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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Coating Magnesium

We are trying to protect magnesium prior to painting without much success. We have soaked the part in a chromic acid-sodium nitrate ⇦ this on Amazon [affil link] solution for 5 mins. Then soaked in a sodium dichromate -sodium sulphate sol. for 5 mins. Rinsing between dips. The part developed a heavy smut after the first sol. but no dull golden to dark brown coating after the second solution. Can you offer any assistance on where we may be going wrong?

Frank Dunleavy
aerospace plating shop - Dublin, Ireland
2004

If you could obtain a copy of this specs- AMS2475 (magnesium chemical film treatment) , you may have a good idea on what to do.

Asyong Salungga
Aluminum surface finishing - Toronto
2004

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Ed. note: We also have an FAQ on magnesium finishing on-line here.

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