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letter 19603
Zinc sulphate treatment of cast ductile
iron
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I am seeking a method to protect cast Ductile Iron parts for use
in high temperature, high humidity enviroment, close to the ocean.
316 Stainless is usually specified but I have been told that a
treatment with zinc sulphate may be superior to even 316. How could
this be so?????? The items are cast into the outside of concrete
walls.
Ernest Comerford
- Brisbane, Queensland, Australia
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This sounded intriguing, but in searching the Internet and
reference books back to the early 1960's, I was unable to find such a
treatment. Perhaps someone was thinking of a zinc chromate-containing
primer?
If the parts are already installed, and assuming high temperature
refers to ambient conditions, I recommend a good cleaning (using a
phosphoric acid rust remover if necessary), followed by a zinc-rich
epoxy primer and a polyurethane topcoat.
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Ken Vlach
- Goleta, California
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