-- The Home Page of the Finishing Industry
  HOMEFAQsBOOKSHelpWantedAdvertiseContactFORUM Letter 44257

The Hotline: Serious Education ... plus the most fun you can have in metal finishing. Ted Mooney, Webmaster

Zinc Iron Plating (black) Vs. Zinc Plating (black)


Hello all, I would like to post this question about platings. I know there are many different blends and processes (Barrel vs rack, etc) for performance and plating. I'm currently researching Zinc plating for an automotive component that will be exposed to the environment.

So, part of my research is to optimize the plating process. My questions are: which one performs better for long term corrosion protection?
I get mixed signals on costs of both, so anyone can give me a general idea for cost comparisons between the two? I was told Zinc Iron is much cheaper...

Also, how much would Zinc Iron affect the quality of the surface. Is black going to be black or will it be brown?

Would love some help with this research to get a better idea where I stand.

Jason Miller
Oakland University - (PhD. Student) - Rochester, Michigan, USA


Zinc alloys are more corrosion resistant than plain zinc plating, primarily because the electromotive potential can be engineered by picking the right alloy content. This also makes them more expensive and somewhat more difficult to operate.

Zinc-iron offers the best black color and stability; I believe it's because the iron content offers a metal that can be blackened whereas black zinc must rely on silver (which changes color) or dyes which lack stability. I am not a chemist in this area, but have been to plating shops which solved their problems with black finishes when they switched from zinc to zinc iron.

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

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

Disclaimer: It is 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; 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. & DevicesUsed & Surplus

©1995-2015     -    Privacy    -    Search