doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Annealing Problem - Help and Advice requested!

I'm with OB, Muratic Acid (swimming pool acid) will clean the parts like new....any crustation or oxide will be removed A.S.A.P.....use heavy nylon fishing line to submerge each part, then dip immediately into a fresh water pail/bucket....inspect and re-dip as needed.........then as OB said, oil immediately.....

I use it at 75 acid- 25 water- (sometimes at 100% acid) and have had great results with all kinds of metal parts, guns, airplanes, engines and so forth.....you must stand over the process as the time submerged must be watched........don't run off to answer the phone..........

Do this process outside and do not breath the fumes.........common sense rules here.......and have a water hose running slowly along side this process.......

If you have an oil stained concrete driveway, use the muriatic acid to clean your driveway while you're at it.

Thanks guys. Once again here in the UK I can't seem to get hold of it higher than 36% will that do the job albiet slower?? thanks chuck for the tip!

TT

this is the strongest ive found so far fellas;

http://cgi.ebay.co.uk/Hydrochloric-Acid-36%25---Brick-%26-Patio-Cleaner-5-litres_W0QQitemZ130371604843QQcmdZViewItem?rvr_id=&rvr_id=&cguid=c354b2321230a0aad3b48f74fefec0d3

Surely they sell "swimming pool acid" in the UK...which is "Muratic acid"..............in the U.S. it can be purchased at most grocery stores in the warmer climate areas...........I know they sell it in Italy and Spain because I have bought it there.......?........U.K., not sure...........

And Chuck, I didn't think your cars and trucks leaked oil.....?............You could also use it to clean your BBQ grates.........!.......(probably against the law in California...?)

will keep trying Doug might find it somewhere...that 36% brick cleaner not good enough?

Tony:

I think the Hydrochloric Acid Brick cleaner @ 36% would be very weak for etching and cleaning metal parts..........JMO.........I would call a 'swimming pool' supply house in one of your larger cities, I am sure they would have Muratic Acid full strength...?.......Any good hardware store should also have it....?........Maybe your laws do not allow full strength acid to be sold...?...........?......

Yep OK will try but the UK is extremely strict over this sort of crap...crazy...will try pool supplier tomorrow

Cheers

http://en.wikipedia.org/wiki/Hydrochloric_acid

The link above will tell you about hydrochloric acid.

I was thinking common "pool supply" muriatic acid was quite a bit less than 100%, thinking around 40%. Turns out that about 40% is about all that can be produced.

The strength needed seems to be about 18% for steel pickling. 36% would surely be effective at stripping the oxide scale.

From wikipedia

Pickling of steel
One of the most important applications of hydrochloric acid is in the pickling of steel, to remove rust or iron oxide scale from iron or steel before subsequent processing, such as extrusion, rolling, galvanizing, and other techniques.[6][8] Technical quality HCl at typically 18% concentration is the most commonly used pickling agent for the pickling of carbon steel grades.

MuraMic Acid.