | 2.1–4.2 µm/year | industrial areas, swimming pools, coastal areas, marinas | 20–40 years |
| C5 | 4.2–8.4 µm/year | near-permanent condensation, heavy pollution, offshore | 10–20 years (duplex recommended) |
| CX | 8.4–25 µm/year | extreme humidity and aggressive atmosphere, tropical offshore | shorter; duplex essential |
Source: Nordic Galvanizers, Hot Dip Galvanizing and corrosion categories (PDF). The stated service lives apply to coatings to EN ISO 1461 on steel thicker than 6 mm. See also Institute of Corrosion, ISO 12944 – The Corrosive Environment.
A galvanized base costs more. It is only fair to also say when you do not need one.
The decision is simply arithmetic. If a galvanized base costs a few tens of euros more but saves one replacement in ten years – including labour, delivery and the table being out of service mid-season – it pays for itself the first time a replacement is avoided. We described the same logic in 5 Ideas for a Modern Café or Bar Terrace.
The word “galvanized” in a quotation is not yet information. Before buying, check:
In the garden table bases and tables category, the following models are available hot-dip galvanized and powder coated. All are 73 cm high, black powder coated (RAL 180A), with a Ø 45 cm cast-iron top cross and four levelling glides.
| Model | Foot | Column | For table tops up to | Weight |
|---|---|---|---|---|
| NERO MEDIUM ZINC | 43 × 43 cm | 8 × 8 cm | 80 × 80 cm / Ø 90 cm | 18 kg |
| NERO XL ZINC | 50 × 50 cm | 8 × 8 cm | 90 × 90 cm / Ø 100 cm | 18 kg |
| NIKO ZINC | 65 × 43 cm | 8 × 8 cm | 110 × 80 cm | 23.5 kg |
| DUPLO NERO ZINC | 70 × 40 cm | two columns 8 × 8 cm | 160 × 90 cm | 25 kg |
All models are also available in a non-galvanized version (NERO MEDIUM, NERO XL, NIKO, DUPLO NERO), suitable for interiors and covered terraces.
The base is only half the table – the other half is the table top. For outdoor use the same rule applies as for the base: the material must be chosen for the actual environment, not for the photograph. For bar height there are bar table bases, and for interiors indoor bases.
In hot-dip galvanizing the article is immersed in molten zinc at roughly 450 °C, producing a metallurgical bond and a coating 45–85 µm thick or more, in line with EN ISO 1461. In electroplating (electro-galvanizing), zinc is deposited by electrolysis at room temperature and the coating is typically only 5–25 µm thick. Hot-dip galvanizing is the appropriate process for outdoor hospitality use; electroplating is intended mainly for indoor, dry applications.
Yes. Zinc is electrochemically less noble than iron and acts as a sacrificial anode – at the exposed spot it corrodes instead of the steel and protects it cathodically. That is why a scratch on a galvanized base does not spread, whereas on a merely painted base corrosion travels under the paint and lifts it.
It depends on the environment under EN ISO 12944-2. In an urban environment (category C3) the coating life is over 100 years; in coastal and industrial environments (C4) it is 20–40 years; in the most aggressive environments (C5) it is 10–20 years. In practice this means corrosion is not the limiting factor in the life of a base, except directly by the sea.
A duplex system is the combination of hot-dip galvanizing and powder coating. The paint slows the consumption of zinc, and the zinc takes over protection once the paint gives way. Total service life is 1.5 to 2.3 times longer than the sum of the two protections separately. The industrial application of powder coatings to hot-dip galvanized steel is covered by EN 15773.
Bare hot-dip galvanized steel is grey, often with a visible crystalline spangle. AG VEBO galvanized bases are powder coated black (RAL 180A) after galvanizing, so the protection is invisible – the base looks identical to the standard version, but under the paint there is zinc instead of bare steel.
With neutral cleaning products and water. Strongly alkaline and strongly acidic agents dissolve zinc, so avoid them. White powder on bare zinc (wet storage stain) is a normal oxide phenomenon in the first months and does not indicate a fault.
Often not. A covered terrace whose furniture is stored dry over winter is close to category C2, where an ordinary powder coated base will also last a long time. Galvanizing pays off where salt is present (sea or winter road salt), where there is constant damp or chlorine, or where the terrace is hosed down daily.
AG VEBO specialises in chairs, tables and other professional furniture for the HoReCa & Events sector. If you are not sure whether your location calls for the galvanized version, tell us where the terrace is and how it is used – we will advise based on the actual environment, not on the catalogue.
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Author: Jan Češnjevar, AG VEBO d.o.o.
