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Author Topic: Zinc Dichromate Plating source  (Read 1252 times)

Offline StevenTuck

  • Posts: 1054
  • CLC Member # 16507
  • Name: Steven M. Tuck
Zinc Dichromate Plating source
« on: April 19, 2017, 01:40:52 PM »
Anyone have a good source for zinc dichromate plating? I need to send out my hood hinges and latch.
« Last Edit: April 19, 2017, 01:47:27 PM by StevenTuck »
1962 Cadillac Eldorado Biarritz
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Offline Jeff Wilk

  • J. Wilk CLC # 25630
  • Posts: 1324
  • The Past + The Future = My Heaven on Earth
  • Name: Jeff Wilk
Re: Zinc Dichromate Plating source
« Reply #1 on: April 19, 2017, 09:22:23 PM »
These folks do amazing work.....

http://m.sms-auto.com/

Jeff
"Impossible Only Describes The Degree Of Difficulty" 

Southern New Jersey

1959 Cadillac Fleetwood Sixty Special
1975 Eldorado Convertible (#12 made)
1976 Cadillac Mirage (factory authorized Pick-Up)
1933 Phaeton Chevrolet - "Baby Cadillac"
1933 Master Sedan Chevrolet - "Baby Cadillac"

SOLD
1958 Cadillac Sixty-Special
1958 Cadillac Sixty-Special
1958 Cadillac Sedan
1958 Cadillac Coupe Deville

Offline Bobby B

  • Posts: 2732
  • Mendham, New Jersey
  • Name: Bob Bender
Re: Zinc Dichromate Plating source
« Reply #2 on: April 19, 2017, 09:44:47 PM »
Anyone have a good source for zinc dichromate plating? I need to send out my hood hinges and latch.

Steven,
 Hi. Where are you located?
                              Bobby
1947 Cadillac Series 62 Convertible Coupe
1968 Mustang Convertible
1973 Mustang Convertible
1969 Jaguar E-Type Roadster
1971 Datsun 240Z
1979 H-D FLH

Offline StevenTuck

  • Posts: 1054
  • CLC Member # 16507
  • Name: Steven M. Tuck
Re: Zinc Dichromate Plating source
« Reply #3 on: April 20, 2017, 07:17:05 AM »
Steven,
 Hi. Where are you located?
                              Bobby
Land O Lakes, Florida which is outside Tampa
1962 Cadillac Eldorado Biarritz
http://bit.ly/1NfPNHE
Car Show Signs and Car Photo Books
http://carshowsigns.net/

Offline Classic

  • Posts: 638
  • CLC # 474
Re: Zinc Dichromate Plating source
« Reply #4 on: April 20, 2017, 10:20:48 AM »
In your area, I would talk to Dave Pratt at Space-Coast Plating in Melbourne, FL   (321) 254-2880.  He does a lot of collector car chrome plating and has great reviews.  However, I don't believe he does zinc or cadmium plating, but surely he knows who does and can recommend someone.

Gene Menne
CLC #474

Offline StevenTuck

  • Posts: 1054
  • CLC Member # 16507
  • Name: Steven M. Tuck
Re: Zinc Dichromate Plating source
« Reply #5 on: April 21, 2017, 08:29:58 AM »
Thank you all. I checked out Jeff Wilk's recommendation on SMS Auto. They didn't do Zinc Dichromate but referred me to Castle Cadillac, Frank Nicodemus. They do it and are giving me a quote. I also located a guy in California who mainly does brake boosters but he also does this plating. He gave me a quote. Let's see what Castle Cadillac quotes me. I have a feeling they will give me a closer match.
1962 Cadillac Eldorado Biarritz
http://bit.ly/1NfPNHE
Car Show Signs and Car Photo Books
http://carshowsigns.net/

Bill Young

  • Guest
Re: Zinc Dichromate Plating source
« Reply #6 on: April 22, 2017, 09:19:23 PM »
Frank Nicodemus does excellent work. He did a 1968 DeVille Convertible for me.

Offline fishnjim

  • Posts: 2430
  • Name: J. Bozin
Re: Zinc Dichromate Plating source
« Reply #7 on: April 25, 2017, 01:01:11 PM »
I believe dichromate is a post treatment, not an actual plating solution.   The part is first zinc plated then dipped in the dichromate solution, which is hexavalent*, and imparts a chrome yellowish color on the surface to prevent the white zinc oxide from forming.   Are you sure that's the correct method for these parts?   
A lot of car parts were either dull zinc or cadmium plated.   They don't do the old zinc method any more, changed around the mid 60's, and that's why all the modern fasteners are bright zinc.
* - plating is usually done at the lowest valence.

Offline 7gen

  • Posts: 187
  • Name: K. Reynolds
Re: Zinc Dichromate Plating source
« Reply #8 on: April 25, 2017, 04:00:19 PM »
I'll put in a plug for Frank Nicodemus at Castle Cadillac as well. I needed some work done and he was not able to do it but called around his extensive network of trusted vendors and found me someone. I was very appreciative of the effort he went to in order to ensure I got what I needed.

Offline StevenTuck

  • Posts: 1054
  • CLC Member # 16507
  • Name: Steven M. Tuck
Re: Zinc Dichromate Plating source
« Reply #9 on: April 26, 2017, 08:12:00 AM »
I believe dichromate is a post treatment, not an actual plating solution.   The part is first zinc plated then dipped in the dichromate solution, which is hexavalent*, and imparts a chrome yellowish color on the surface to prevent the white zinc oxide from forming.   Are you sure that's the correct method for these parts?   
A lot of car parts were either dull zinc or cadmium plated.   They don't do the old zinc method any more, changed around the mid 60's, and that's why all the modern fasteners are bright zinc.
* - plating is usually done at the lowest valence.
yes you are correct in that to achieve zinc dichromate the piece is zinc plated then put in a yellow chromate conversion bath. The conversion bath gives that green pink rainbow color. Here is a picture of the hood side of my hinges which shows this finish.
1962 Cadillac Eldorado Biarritz
http://bit.ly/1NfPNHE
Car Show Signs and Car Photo Books
http://carshowsigns.net/

 

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