Corrosion poses a serious threat to many areas of the electrical industry. Galvanic corrosion occurs where two dissimilar metals are joined together.
The most common examples of galvanic corrosion are aluminum alloys that are joined to steel or copper and exposed to a wet saline environment. Corrosion will only start after the contact area is exposed to an aqueous liquid in order to insure ionic conduction.
Once galvanic corrosion starts, it cannot be stopped. The only option after corrosion has started is replacement.