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Chromate Based Coatings

I am a first year university student I am doing a project on chromate based coatings for aircraft exterior, and in this project I have to say why non-chromate coatings are inferior. I have researched libraries and the internet, and have found very little. Here is my question; exactly why are non-chromate based coatings inferior to their chromate based counterparts. What exactly makes them inferior. Any information would be greatly appreciated.

Thanks.

Jesse [last name deleted for privacy by Editor]
University of Toronto - Toronto, Ontario
2000

The most favorable aspects of chromate coatings are that the chromate itself is an effective corrosion inhibitor, the chromate coating is a self-healing gel film, and chromating is easy to do right whereas the substitutes are more finicky.

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
2000

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