Technical & Reference Section > Tech and Restoration

what container do you use when doing a OA bath

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oldschoolace:
This is my usual rig for citric acid. Pound shop specials  :daumenhoch:

kalex:
does citric acid work the same as oxalic acid

where can you get it from and in what form does it come in

oldschoolace:
As far as i know they work exactly the same. Citric acid comes in granules like sugar and you can get it from any home brew supply shop or cheaper on the bay. Totally safe too as most drinks and tons of food contain it.
the residue you see in the pic is what came of this frame  :daumenhoch:

Before




After

kalex:
very good results you've got there  :daumenhoch:

i chucked the kids little blow up pool out last year

what type of ratio did you use and time scale

Dannywhac:
I use Citric as every now and again you get a frame with sh1t chrome, and OA can leave 'bruise' stains (which sometimes can be polished out) whereas CA doesn't. Plus like OSA says, CA's a bit easier going than OA.

Homebrew supplies will do 500g of CA for around the £4.50 mark, or get it on eBay cheaper:

http://www.ebay.co.uk/itm/500g-CITRIC-ACID-FOOD-GRADE-HOME-BREW-WINE-MAKING-/150718206562?pt=UK_HomeGarden_CLV_Cleaning_CA&hash=item2317815262

http://www.ebay.co.uk/itm/1000g-1kg-Citric-Acid-food-grade-Long-shelf-life-for-brewing-bath-bombs-descaler-/270958120373?pt=UK_Home_Garden_Food_SM&hash=item3f165ccdb5

Ratio - depends on how long you can leave it in the container - slower = better results with a slightly weaker solution. 20:1 (as in gallons to kg), or a half full bath with around 400/500g in it will do it's work over 24-48 hours depending on the rust. You should keep an eye on the frames etc, and every now and again give the stubborn bits a going over with a toothbrush or washing-up scourer (gently).

Should be said - if the item you're cleaning isn't chrome (ie rusty bare metal) both CA and OA will shift the rust, but make the metal have a 'dusty' dark oxide on it's surface.

Always thoroughly rinse (including inside tubes) with clean water after you've dipped them, dry them off on a radiator or somewhere warm, and give tube insides a few squirts of WD or similar to make sure there's no acid still working away inside.

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