The life of products up to 50 years
Low cost of operation
Galvanizing makes an impervious barrier between environment and metal.
Use: In conditions of corrosion activity of environment for procuring warranty period of metalwares and reducing metal loss by corrosion in industry.
The most common covering from the group of metal covering
Physico-chemical properties of zinc provide the entire complex properties of the protective coating.
Process of galvanizing is:
Input control of metalwork state
Surface preparation of steel structures for galvanizing
Further development of the zinc coating
Assessment of quality of the coating on the Regulatory Compliance
Execution of documents about quality
The corrosion resistance of zinc coatings depends on:
the thickness of the coating;
the climatic characteristics of the atmosphere;
the type of the atmosphere;
the characteristics of the degree of aggressiveness of the atmosphere.
It is not uncommon that if properly calculated and appropriate care, galvanized products can serve up to 50 years.
The life of the metal is determined in the design documentation by the developer of this product and depends on a number of technical factors, such as:
-conditions of use
- modes of periodic maintenance
Corrosion protection in the assessment plays an important role and takes into account when setting the parameters on durability.
It isn’t uncommon that if properly calculated and appropriate care, galvanized products can serve up to 50 years.
Depends on the operating conditions, the corrosion rate in mm / year:
rural atmosphere, 1-2.2;
Protection by hot zinc is produced
for products made from low carbon steel,
ordinary quality and structural steels,
including high strength steel.
Range of applications for hot-dip galvamized
products: energy — construction –
urban infrastructure – agriculture –
transport and road construction –
industrial construction — the oil industry;
It is possible to apply paint and polymeric coatings – combined coatings
For the operating conditions of metal in various industries it is expedient to galvanize surface.
Average life of galvanized products to recovery (repair with zinc-containing composition) of the protective layer 5 times higher than lifetime of coloured products (before the repair phase of the painted surface)
Steel grade, pledge to metal;
Dimensions of metal;
The design of metal, provides workability when immersed into the melt;
The design of metal, providing exception of air pockets and closed cavities;
Thickness in the prefabricated parts should not have a significant run-up to the thickness of the base and have the same chemical composition;
In the process of galvanizing different tones of the coating are possible. The reason is an increased content of steel carbon, phosphorus and silicon.
Slow cooling of parts after galvanizing. Much heat capacity of large products causes an increase in iron-zinc alloy, which penetrates on the surface of pure zinc, forming dim gray spots.
Increasing exposure in the melt increases the thickness of the intermetallic phases.
Diferrent tones aren’t the sign of rejection!
Not allowed. It is features of design organizations.
Technological holes are necessary for entrance of solutions and molten zinc inside the product (to exit gases from them when immersed in a solution or melt) and run-off of solutions and molten zinc when removing items from the pretreatment baths and galvanizing bath.
«White rust» is a three-dimensional layers of oxide and zinc hydroxide on the coating. May contain brown iron hydroxides.
Recent galvanized product storage in a humid atmosphere until the formation of a layer of zinc carbonate should be excluded.
Effects of atmospheric moisture with the presence of acid and salt of sodium chloride type should be excluded.
Storing items should include ventilated conditions and low humidity of air atmosphere