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

[David Ingebretsen]

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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