netneut
finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing


Finishing.com has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
HomeFAQsBooksHelpWantedAdvertiseForum
topic 338

Zinc plating & chromating of Carburetors


(1996)

Q. I am looking for info on Zinc plating carburetors and was wondering if this could be done by immersion plating?

Also black chromate on older carburetors with an aluminum alloy in them?

Robert Grabell
- Canada


A. You can immersion deposit zinc on aluminum, Robert; the process is called zincating. However, this finish is neither durable nor attractive -- rather it is used as a base for subsequent electroplating. If the carburetor is zinc, you could for example copper-nickel-chrome plate it, or you could zinc electroplate it and chromate conversion coat it. A possible reason for zinc electroplating and then chromating rather than simple chromating is so that you can chromate it more consistently.

Both aluminum and zinc can be chromate conversion coated (which is an immersion process), and the chromate can be black, or gold, red, or blue. But chromating an old raw die casting, whether zinc or aluminum, will probably give you a mottled, inconsistent finish that you won't be happy with. Chromating the electroplated zinc may be more aesthetically pleasing.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

June 21, 2013

Q. I am curious if anyone here has vast experience with zinc plating carburetors, or doing the original zinc dichromate finish on them when they were brand new.

I've heard it may be necessary to zinc electroplate a stripped carb body before immersion dipping them in dichromate, to prevent blotchy results. I have also heard that if you zinc plate a carb, and then dichromate it, you will end up with that cheap China tool look, instead of the nice original zinc dichromate finish.

If anybody worked for Holley or other manufacturers and did this process when they were new, I would love to know if the carbs were electroplated first.

On a related note, does anybody have experience with any other colors than yellow? It seems like some carburetors were more of an olive-drab color than yellow. And I would be interested to hear about results using black, or a more tan than yellow.

Could it be possible to mix say the yellow with a little black, to get a more tan color?

Steve Hulett
- Ocala, Florida USA



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.