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Forum index » Science and Technology » Chem » Coatings
Corrosion systems Question
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Nicolas DELFAU
science forum beginner


Joined: 27 Jun 2005
Posts: 15

PostPosted: Tue Sep 27, 2005 5:52 am    Post subject: Re: Corrosion systems Question Reply with quote

Generally speaking, in anticorrosive systems, we use 2 things :
- the sacrifice of components such as zinc,
- the barrier properties of crosslinked thermosets.

In practice, zinc is incorporated either as a powder of pure zinc or as zinc
phosphate or zinc oxide, just to mention few.
Sometimes, when harsh conditions are met, "zinc rich primers" are used,
where zinc content is above 92% w/w on dry matter.
Otherwise, smaller amounts are prefered and we add additives such as zinc
phosphates.
The media is, in the vast majority of cases, a two-component epoxy.
Once resin and hardener have crosslinked into a tough thermoset, the
shielding is good, which prevents moisture and air to go through the coating
onto the substrate. That's why zinc components are never completely ruined.
Depending on the corrosiveness of the atmosphere, we adjust the thickness of
the system, and we advise our customers to a 2- or 3-coat system, with
generally :
- an epoxy primer or ground coat,
- a thickness coat (often an epoxy, as well),
- a finish (often a polyurethane, because epoxies behave very bad outdoors,
with a lot of chalking for example)
In France, we have an association called ACQPA for the certification of the
coating systems, applicators, and controllers.
If you need further explanations, don't hesitate to contact me :
Nicolas DELFAU
R&D Manager
Peintures SOB
FRANCE
delfau.nicolas@peintures-sob.fr

Hope this will help.

"Highway Man" <bikes@ride.com> a écrit dans le message de news:
11jg9s51utuo923@corp.supernews.com...
Quote:
Perhaps someone can assist me. What are the 'active' components in an ion
generating anti-corrosion system? Obviously there is a reference cell, but
what are the other components?
Thank you very much for your help.
Rick
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Highway Man
science forum beginner


Joined: 26 Sep 2005
Posts: 1

PostPosted: Mon Sep 26, 2005 2:56 pm    Post subject: Corrosion systems Question Reply with quote

Perhaps someone can assist me. What are the 'active' components in an ion
generating anti-corrosion system? Obviously there is a reference cell, but
what are the other components?
Thank you very much for your help with this.
Rick
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