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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
finishing.com - Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
2000

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