Some Research I Have Done On Why No Laminations On Zinc Cents - Page 2

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Pete2226 Pillar of the Community United States 3330 Posts	Posted 06/07/2019 09:45 am 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 Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 06/07/2019 09:51 am 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 Materials¹ 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.² 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 Report this Post to the Staff
Conder101 Bedrock of the Community United States 17884 Posts	Posted 06/07/2019 11:45 am While laminations are seldom seen in modern coins they CAN occur in clad, solid alloy AND plated zinc cents. Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 06/07/2019 12:56 pm 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! Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 06/07/2019 2:30 pm Halo: That coin was struck through a piece of plating foil. Note under the raised plating, your see copper color, not gray like zinc. Edited by coop 06/07/2019 2:56 pm Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 06/07/2019 2:37 pm Stoneman: It looks like letters from a reverse of a quarter/some othercoin on the bust of Lincoln? Report this Post to the Staff
Halo1st Pillar of the Community United States 2775 Posts	Posted 06/07/2019 3:28 pm 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. Edited by Halo1st 06/07/2019 9:58 pm Report this Post to the Staff
Pete2226 Pillar of the Community United States 3330 Posts	Posted 06/08/2019 06:32 am 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! Report this Post to the Staff
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