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Chromate conversion (alodine 1200)

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For corrosion protection of an aluminium part of a helicopter our customer is requesting chromate conversion of aluminium alloys using Alodine 1200.

I would like to have a detailed description of this process since we are not familiar with it.

I would also like to know if there is any restriction to use this process due to its carcinogenic potential.

Thanks for your time.

Patrik Ugarte
- Las Arenas, SPAIN

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The product you named is the proprietary name for an aluminum chromate conversion coating that meets USA MIL C 5541f, yes it is carcinogenic, and the rinse water effluent has to be treated and the sludge dumped in an "approved" waste dump.Alternate finishes are in demand but so far nothing approaches the protection offered by aluminum chromate. Europe (EU) has almost completely banned any chromate conversion coatings. Several other proprietary products are readily availbale across the globe.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

Editor's note:
   Mr. Probert is the
   author of

Aluminum How-To / Aluminio El Como

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