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Old February 25th, 2011, 10:59 AM #1
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Question Zinc wheel weights

After several years of using a long-ago collection of wheel weights for casting, I recently obtained a bunch of used wheel weights for a lead source. I am aware that the industry is starting to use zinc instead of lead for wheel weights, at least in some places.

Now the problem. For casting purposes, you definitely do NOT want the lead contaminated by zinc. It causes all sorts of problems, generally resulting in the need to discard a batch of lead.

I am pretty sure that zinc has a significantly higher melting point than lead but am not sure how careful you need to be to separate out the zinc weights from the lead and, if one gets into the melting pot anyway, how obvious is it that it is not lead before it begins to melt into the lead? Fortunately, I have not yet run into this little problem.

Any experience with this or any advice? Any reliable zinc detection methods that you recommend for sorting purposes? (I do know that zinc is much harder than lead but have not yet experimented with a scratch test. I suspect that is the way to go but verification would be helpful.)
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Old February 25th, 2011, 11:40 AM #2
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Zinc magnet?

Seriously, I've always found that there is a difference in the feel of zinc and lead.

Also zinc's melting point is 787 F vs lead's of 621 F. That's a big difference (166 F). I'd think that the solid chunk of zinc would just float to the surface without melting.
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Old February 25th, 2011, 11:44 AM #3
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http://www.shootersforum.com/showthread.htm?t=54481



great write up for you a must read
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Old February 25th, 2011, 12:30 PM #4
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Hang on your horses there cowboy, this question needs to be addressed to a metallurgist, not a gun forum.
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Old February 25th, 2011, 12:35 PM #5
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Quote:
Originally Posted by PapiBarcelona View Post
Hang on your horses there cowboy, this question needs to be addressed to a metallurgist, not a gun forum.
Pull up on the reins there, pardner...if they's a asking knowledgeable folk on a gun board, they likely must've gotten the info from metal-whatever-kind of dude. Yes?
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Old February 25th, 2011, 12:42 PM #6
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Lol

Don't know where people get their info from, that's why a lot of bad info is out there. Fair enough you would be right for some instances, but professional opinions I think is a good start somewhere in the the process!
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Old February 25th, 2011, 12:48 PM #7
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Lol

Don't know where people get their info from, that's why a lot of bad info is out there. Fair enough you would be right for some instances, but professional opinions I think is a good start somewhere in the the process!
Welcome to the board, Papi.

There is some wrong info on this board, but someone will come along and correct it, or offer where to get the straight info...or both.
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Old February 25th, 2011, 12:52 PM #8
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Quote:
Originally Posted by PapiBarcelona View Post
Hang on your horses there cowboy, this question needs to be addressed to a metallurgist, not a gun forum.
A metalurgist doesnt need to respond for simple questions like these, thats why they are asked, because ther are a multitude of proffessionals on this forum from a multitude of fields.


oh and lead melts 622f
zinc is at 787f
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Old February 25th, 2011, 12:57 PM #9
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Hydrochloric acid is not easy to get, but a dilute form of hydrochloric acid called muriatic acid is readily available at paint stores. Put a drop on the suspected piece of zinc. If it reacts, it's zinc, otherwise it's lead.

Jim
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Old February 25th, 2011, 12:58 PM #10
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Hang on your horses there cowboy, this question needs to be addressed to a metallurgist, not a gun forum.
I'm not a metallurgist so I won't comment on what happens when zinc is alloyed with lead but I can tell you that solid zinc will float in molten lead.


   
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