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Hot
Dip Galvanizing is
a factory controlled metallurgical combination of zinc and
steel that provides corrosion resistance in a wide variety
of environments. Hot Dip Galvanizing protects steel from corrosion
in two ways. It provides cathodic protection and barrier protection.
For over 150 years Hot Dip Galvanizing has had a proven track
record of protection in a myriad of applications.
The
hot dip galvanized is manufactured using cold rolled
steel sheets which is coated with a thin layer of high grade
zinc on both sides by hot dip zinc coating process.We export
hot dip galvanized Steel Strip, Galvanized Steel Tape and Galvanized Steel Wire manufactured
using a continuous process line which ensures high adherence
and homogeneous coating thickness.
The
final product combines steel resistance and zinc durability,
making it fit for roll-forming and highly resistant to environmental
rusting. galvanized steel is delivered in strips, coils, tapes and wires . The hot dip
galvanized Steel Strip, Galvanized Steel Tape, Galvanized Steel Wire is used for armouring
of Telephone Cables, High Voltage Power Cables, Telecommunication Cables and for other general
applications.
The
basic elements to our galvanizing process are :
» Surface
Preparation »
Galvanizing
» Inspection/
Finishing
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Surface
Preperation |
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Surface
preparation is the most important step in the application
of any coating. In most instances, where a coating fails before
the end of its expected service life it is due to incorrect
or inadequate surface preparation. With galvanizing, the surface
preparation process contains its own built-in means of quality
assurance and quality control in that zinc will simply not
react with a steel surface that is not perfectly clean. Surface
preparation for galvanizing typically consists of three steps:
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Caustic Cleaning |
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The
caustic tank contains heated water with caustic soda and detergent
additives. Oils, soil and soluble paint markings are removed
from products during immersion here. Another tank containing
plain water is used to remove residues of the caustic dip.
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| 2.
Add Pickling |
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A
bath of heated dilute sulfuric acid solution removes rust
and mill scale from the products.Another tank containing plain
water is used to remove residues from pickling.
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| 3.
Fluxing |
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Zinc
ammonium chloride in solution, provides additional cleaning
of the products being dipped. During galvanizing, the film
of flux on the products improves wetting between the steel
and the molten zinc.
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Galvanizing |

In this step, the material is completely immersed in a bath
of a minimum of 98% pure molten zinc. The bath temperature is
maintained at about 850° Fahrenheit. Fabricated items are
immersed in the bath long enough to reach bath temperature.
The articles are slowly withdrawn from the galvanizing bath
, and the excess zinc is removed by draining, vibrating, and/or
centrifuging. The steel then goes into a dilute chromate quench
giving your product a longer lasting luster.
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Inspection/Finishing |
The
most important method of inspection for galvanized articles
is visual. A variety of simple physical and laboratory tests
may be performed for:
Thickness,
Adherence of the coating,
Uniformity of the coating,
Appearance
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