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The Disappointment of buying NOS Chromed pot metal.
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56D500boy
Posted 2018-05-21 7:26 PM (#563789)
Subject: The Disappointment of buying NOS Chromed pot metal.



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Sad but true. It seems that even though a chromed pot metal part has never been on a car, it seems to always have some pitting and/or bubbles.

I guess that I was/am naive about "NOS" when it comes to chrome bits.

Case in point, I purchased and just received a NOS 1956 rear trunk "Vee" . It is very nice. Very NOS (never been on a car). But yet, there are a few bumps in the chrome (I knew about some but not all of them).

This one:

https://www.ebay.ca/itm/56-1956-DODGE-TRUNKLID-LIFT-ORNAMENT-NOS-164...



Last year I bought two of the big double-pronged hood "ornaments" off eBay. One was advertised at NOS and was shown to still be in the original cellophane protective wrapping. Both were very nice but neither was perfect. Go figure. I will use one of them.

In any event, they're all better than what came on the car by a long shot. I guess the only way to have perfect pot-metal chrome is to have it redone. Not going to happen on my car.

I have to keep remembering that I am only trying to make my car "better", not perfect.

The NOS hood ornament was this one:



Edited by 56D500boy 2018-05-21 7:30 PM




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Powerflite
Posted 2018-05-21 7:45 PM (#563790 - in reply to #563789)
Subject: Re: The Disappointment of buying NOS Chromed pot metal.



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Just wait till you mount them on your car and monitor them after 6 years. I am wondering if a lot of that problem could be averted if a different metal was plated onto the pot metal before the copper & nickel, like Titanium or maybe cadmium. I don't know the answer, but I bet there is a better way to do it. Using a purer form of zinc would probably help a lot too.

Edited by Powerflite 2018-05-22 2:03 AM
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Doctor DeSoto
Posted 2018-05-22 1:43 AM (#563807 - in reply to #563790)
Subject: Re: The Disappointment of buying NOS Chromed pot metal.



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I really don't think chrome looked as good as people think it did when
new in the 50's. Our paradigm is "show quality" modern plating and
polishing, and that just wasn't the case. Our pot metal was directly
chromed, .... no copper or nickel. It pitted just sitting on the shelf.
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Powerflite
Posted 2018-05-22 2:04 AM (#563809 - in reply to #563789)
Subject: Re: The Disappointment of buying NOS Chromed pot metal.



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Location: So. California
It must have nickel, otherwise it would look gray from the zinc. Chrome is transparent, so what you are seeing is the nickel underneath it. And copper is used for better adhesion of the different metals. I think the galvanic corrosion occurs between copper and zinc, so something in between those layers might help.
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1960fury
Posted 2018-05-22 7:47 AM (#563812 - in reply to #563807)
Subject: Re: The Disappointment of buying NOS Chromed pot metal.



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Doctor DeSoto - 2018-05-22 1:43 AM

I really don't think chrome looked as good as people think it did when
new in the 50's.


I bought used pot metal pieces in the 80s from the southwest which were about perfect, perfect shine with no bubbling or imperfections at all. of course it was a bit rough around the edges. This is how they came. Do not expect new car plastic-cast perfection.
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56D500boy
Posted 2018-05-22 10:15 AM (#563822 - in reply to #563807)
Subject: Re: The Disappointment of buying NOS Chromed pot metal.



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Location: Lower Mainland BC
Doctor DeSoto - 2018-05-22 1:43 AM Our paradigm is "show quality" modern plating and
polishing, and that just wasn't the case. Our pot metal was directly chromed, .... no copper or nickel. It pitted just sitting on the shelf.


Based on what I am seeing with NOS bits, from now on I will know that flawless "Show Quality" = over restored and better than factory, at least on the pot metal bits.

There has to be a layer of something between the zinc pot metal and the chrome. Some of the bits on my car have been polished to the point that they are starting to look at bit yellow.
Which I take it is the underlayer. I was going to guess brass (copper and zinc) but it could just be a copper layer.

In any event, I know have some bits to replace with these new, albeit, slightly flawed, parts.

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big m
Posted 2018-05-22 11:08 AM (#563825 - in reply to #563789)
Subject: Re: The Disappointment of buying NOS Chromed pot metal.



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NOS parts have been setting on a shelf since new, or in a damp cellar, or riding around in a swap meet vendor's truck over the years.

Rarely ever do I see parts that don't show deterioration, even in factory packaging.

---John
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BigBlockMopar
Posted 2018-05-22 2:13 PM (#563837 - in reply to #563789)
Subject: Re: The Disappointment of buying NOS Chromed pot metal.



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Exactly, you never know the shelf history of a part.
Cardboard boxes easily capture moisture or condensation.
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