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In submerged conditions galvanic corrosion effects exist between metals with dissimilar nobleness and the presence of seawater as electrolyte.

Does reducing the contact area by using an nonconducting paint on the interface layer between the two metal parts help delay this process? Or is any the solid contact electrical route, e.g. via a bolt or so, enough to make the deterioration speed limited by the electrolytic process c.q. the surface area in contact with the electrolyte?

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    $\begingroup$ Your use of c.q. here is unclear; can you edit to use a more universally understood phrase? $\endgroup$
    – Air
    Feb 25 '15 at 21:32
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No solid contact is required at all, as the seawater provides the electrical route. In order to prevent galvanic corrosion, you would need to electrically isolate your two metals. That said, I can see that a solid electrical route would allow faster transfer of electrons, speeding up corrosion, and hence having no solid electrical route would delay corrosion.

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    $\begingroup$ Ok tnx! so no solid contact at al! I found this definition "electrochemical action of two dissimilar metals in the presence of an electrolyte and an electron conductive path" Apparently is the seawater at $\approx 0.2\,[\Omega/m]$ both electrolyte and path. $\endgroup$
    – Walter
    Feb 25 '15 at 14:22

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