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Thread: Identifying Aluminium
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6th August 2013, 05:55 PM #16
forgot to say some thing about " zinc fumes " there nasty , not too bad at aluminum temps , but at copper temps , zinc will fume as a white smoke , dont breath it in , it will mess with you , they say a lot of milk helps , best not to breath it in , a P100 filter in a respirator works
how come a 10mm peg dont fit in a 10mm hole
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12th August 2013, 02:31 PM #17GOLD MEMBER
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12th August 2013, 05:04 PM #18
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15th August 2013, 10:37 PM #19Senior Member
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I always thought that you can tell aluminium with a magnet it wont pick it up,
Eddie
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15th August 2013, 11:32 PM #20
Austenitic grades of stainless steel are also non-magnetic.
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15th August 2013, 11:39 PM #21.
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It's not a good test because most metals are nonmagnetic.
A really neat way to test for Al is using Bromoform because Al will float in it whereas almost all other metals will not.
To discriminate between Al and Mg the heavy liquid to use is Dibromomethane , Mg floats but Al sinks.
Unfortunately these chemicals a pretty toxic so you need a fume hood to handle them
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16th August 2013, 12:21 AM #22
BobL beat me to it, TKO, aluminium, zinc, tin, magnesium, titanium and many many other metals look alike and none of them are magnetic. In fact only iron and nickel containing metal alloys CAN be magnetic (if I remember correctly).
Cheers,
Joe
9"thicknesser/planer, 12" bench saw, 2Hp Dusty, 5/8" Drill press, 10" Makita drop saw, 2Hp Makita outer, the usual power tools and carpentry hand tools...
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17th August 2013, 10:38 PM #23Senior Member
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Thanks for putting me right on the methods ,I always thought that the magnetic test was the way to go,the photo above is a variety of off cuts given to me the other day,and those marked are not magnetic the bright steel looking ones are I think Stainless steel, and not magnetic they have rust which I think is because they have been stored with the rusty steel for many years and it wipes clean with a cloth, the Brass pieces are two inch in dia and the large round pieces are aluminium, I can't tell if the brass pieces are bronze or brass, I have several other longish shafts in molasses up to 2 1/2inchs in dia,,some are very tough and most are mild steel, the oblong piece of steel is 3 x3 x5/1/2 inches, could make some nice big nuts, I'm learning still.
Thanks Eddie.
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18th August 2013, 10:33 AM #24
Some stainless steel is magnetic, some isn't. Depends on the grade. When induction hardening many years ago we had to use SS hose clamps to avoid them heating up and melting the hoses. I was surprised to be asked to harden a SS piece. Another learning experience. I pick up lots of SS and other fasteners at work, left on the ground etc. I use a magnet sometimes as a check with these when sorting. SS can be stained with rust from other pieces but it will not rust. It oxidises and this oxidation looks like rust but it is not. Mostly cosmetic, except in the food industry. Hence the need to pickle it after welding etc.
I am hopeless when it comes to brass, bronze etc. I have not had a lot to do with anything but brass and copper.
Dean
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