APPLICATIONS
- Transmission line towers
- Lighting poles and towers
- Guardrails
- Stair handrails
- Steel structures
- Bolts, nuts, nails
- Rool beams
- Pipes
- Steel structures for railways
- Fittings
- Boilers, water tanks
- Hardware for transmission lines
- Formworks
- Scaffolders
- Bridge safety rails
- Cooling and refrigerating systems
- Automotive industry
- Traffic warning plates
- Advertisement boards and poles
- Antenna towers
PROTECTING STEEL AGAINST CORROSION
Steel is a very convenient material being used in various industries. Because of its tendency to rust easily it requiresto be coated with an anticorrosive material. One of the methods to prevent of rusting steel is zinc coating currently named as Galvanizing.
Because of the long term corrosion proof effect of galvanization, no further supplementary anticorrosive means are then needed except in very special cases. This proves to be o most economic method of the long duration anti-corrosive protection of steel. Service life of hot dip galvanizing for various conditions is shown the below table.
Heavy Industry 15 years |
Industry 24 years |
Urban Area 30 years |
Moderate Sea 34 – 36 years |
Tropical Sea 38 – 40 years |
Rural Area 48 – 50 years |
Galvanized coating is closely adhesive because of alloy reaction of ferrous base metal and zinc. Therefore, galvanized coating can not be removed or peeled off by shock or friction.
In case the surface film of zinc coating is damaged for any reason, corrosion on steel will be kept under control, due to the action of the surrounding zinc, which becomes positive ionizing, and thus, functions in a self-sacrificial manner acts as an anticorrosive in order to protect steel by the effect of electro-chemical action. In case paint coating is used, there is no such effect of paint and on the order hand, in case nickel coating is damaged, steel will rust more rapidly than the uncoated steel, because of more electro-positive character of nickel. |
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