rare earth magnets

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Almost all of the rare earth magnets I have had eventually lose there chrome or nickel. I have purchased from different vendors.
Is this because the ones I notice it are used to hold tools, and things like the the drill chuck key.
Is it because they are banging the magnet?
Is it because the magnets are so strong the chrome just can't handle the polarization?
Is it the quality of the magnets?
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On Sat, 24 Mar 2012 15:16:04 -0400, tiredofspam <nospam.nospam.com> wrote:

I've had the same luck. Some seemed to have chipped with only rare use or contact.
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"Zz Yzx" wrote in message
On Sat, 24 Mar 2012 15:16:04 -0400, tiredofspam <nospam.nospam.com> wrote:

I've had the same luck. Some seemed to have chipped with only rare use or contact. ===================================================================It would seem that the chrome doesn't stick to well to the magnets. I have seen the same thing. It appears that they plate the magnets directly. Usually, a part is copper plated first before chroming. Copper seems to stick well to most things but chrome does not. Chrome does stick to copper very well though. It's likely just a cost cutting measure.
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On 3/24/2012 2:16 PM, tiredofspam wrote:

There are better built rare earth magnets that will not chip and IIRC they do not have a thin chrome coating.
Apparently an indestructible plastic coating protects these magnets.
http://www.kjmagnetics.com/products.asp?cat 4
And their other stuff.
http://www.kjmagnetics.com/categories.asp
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Thanks, Have you used the rubber units? I hadn't seen them before. For some items that makes sense. For others not sure. I think I like the chrome look.
But for shop stuff the rubber will solve the problem. Nice the fact that they become less prone to slide.
On 3/24/2012 9:20 PM, Leon wrote:

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On 3/25/2012 10:46 AM, tiredofspam wrote:

No, I have not tried any of those magnets.
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Wowsers!! What a wealth of tinker/prototype/jig solutions..Thankee muchly for that link there, Leon!
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"Robatoy" wrote in message wrote:

Wowsers!! What a wealth of tinker/prototype/jig solutions..Thankee muchly for that link there, Leon! ==============================================================Check out their largest one. 4" diameter x 2" thick. Over 1000 pounds pull. I don't think I'd feel safe with that one.
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wrote:

That baby could probably erase your credit cards from across the room!!!!!!!!!!!
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"EXT" wrote in message wrote:

That baby could probably erase your credit cards from across the room!!!!!!!!!!! =============================================================If you got it stuck to something, I have no idea how you would get off.
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Note that the "Smaller" ones (i.e. 3/4" X 1/8") from Woodcraft or Lee Valley are only sold in stacks of 5 or 10, because it takes too much labor to break them down into small er stacks.
-Zz
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Zz, How do they get the plating in between the magnets in a stack of 5 or 10? Thanks, Kerry
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On 3/25/2012 6:12 PM, CW wrote:

I recon if the magnet is attached to a fixed object it would effectively weigh 1000 lbs. Probably would not be a hazard. BUT Imagine the UPS guy trying to get it out of his truck!
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On 3/25/2012 9:24 PM, Leon wrote:

Good thing auto bumper are plastic these days ...
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On 3/26/2012 6:38 AM, Swingman wrote:

Yeah and most likely most of the UPS cab is aluminum. But think of all the crap in the other packages that would be stuck to the magnet.
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I'm wondering if they'd use some type of "canceling" magnet just for shipping purposes ~ Something similar to the Lee Valley canceling magnets.
http://www.leevalley.com/en/wood/page.aspx?cat=1,43838,47843&pV000
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"Leon" wrote in message
On 3/26/2012 6:38 AM, Swingman wrote:

Yeah and most likely most of the UPS cab is aluminum. But think of all the crap in the other packages that would be stuck to the magnet. ===================================================================I imagine it would come in a really big box.
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You're right. I can envision even a minor fender bender causing a car and the UPS truck to get stuck together because he was delivering high powered magnets.
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On 3/26/2012 7:47 AM, Dave wrote:

Hey ... with the obvious advancing state of magnetism, it could happen! ;)
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Even more ridiculous (or likely). A car passing a UPS truck and they get stuck together. :)
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