[sdiy] products for rust removal - the joys of phosphoric acid

[thx1138]

On 12/22/11 7:46 PM, "David Ingebretsen" <dingebre at 3dphysics.net> wrote:

> Try "Rust-Mort" available at auto body supply and paint shops.
> 
> David
> 
> 
>>> -----Original Message-----
>>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>>> bounces at dropmix.xs4all.nl] On Behalf Of aankrom
>>> Sent: Thursday, December 22, 2011 3:40 PM
>>> To: synth-diy at dropmix.xs4all.nl
>>> Subject: [sdiy] products for rust removal - the joys of phosphoric acid
>>> 
>>> I used to able to find this cheap-ass toilet bowl cleaner that used
>>> phosphoric acid. While being a lousy toilet bowl cleaner, it was a great
> rust
>>> remover. Plus I noticed that when I soaked a rust bespeckled galvanized
>>> chassis, the phosphoric acid would react with the zinc, giving the WHOLE
>>> chassis this nice battleship-grey finish. You couldn't even tell the rust
> had
>>> been there unless it was really pitted. But I can't find it anymore. I
> suppose
>>> it's a combination of the the toilet bowl cleaner being lousy at its job
> and
>>> the fact that phosphoric acid can contribute to algal blooms and such. So
> I
>>> rediscovered Naval Jelly and the hassles that come with it. It works fine
> on
>>> bare metal rusty surfaces. But it eats paint and sometimes leaves this
>>> residue that's as much of a pain to get off as the rust. I should try
> pouring a
>>> glob into a tub of water and try my galvanized chassis soak. Maybe
> diluting
>>> it is the answer.
>>> The effect phosphoric acid has on galvanized steel is similar to a
> technique
>>> to treat metals on motorcycles and such called "Gibsonizing"
>>> but try to Google THAT and get hits pertaining rust-removal. Seriously -
>>> even you try gibsonizing+rust+zinc, etc.
>>> 
>>> I was wondering if anyone else had some tips for products that remove
>>> rust. Ones that are stronger than citric acid. Something like Naval Jelly
> is a
>>> plus.
>>> 
>>> Anthony
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> 
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Hi Guys,

Look up Naval Jelly. I used it on my old Bicycle from the 50's that I had
bought in a swap meet.

Regards,

Terry