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Ammonia + Aluminum?

I was reading all of the labels on things in my house, mostly spray-able things like spray paint, spray adhesive, spray enamel, etc., etc., to see what's flammable, and on the bottle of ammonia we have it says "Do NOT use to soak aluminum utensils in...." or something like that. What does ammonia + aluminum equal or do? Is it flammable? Thanks all you chemistry-buffs!

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Kiteman9 years ago
Ammonia is corrosive to aluminium, so if you soak your aluminium cuttlery in it, you'll only do it once...
Yonatan24 Kiteman11 months ago

That's my dad's joke!

He always says "if you __blank__, you'll only do it once"

This ability to corrode aluminium is why this may work by dissolving the existing oxide of aluminium Keep adding a few drops of ammonia and tapping round the outside of the seat downtube. Gripping with a self grip wrench and twisting the alloy stem. Personally I would heat the tubing and trickling brake fluid or 3 in 1 oil round the joint while still hot. wrapping a cold wet cloth round the alloy to cool that quicker than the rest. You may have to repeat it but keep trying

nurdee14 years ago
I saw this on my bottle also. and guess what I had to try it. Nothing spectacular happens. I put some aluminum foil in a test tube and poored ammonia over it, the only thing that happened was that the aluminum darkens and little bubbles of gas are released. The gas is hydrogen. Unfortunately the build up is very slow and the reaction doesn't create much heat so there is no explosion. Bummer.
I am trying to remove an aluminum seatpost from a steel bicycle frame. A recommend method of getting the seized part unstuck is to put ammonia between the tube and the seatpost because it will dissolve the aluminum oxide. However the posts above seem to say that ammonia will cause aluminum to oxidize, which would only make matters worse. Can anyone shed light on whether putting ammonia in the tube would help me un-stick the seat post? Is there another method of de-oxidizing aluminum? Also, are there penetrating oils that would work on aluminum? I was informed that WD-40, Liquid Wrench, etc. will work on steel-steel rust but will not un-stick steel-aluminum rust.
soak the aluminum corrosion with brake fluid. automotive distributers corrode in cast iron blocks all the time and paoring brake fluid around them and letting it soak always works
me too. Trying to remove a frozen/corroded aluminium handlebar stem from a steel bike. I've twisted and sprayed and finally resorted to ammonia. Did you have any success roundaboutit?
I have the same problem and from a bit of Googling (stuck aluminum seat post) it appears that either ammonia or caustic soda (sodium hydroxide) should do the job. Caustic soda (NaOH) is probably more dangerous to you than household ammonia, it's the main ingredient in "Drano". To get it into the gap between seat post and frame it seems to be suggested to put the frame upside down, block the hole with a cork, and pour the ammonia or NaOH in thru the bottom bracket. Take care and use PPE (goggles, gloves, long sleeves etc.). And be patient!
omnibot7 years ago
OMFG I LOL'ed sooo hard at these comments. Piss and coke-cans .. thefuel of the future. Priceless. Here I go :
-Ha ha harr harr hir hirr ho ho ho moho mo ho  mo .. MOAH HA HA HAAAAA!!!!
I am trying to remove an aluminum seatpost from a steel bicycle frame. A recommend method of getting the seized part unstuck is to put ammonia between the tube and the seatpost because it will dissolve the aluminum oxide. However the posts above seem to say that ammonia will cause aluminum to oxidize, which would only make matters worse. Can anyone shed light on whether putting ammonia in the tube would help me un-stick the seat post? Is there another method of de-oxidizing aluminum? Also, are there penetrating oils that would work on aluminum? I was informed that WD-40, Liquid Wrench, etc. will work on steel-steel rust but will not un-stick steel-aluminum rust.
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