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What problems are caused by connecting copper pipe/tubing directly to galvanized steel pipe?
Wednesday, December 5, 2018
When two different metals that are distant from each other on the Galvanic Scale are connected directly to each other, an electrolytic reaction called galvanic corrosion consumes the metal that is lower on the scale. Since steel is below copper on the scale, a cancerous-looking lump forms on the galvanized steel over time, which eventually starts to leak. The photo above is an example of advanced galvanic corrosion at a water heater. To learn more about the Galvanic Scale and find out what to do to avoid galvanic corrosion, see our blog post What's that powdery crust on the pipe connections at the water heater? Also, for a solution to this problem, go to our article Should I use a dielectric union or brass nipple to connect copper tubing and galvanized steel pipe?
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