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topic 9433

Gel Passivation


We are process vessel manufacturers and have been asked to "gel passivate" the external surfaces of a small vessel. What is gel passivation?

August Cook
- Syracuse, New York


They are most likely referring to a hexavalent chrome conversion coating that is used to passivate zinc or zinc-alloy platings. This conversion coating is only angstroms thick, but it is a hydroscopic gel. This type of passivate is part of all typical zinc or zinc-alloy platings.

tim neveau
Tim Neveau
Rochester Hills, Michigan


Mr. Cook:

There are gelled products on the market for "painting" onto the surface of stainless steel where immersing in a tank is not possible. We market safe and environmentally friendly products based on citric acid to do this, if you need help. These products produce a surface which does not have free iron or other exongenous materials on them, and improves corrosion resistance dramatically, especially in the weld areas.


lee kremer
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Lee Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
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