- Visually, it seems damaged, uneven
and it worsens over time.
- Parts require special contactless
packaging.
- They cannot be stored outside during the first days after manufacture.
- It is not resistant to some acids and
chemicals.
Behavior of galvanized steel
in humid environments
The behavior of zinc varies depending on
the environment where it is found. In hu-
mid environments, it generates zinc salts
which are highly hygroscopic and moisture
absorbent. It is a snowball or loop effect:
- The pieces require special contactless
packaging, especially if stored outdoors, to
prevent moisture from being retained, as it
would reduce its strength.
- It is not resistant to some acids and
chemicals.
Hot galvanized
Hot galvanization consists of introducing the
piece, once made, in a receptacle of 842 °F.
molten zinc. A zinc layer is created with a thickness varying between 60 and 90 µm.
This process ensures maximum protection of profiles and a very long, maintenance free product life. In general, their
use is widespread in urban fittings and
structures found outside (electric poles,
signs, barriers). Being an immersion process, the entire piece is coated and its mechanical strength (against blows, impacts,
abrasions, loading and unloading, etc.)
is higher.
However, it presents more than a few
disadvantages:
- It is a very complex and expensive process, needing large capacity facilities specifically prepared for this.
Example of profile deterioration and edge oxidation
Hot-rolled galvanized uprights
Hot-rolled galvanized
material performs best
in environments
with a constant exchange
of wetting and
drying cycles
