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What is galvanic corrosion?



Galvanic or dissimilar metal corrosion is the corrosion that takes place when different metals or alloys are coupled together in the presence of an electrolyte. The position of the dissimilar metals in the galvanic series, the conductivity of the electrolyte and the ratio of the surface areas of the dissimilar metals are factors which affect the severity of the corrosion.

Aluminium and copper are a long way apart in the galvanic series and using them together in a marine environment is not good practice.