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topic 28621

Electrogalvanizing vs. zinc electroplating


2004

Q. What is the difference between electro-galvanizing and bright zinc plating? We have a subassembly that has a standard black oxide finish on all of the components. A customer wants the unit galvanized. Due to close operating tolerances it cannot be hot-dipped galvanized. The next best solution looks like electro-galvanizing which is not particularly common for small parts. There are several plating companies in our area that do bright zinc plating; is this a viable alternative to electro-galvanizing. What are the advantages/disadvantages of one vs. the other?

Lee Smeltz
OEM Material Handling Equipment - Lansdale, Pennsylvania


2004

A. I do not believe that there is any difference at all between zinc electroplating and electro-galvanizing, Lee.

My guess is that the term "electrogalvanizing" was invented for obfuscation so that zinc plating could ride the coattails of the heavier and therefore more corrosion resistant hot dip galvanizing :-)

The term seemed to start in the coil/strip industry, where coil processors may tend to call the process electrogalvanizing, whereas most processors of discrete parts call their process zinc electroplating.

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


-- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Is electro galvanised and zinc plated the same thing?
I have a zinc plated chain that I'm installing at a beach. The customer wanted galvanised.

The company that sold me the chain said it was electro-galvanised but the packaging says that the chain is zinc-plated.

Is the chain durable to be installed in a beach environment?

Alan Milich
Installer - SYDNEY N.S.W., Australia


April 19, 2010

A. Hi, Alan. "Zinc plated" and "electrogalvanized" are the same thing. The coating is usually much thinner than hot dip galvanizing and therefore much less corrosion resistant. If I were the buyer I would not accept it on a chain for beach duty. Zinc electroplating will not survive very long on chain at a beach.

Regards,

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



2001

Q. I'm looking for this information: how the layer of zinc (by electrogalvanizing process) will influence the roughness of a steel strip.

Any help would be greatly appreciated. Marc H [last name deleted for privacy by Editor]
- Charlotte, North Carolina


February 12, 2013

A. Hi Marc. Obviously, "it depends". But zinc electroplating will produce a quite smooth finish, so the roughness usually will not increase significantly. On the other hand, it will not "fill in" scratches. So the answer may not quite be "no effect" . . . but that's probably close enough for a first cut estimate in the general case.

Regards,

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



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