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topic 18119

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

First of three simultaneous responses -- ++

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

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

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey
Striving to live "Aloha"

Second of three simultaneous responses -- ++

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

Third of three simultaneous responses -- ++

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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