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Corrosion Protection

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Dear Friends

What kind of corrosion protection for structural steel works is good and
    1. Galvanization
     2. Epoxy coating
     3. Polysulphide based chemicals

All the manufacturers claim that their method is the best claiming
drawbacks of the other
1. One cannot weld on galvanized surface as the zinc coating goes off
and in fact accelerates the corrosion process. Whereas the galvanizers
claim that there are sprays available with 94% zinc which when sprayed
on the welded surface would once again make it good against corrosion.

2. Epoxy is supposed to be non UV resistant and ofcourse bonding with
steel is not good esp. when the section is bent after application of
epoxy it cracks and after a few days starts peeling off.

3. Polysulphide(the magic potion)  based  chemical manufacturer claims
that it can be simply brush applied. However it has a soft surface which
can get scratched off. However the remedy is supposed to be simply apply
it again on it.

All manufacturers have tall claims and certificates proving their
product is good as compared to other.

What in your opinion is the best for protection against corrosion.

Vijay Patil

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