Author Topic: Oxalic Acid Baths - Rust Removal (Read 901 times)

Rodgy1970 · « **on:** August 19, 2010, 10:51 AM »

Anybody know the quantities of powder and water for rust removal?

http://shop.ebay.co.uk/i.html?_nkw=oxali...._arr%3D1&_rdc=1

Rodgy1970 · « **Reply #1 on:** August 19, 2010, 08:08 PM »

i've been told the mix is 250 grams of Oxalic Acid to 1.5 litres of warm water in case anybody wants try out

brettypeeps · « **Reply #2 on:** August 19, 2010, 08:15 PM »

That will react with the metal neutralising it. It will turn the metal black as a completed product if it Chrome then I would go for the tin foil and lemon or tin foil and coke Job as it will look awful when finish. I am not sure about re-chrome after but should OK

Be keen to see some before and after pictures

Rodgy1970 · « **Reply #3 on:** August 19, 2010, 08:46 PM »

some before and afters on here bretty

http://www.vintagebmx.com/community/index.php'showtopic=4004702

going to get some and try it out and will put up some results

jT Racing · « **Reply #4 on:** August 20, 2010, 02:20 PM »

wouldn't carbonated water or vinegar do the same thing, or even watered down brick cleaning acid.

Rodgy1970 · « **Reply #5 on:** August 20, 2010, 02:30 PM »

Quote from: J.T.Racing on August 20, 2010, 02:20 PM

wouldn't carbonated water or vinegar do the same thing, or even watered down brick cleaning acid.

Don't know about the carbonated water or brick cleaner but I've used vinegar on small bits and it worked well, but want to do some bigger bits so reckoned this would be easier and cheaper than buying gallons of vinegar.

You can also use citric acid which comes in powder as well.

bigsman · « **Reply #6 on:** August 21, 2010, 01:58 PM »

Citric is less toxic but equally effective as far as I remember but oxalic definitely does the trick and in my experience doesn't blacken the metal in the way that oven pride or the like do. Having said that I've only used OA on big chrome parts (frames forks etc) whereas I use overn pride to de-anno bits n bobs and yeh if you aren't on top of it it will blacken alloys. You can usually salvage even these by polishing tho. Can't remember how much OA I used but I do remember just putting some in to the water bath and watching how fast it was acting and topping up if it seemd slow..no very scientific but no disasters to date!!