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Some Research I Have Done On Why No Laminations On Zinc Cents

 
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Pillar of the Community
United States
3093 Posts
 Posted 06/07/2019  09:45 am  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply

Quote:
If you subscribe to Coin World , you can look it up. It was around December of 2017


I am a CW subscriber, but was not in 2017. Any way you could send me a copy of that article? (Even subscribers cannot access CW archives)!
Edited by Pete2226
06/07/2019 2:43 pm
Pillar of the Community
United States
3093 Posts
 Posted 06/07/2019  09:51 am  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply
I have stumbled on to another observation which may be relevant, although it seems a bit counter-intuitive. I would be interested in any comments.

It is that the lower the Tensile Strength, the less likely a metal is to produce laminations. Here is a summary of that information:

Tensile Strength (UTS)
Incumbent Materials╣
Cent: Copper Plated Zinc Tensile Strength = 26 ksi**
Nickel: Cupronickel Tensile Strength = 96 ksi
Quarter: Cupronickel-Clad C110 = 65.5 ksi
There is a negative linear relationship between tensile strength and adjusted delamination factor.▓
1. ALTERNATIVE METALS STUDY
Contract Number: TM-HQ-11-C-0049
FINAL REPORT
August 31, 2012
Submitted to: United States Mint
801 Ninth Street, NW
Washington, DC 20220
2.https://www.researchgate.net/public...tic_emission
Bedrock of the Community
United States
16016 Posts
 Posted 06/07/2019  11:45 am  Show Profile   Bookmark this reply Add Conder101 to your friends list Get a Link to this Reply
While laminations are seldom seen in modern coins they CAN occur in clad, solid alloy AND plated zinc cents.
Gary Schmidt
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 Posted 06/07/2019  12:56 pm  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply

Quote:
While laminations are seldom seen in modern coins they CAN occur in clad, solid alloy AND plated zinc cents.


I hope someone can provide a photo or a link to an article about lamination on zinc cents. I have seen none, but that does not mean it is impossible!
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 Posted 06/07/2019  2:30 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
Halo: That coin was struck through a piece of plating foil. Note under the raised plating, your see copper color, not gray like zinc.
Richard S. Cooper
Some have asked about my images I use and I'm glad to say, you can now you can see the DVD in sections on youtube:
1. Intro, older coins, toned coins 2. Doubled dies 3. Die events, One of a kind errors 4. So called errors, Coin information 5. Coin information Types and Varieties, Overlays
Jefferson nickel doubled dies Wexler/Rebar complete listings

trail dies:http://www.traildies.com/
Edited by coop
06/07/2019 2:56 pm
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 Posted 06/07/2019  2:37 pm  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
Stoneman: It looks like letters from a reverse of a quarter/some othercoin on the bust of Lincoln?
Richard S. Cooper
Some have asked about my images I use and I'm glad to say, you can now you can see the DVD in sections on youtube:
1. Intro, older coins, toned coins 2. Doubled dies 3. Die events, One of a kind errors 4. So called errors, Coin information 5. Coin information Types and Varieties, Overlays
Jefferson nickel doubled dies Wexler/Rebar complete listings

trail dies:http://www.traildies.com/
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 Posted 06/07/2019  3:28 pm  Show Profile   Bookmark this reply Add Halo1st to your friends list Get a Link to this Reply
Coop, I agree due to the images not showing the under side of the raised section very well.

What caught my eye is the silver piece that seems to be attached to the underside of the raised copper plating. Noted in the center of this cropped image. Thanks, Doug.



Edit: More food for thought. Seems to display some rigidity exceeding that of a piece of plating foil that's considered to only be (x)-microns thick.
Second opinions are always recommended. Rookies thoughts!
Two sides to every coin. The edge makes three.
Side Note: Sometimes I feel like a nut, sometimes I don't.
Edited by Halo1st
06/07/2019 9:58 pm
Pillar of the Community
United States
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 Posted 06/08/2019  06:32 am  Show Profile   Check Pete2226's eBay Listings Bookmark this reply Add Pete2226 to your friends list Get a Link to this Reply
Halo - your photo is interesting, but I know of no way to process it that is not subjective. An in focus photo might help. The plating is designed to be 8 microns thick. Some microscopes have the ability to measure which would add an objective interpretation. Plating will show some rigidity when peeling, I think.

By the way, I published this paper on another forum and it received a response from Mike Diamond, who said:


Quote:
I've seen examples where the copper plating is cracking and peeling, but no examples in which copper plating has been deposited on a zinc core which has experienced delamination.

I don't see why pure (or nearly pure) discs of zinc shouldn't experience the occasional lamination error. After all, the pure copper Half Cents and large cents of the 19th century certainly had their share. My knowledge base is not the entirely of human experience.


Makes me want to double the call for examples!
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