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Differing galvanizing thickness on flat and tubular areas

Q. I am with consultant firm in India, newly added to galvanizing world.i am noticing that galvanizing results on flat surfaces and on tubular parts are different and our product is joined with both flat and tubular part....so the coating thickness varies....is there any solution for the same...

Japneet Singh
Engineer - India
August 24, 2010

A. Sir:

The product with the thicker (likely gray colored) zinc coatings is likely made from reactive steel having a silicon and phosphorus content on the peak of the Sandlin curve.

Regards,

Dr. Thomas H. Cook
Galvanizing Consultant - Hot Springs, South Dakota, USA

A. The thickness of a galvanized coating varies with several factors.
Steel chemistry (likely to be different in different sections of steel)
Immersion time. (varies with size and shape of item)
Zinc temperature (not likely to change much)
Flux chemistry
Zinc bath composition

Of these only really the flux chemistry is controllable by the galvanizer. Have you talked to them about the problem. They are on the spot, they know the job, the item, rather than the sparse info available here.

Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK

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