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Metal finishing Q&As since 1989

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Olive green passivation as substitute to yellow passivation

Why is olive green passivation over Zinc plating on MS not widely used as Yellow passivation over Zinc plating? Is it because of any technical reason or purely commercial reason?

Cowkur Giri Suresh
- Chennai, TamilNadu, India
2002

It's a bit more expensive, and perhaps not as aesthetically pleasing.

What's green and contains hexavalent chromium? A dinosaur.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

Because it is an ugly color to most people. It has superior corrosion resistance to yellow because it is a thicker film.

James Watts
- Navarre, Florida

Both. The olive drab finish provides more corrosion protection but is more costly. It is frequently used for military hardware and as an undercoat for paint.

Gene Packman
process supplier - Great Neck, New York

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