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Jan 25, 2018 15:11:53 GMT
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Hi all Going to try citric acid to remove some rust on old tools etc (trial run for car parts) Got the mix ratio (1 heaped tablespoon / litre water) but my question is simple, do I mix it with hot, warm or cold water ?? Thanks
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BMW E39 525i Sport BMW E46 320d Sport Touring (now sold on.) BMW E30 325 Touring (now sold on.) BMW E30 320 Cabriolet (Project car - currently for sale.)
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Jan 25, 2018 15:21:50 GMT
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Cold water and always add the acid to the water, not the other way round. The reaction is exothermic so can boil small quantities of water quickly.
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Jan 25, 2018 23:09:22 GMT
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Not with the amount of citric you're using it's not!
I've added it straight into boiling water, no issues. Hell, you can oversaturate water with citric crystals and it won't get warm....because it's not exothermic, it's endothermic, it takes far more energy to break down the crystals than you get with the acid hydration.
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Last Edit: Jan 25, 2018 23:15:34 GMT by phillipm
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Jan 25, 2018 23:50:08 GMT
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Ok Many thanks
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BMW E39 525i Sport BMW E46 320d Sport Touring (now sold on.) BMW E30 325 Touring (now sold on.) BMW E30 320 Cabriolet (Project car - currently for sale.)
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Jan 26, 2018 11:09:24 GMT
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I used warm water rather than cold just because it seems to dissolve better - I find I can be stirring the jug for quite some time with cold water. Same for washing soda crystals. 10% concentration is the mixture I use, I've never tried it stronger.
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Jan 26, 2018 14:30:47 GMT
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Thanks Going to try some old stuff first as a trial run Makes sense about disolving better in warm water though
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BMW E39 525i Sport BMW E46 320d Sport Touring (now sold on.) BMW E30 325 Touring (now sold on.) BMW E30 320 Cabriolet (Project car - currently for sale.)
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Jan 26, 2018 16:15:51 GMT
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It'll also work a lot faster if you keep the water hot.
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v8
Part of things
Posts: 299
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Jan 27, 2018 10:25:26 GMT
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I used hot water straight from the tap and mixed in as much acid powder as would dissolve.
Stripped of rust and old Zinc plating no problem, it works far better in warm weather and parts need to be de-greased first.
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stuey
Posted a lot
ram thruster 4000
Posts: 1,010
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Jan 29, 2018 19:16:26 GMT
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try oxalic acid you can buy it from ebay its great for de rusting and works wonders on chrome.
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1987 fiat 126-nearly actually done! 1972 beetle - lawn art 2003 z4 daily-new wheels a comin! 2008 R56 Mini cooper "mental Mickey"
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Jan 30, 2018 10:37:16 GMT
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I've used that to good effect when the item I want to clean is bigger than the amount of citric acid I'm prepared to mix. Washing soda is so much cheaper than acid powder. Milkstone remover is pretty effective too, as is a product called "ph Down" (sold for hydroponics) as they are both some type of acid that removes rust - I can't remember which one and don't want to guess.
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