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Galvanic corrosion of masked articles

Is it possible for galvanic corrosion to take place between dissimilar metals in the same electrolyte when they are covered with a masking medium such as wax?

Tony Hopson
- Sterling, Virginia, USA
2001

2001

Assuming the wax to be impervious, it should not be possible. My understanding is that for galvanic corrosion you need:

a difference in potential (which you have because the metals are different),
an electron path between the two metals (which you would have if the two metals are connected with a wire, or are touching each other, or if one is a coating on the other)
an ionic path (which you don't have if the solution cannot reach one or both of the metals)

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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