This water heater found in a MI home had no dielectric unions. The severe corrosion has
resulted from the contact between galvanized pipe and copper flex connectors.
"Galvanic" corrosion occurs between any two dissimilar metals in contact with each
other and water. Galvanic corrosion is, in fact, defined as an electrochemical
reaction of two dissimilar metals in the
presence of an electrolyte, typically water, and where a conductive path exists.
This very small current flow
causes the corrosion of the least corrosion-resistant (active) metal to increase
and corrosion of the more
corrosion-resistant (inactive) metal to decrease. Since current flow and dissimilar
metals are involved, this
form of corrosion is called galvanic, or two-metal corrosion. Corrosion progressively
destroys the metal, causing weakness, which can lead to failure. One of the more effective methods of
controlling corrosion is preventive, such as using
It's obvious this water heater was leaking before it
was winterized, a replacement tank is needed.
Photo provided by Randy Aldering
Housesmithe Home Inspection
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