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Galvanic corrosion

thread338-42262

Galvanic corrosion

Galvanic corrosion

(OP)
I'm trying to solve a corrosion problem.  I have a zinc plated cold rolled steel cabinet (zinc plated IAW ASTM b633, type 2 - yellow chromate over the zinc).  I have an EMI mesh gasket in contact with the zinc/chromate surface.  The mesh in contact is tin-plated.  Any ideas on a solution to avoid this corrosion?  Considering a monel mesh gasket in contact with this surface.
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RE: Galvanic corrosion

Maybe have your mesh zinc plated & chromated.

Don't understand why monel is considered,
the galvanic series in my materials science testbook
shows tin halfway between monel & zinc.
(I don't have my corrosion handbook with me, does chromating makes zinc passive enough to match monel?)

RE: Galvanic corrosion

In a similar situation, the principle suggested, using the same plating on both parts, was followed.  
However, it was decided to tin plate the steel rather than zinc plate the EMI mesh.
http://www.finishing.com/192/66.html

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