On Sat, 23 Feb 2013 02:47:15 +0000 (UTC), gregz
wrote:

Frank wrote:
On 2/22/2013 6:47 PM, Oren wrote:
On Fri, 22 Feb 2013 23:05:54 +0000 (UTC), "Danny D."
wrote:

On Fri, 22 Feb 2013 12:57:28 -0800, Oren wrote:

Naval Jelly

I wonder how it works.

I looked up naval jelly and it appears to be phosphoric acid.
http://en.wikipedia.org/wiki/Phosphoric_acid
H3PO4
The phosphoric acid converts reddish-brown iron(III) oxide,
Fe2O3 (rust) to black ferric phosphate, FePO4
The black ferric-phosphate coating can be scrubbed off,
leaving a fresh metal surface.

Here is the Henkel MSDS:
http://www.henkelcamsds.com/pdf/5534...issolver.p df
Loctite Naval Jelly Rust Dissolver
Henkel Corporation, 32150 Just Imagine Drive, Avon, Ohio 44011
Telephone: 800-624-7767 (emergency 800-424-9300)
Phosphoric acid (CAS 7664-38-2) 10-30%
Phosphate ester 1-5%
Isopropyl alcohol (CAS 67-63-0) 1-5%
Polysaccharide 1-5%
Sulfuric acid (CAS 7664-93-9)0.1-1%
Water 50%
pH 1.5 - 2.5
Forms Hydrogen, by reaction with metals

The Loctite MSDS shows a slightly different composition:
http://www.loctiteproducts.com/techdata-msds.shtml
Phosphoric acid (CAS 7664-38-2) 10-30%
2-Propanol (CAS 67-63-0 1-5%
Sulfuric acid (CAS 7664-93-9) 0.1% - 1%
Silicon dioxide (CAS 7631-86-9 ) 0.1% - 1%
Diiron trioxide (CAS 1309-37-1 ) 0.1% - 1%
Magnesium oxide (CAS 1309-48-4 ) 0.1% - 1%
Aluminum oxide, (CAS fibrous 1344-28-1 ) 0.1% - 1%
pH 1.5 - 2.5

The Loctite technical datasheet at the same location says
to brush it on metal, leave for 5 to 10 minutes, and wash off.

The Permatex version of naval jelly MSDS says:
http://ecx.images-amazon.com/images/I/61w2z5V6VMS.pdf
10 Columbus Blvd., Hartford, Connecticut 06106, 877-376-2839
Permatex Naval Jelly Rust Dissolver is an acid based
thixotropic liquid for dissolving rust on iron and steel surfaces.

Having read all this - I wonder if pool accid (muriatic acid,
hydrochloric acid) will work (since I already have lots of that)?

Googling ...

Gosh. To much science involved for me. Use Navel Jelly I say :-\


Reading this, I'd be tempted to try Coca Cola as a rust remover.
I believe it has phosphoric acid in it.

Ketchup.

Greg

I have a very old brass boat propeller. Ketchup is the suggested way
to clean it. Allow the tomato acid to work. Rinse and clear coat, but
I'm not that far yet. I would trust Ketchup. Can't say for rust
though..