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RE: Corrosion Protection

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Each method has advantages and disadvantages.  A lot depends on the source
of potential corrosion.  Hot dip galvanizing offers a lot of advantages
including a hard surface, and cathodic protection for holidays.  My
preference is the duplex system which is little more than a galvanized
surface that is painted with an epoxy, and topped with a polyurethane.  The
polyurethane keeps the epoxy from oxidizing.

There are some coating compounds that have very good abrasion resistance.

You may want to look at the US Army Corps of Engineers Paint Technology
Center, Commercial Products Catalog.

Harold O. Sprague

> -----Original Message-----
> From:	Vijay K. Patil [SMTP:vjkpatil(--nospam--at)]
> Sent:	Saturday, July 27, 2002 1:55 PM
> Subject:	Corrosion Protection
> Dear Friends
> What kind of corrosion protection for structural steel works is good and
> economical
>     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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