by Ron Joseph
Difference between Zinc Plate, Zinc Chromate and Dichromate
Q. Would you please let me know the difference between the following three
surface finishing processes? Zinc plated, Zinc chromate, Dichromate Thanks very
A. Zinc plating is an inorganic metal coating that is deposited on a steel
using an external electric current. It is similar to galvanizing.
Zinc chromate is usually an organic primer paint that can be spray or brush
applied over steel, galvanizing or even zinc plating.
Dichromate is a sealer that is deposited on an inorganic plating, such as zinc
plating. It is very thin and in itself does not provide much corrosion resistance.
However, when it is deposited onto a metal, such as zinc plating, it enhances
the corrosion resistance and is an excellent base of a paint that can be applied
over the plating.
Hope this helps.