Galvanic Corrosion

Galvanic corrosion occurs with the presence of two dissimilar metals in a conductive medium.  For example, mixed copper and iron pipes in the presence of tap water will cause this form of corrosion to occur. 

The main method of treating this type of corrosion is by installing a plastic plug or by continuously adding a corrosion inhibitor.  In some cases, a sacrificial metal can be installed.