Copper / Galvanized ... Electrolosis

Electrolysis is an often misused term when applied to copper plumbing tubing. True electrolysis, or electrolytic corrosion, as it is more properly designated with regard to piping, is caused by an imposed (external) stray DC current and happens when 2 or more different metals touch IE., copper and steel plumbing components. In many cases, it is also thought that grounding of a building’s electrical system to the copper piping can cause this phenomenon, but there is no statistical data to support this, nor is it recommended that the piping system be used as the main electrical ground for a building or dwelling.

Usually, what people are really referring to when they say electrolysis is galvanic or dissimilar metal corrosion. Galvanic corrosion is caused by self-induced current created by electrical potential of two dissimilar metals in contact with an electrolyte. It can occur when two dissimilar metals (such as copper tube and steel pipe) are connected in the presence of an electrolyte.

Stainless steel , Brass and Copper, all common metal piping materials and how they react to each other, it is rarely the copper tube that fails because of galvanic corrosion. Black steel and Galvanized steel when connected to the other metals above , will start an eating away by corrosion until sooner than later a leak in your plumbing pipes will occur. Do it right the first time!