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In order to assure a long life, all POORTLAND fencing and gates undergo
a rustproofing treatment. For this, we use two techniques:
hot dip galvanizing and metallization.
· Hot dip galvanizing:
The application at industrial scale of hot dip galvanizing is now
200 years old. Yet it remains a very effective way to protect steel
from rust. The process consists of immersing the steel in a 450 °C
dip of melted zinc.
In order to remove greases and oils from the steel, it is first
immersed in a degreasing bath. After a rinse, all surface oxides, such
as rust and calamine are removed in a pickling bath consisting of
diluted hydrochloric acid. Rinsed once again and the perfectly cleaned
steel is ready to be "fluxed". The flux bath consists of
ammonia zinc chloride, a small layer of which protects the steel surface
against oxidation while waiting for it to come into contact with the hot
zinc. A small flux layer is melted into this, which gives excellent
metallic contact and assures a good irrigation of the steel through
the zinc. With the immersion into the zinc dip, the steel gradually takes
on the temperature of the zinc. Diffusion occurs that gives rise to the
forming of zinc-iron alloys. During this process, a layer of pure zinc
is deposited on top of the alloy layers.
Not all gates and fencing are treatable by hot dip galvanising. The
processing of perforated or full steel plates entails that if they are
hot dip galvanised, on the one hand, the perforations would be full of
zinc and on the other hand (in the case of larger surface areas) the
plates would be warped by the high temperature. These types of gate and
fencing have to be metallized.
Partner in galvanising: GALVA NOORD division of Galva Power Group NV
· Metallisation
The fire galvanising or metallisation consists of covering the steel by
a variable zinc- aluminium protection layer. The metallisation process
with zinc or a zinc-aluminium alloy consists in melting the zinc material,
under the form of a wire with the aid of a flame-gun and compressed air and
spraying on the surface area to be treated. The metallisation process is
always preceded by the irradiation of the steel surface in order to remove
every trace of rust or dirt in order to attain the degree of purity of the
metal surface area equivalent to the SA2.5-Sa3 norm on the one hand, and on
the other, to arrive at a degree of roughness that is necessary for the
doing of the metallization.
Partner in metallisation: PLASTIMETAL
GUARANTEE
All steel gates en fences come with a 10 year guarantee against rust formation.
(view terms and conditions)