Letter 25022

Protection for magnesium

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I am using a chromic acid conversion coating to protect magnesium, only to find that when coated the coating soon breaks dowm .What should this chromating solution consist off , and what are the optimum conditions for use

Alan Goodridge
paint manufacturer - Birmingham, England, UK

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See the Mg finishing FAQ on this site.

Toby Padfield
automotive module supplier - Michigan, USA

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The Magnesium FAQ is really out of date. Alan, why do not you try a modern pre-treatments?

Ilya Ostrovsky
Oakite Chemetall

Germany/Israel

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You are right, Ilya, and there is a quick addendum reflecting that fact at Update on Magnesium Treatments. People should contact their suppliers for information about these new processes.

If you can help update our FAQ in a non-commercial fashion, we would be very pleased to add your addendum. But most of these new treatments are proprietary, and trying to mix together sales literature with peer-reviewed published technical articles might make an unpalatable salad :-)

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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