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Galvanic Corrosion of Black Oxide bolt and Brass Insert

Galvanic Corrosion of Black Oxide bolt and Brass Insert

Galvanic Corrosion of Black Oxide bolt and Brass Insert

(OP)

Hello,
I am trying to determine if galvanic corrosion is a factor between a brass insert and a 3/8 x 1.5" zinc plated steel bolt.  The plate it will be bolted to is painted so it is not a factor.  The anodic index of the brass is 0.4V, and it could be used in machine shops across the U.S.A.. The connection serves as a ground for a computer module also.  
Thanks

RE: Galvanic Corrosion of Black Oxide bolt and Brass Insert

Galvanic corrosion requires the presence of water (conductor) to occur.  

Your combination is used quite often with no problems.  If there is a possibility that you will have moisture to accumulate at the connection a quick fix would be to use a brass fastener.   

One thing to note is that today’s plain zinc plated fasteners vary quite a bite in quality.  If you use zinc I would get a zinc plated fastener with a conversion coat on the zinc.

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