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Ted Mooney, P.E. RET
Pine Beach, NJ

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Magnesium Mated to Printed Circuit Board

I am designing an electronic enclosure which is to be made of thixomolded magnesium AZ91D. We will be fastening a PCB with exposed soldered (tin/lead) surfaces directly to the magnesium for electrical conductivity. The electronic enclosures are rated for use in indoor environments only (-10° to +50°C, 90% Relative humidity, non-condensing). What surface treatment for the magnesium do you recommend?

Erik Tews
mechanical engineer - Fresno, California, USA
2004

When electrical conductivity is necessary, the choices are quite limited, with electroless nickel plating being the most common. You will need to work with your molding/casting supplier to insure that the surface of the parts is adequate for the electroless nickel process.

Toby Padfield
Automotive module supplier - Michigan
2004

Do not make electroless nickel, it will accelerate galvanic corrosion. Ask Oakite (Chemetall) about OXSILAN MG 0611.

Ilya Ostrovsky
Surface Treatment - Germany/Israel
2004

adv.
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