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topic 4687

Can iron be chromated?


I study chemical engineering and I'd like to know about chromate conversion coating?

Could someone tell me if it can be used on iron? In literature has been said that it is commonly used on Al, Zn, Cu, Cd etc. How about Fe?

- Finland


Nope, iron cannot be chromated.

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


Thank you!

Is there a simple reason why iron cannot be chromated? What is the big difference between iron and other metals (that can be chromated)? Is it the reaction between metals and chromating solution or what? How is iron different?

- Finland


It's simply that iron does not react with dilute chromic acid and/or it does not generate useful reaction products. Iron phosphate or zinc phosphate are the usual conversion chemicals for iron materials because they do form useful reaction products. The chemistry of both chromate conversion products and phosphate conversion products are highly complex with numerous reactions products formed.

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

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