Similarly, iron or steel should not be installed downstream of copper in a fresh water circuit otherwise rapid corrosion of the iron or steel will occur. A steel pipe attached to a copper tank or cylinder will corrode at a significantly greater rate since the relationship is one of large cathode and small anode. The corrosion of steel tanks commonly connected to copper pipes is reduced by the insertion of electrically insulating washers and also by the relative size of the exposed surfaces, in this case a large anode and a small cathode. With the exception of iron and steel components upstream of copper, when no undue corrosion will be experienced, in pipework carrying fresh water, the jointing of copper to iron or steel should be avoided as far as is possible, otherwise the iron or steel component will corrode preferentially.
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