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Phosphoric acid is used extensively for rust conversion, in particular in
the marine industry. It is sold under the trade name Ospho.
Andina Foster
> Some grades of stainless steel still show rust stains after being exposed
to
> salt water moist air.
>
> There is a product for household cleaning that removes calcium, lime, and
rust
> deposits from toilet bowls and bath tubs.
> The active ingredient is phosphoric acid and glycolic acid.
> I have had a lot of success in cleaning up this surface rusting and
resultant
> streaks on adjacent hull structures.
>
> Not only can this remove the rust stains from SS metal fittings but the
> phosphoric acid converts the iron oxide on plain black steel into a
coating
> that slows down further rusting.
> This is a standard rust proofing process used in industry to prep mild
steel
> panels before priming and painting.
> I am not aware of phosphoric acid being used for this purpose to any
great
> extent in the marine industry.
>
> Would any of the list members have any information to add or to the
contrary.
>
> Regards
> Arild
>
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