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Application in India
     
 
 
Galvanising provides a tough, metallurgically bonded zinc coating which completely encloses the steel and seals it from the corrosive action of the atmosphere providing barrier protection. In addition to this, it provides sacrificial protection wherein zinc corrodes preferentially, forming a protective cover over areas, which are exposed accidentally.

The galvanising is carried out in a temperature range of 420 to 450 degrees centigrade, which does not affect the properties of steel in any manner. At the same time the bond strength of the concrete with reinforcement bar remains the same and in some cases more than that with black rebars.

The lead-time required for galvanising is 1-2 days from the day material is given for galvanising. There exists a strong network of galvanisers spread across the country, which enables galvanising to be nearest to the project site. Also, there has been an increasing trend of rebar manufacturers setting up an in house galvanising facility for easy and ready availability and fast availability of galvanised rebars.

Thus, galvanisation provides solutions to the pressing needs of the construction sector, preserves scarce national resources, and ensures problem free life of structures. Based on these benefits and after detailed consultations with leading structural consultants, engineers, research foundations, and international bodies, galvanising of reinforcements has been proved as the best protection that can be provided to steel.

The benefits of galvanised reinforcement include:
  
 
· Protection to the steel during storage and construction prior to placing the concrete.
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Diminished effect of variations in concrete quality.
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Safeguards against poor workmanship, especially misplacement of reinforcement,
poor compaction and inadequate curing.
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Delayed initiation of corrosion and the onset of cracking.
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Reduced likelihood of surface staining.
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Increased structural life of concrete, particularly where chloride contamination is likely.
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Chloride ion concentration required to start corrosion of zinc on galvanised release is 3 times the threshold concentration for plain rebars.
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Zinc corrosion products do not damage concrete but block pores in concrete, reducing the chloride ion diffusion.
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Zinc provides cathodic protection even to areas that become uncovered due to zinc corrosion.
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Zinc does not allow contact between chloride ions and steel.
 
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