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Re: Corrosion Protection

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Vijay
Duplex systems would be the one of the best choice for the steel corrosion
protection. This method combine the benefit of epoxy painting and
galvanization. Be sure to ask the epoxy coating supplier for the primer for
epoxy coating on the galvanized steel surface. Special primer would be
required for this kind of application. You can download the Duplex system
information from the following web page:
http://www.galvanizeit.org/publications/pdf_files/PT-DS-98.pdf

Jeng-Wei Li

----- Original Message -----
From: "Vijay K. Patil" <vjkpatil(--nospam--at)vsnl.com>
To: "SEAINT" <seaint(--nospam--at)seaint.org>
Sent: Sunday, July 28, 2002 2:54 AM
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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