![]() If corrosion is present on both hot- and cold-water pipes, have your house water evaluated by a water-testing laboratory.Be sure to change the water heater’s anode rods every three to five years. It does not affect the cooking experience or performance of the cookware and should be considered an aesthetic preference only. Iron deposits from a rusty water heater can also corrode copper pipes.The excess flux gets carried through the pipe and deposited along the way, pitting the interior. There are two known types of copper corrosion, which are uniform. After a few years, this tarnish gradually changes to dark brown or black, and finally to green. When exposed to the atmosphere, copper oxidizes, causing normally bright copper surfaces to tarnish. On cold-water piping, pitting and corrosion is often caused by an excess amount of flux residue. Copper corrosion is the corrosion of materials made of copper or copper alloys.Once mixed, apply to the copper surface and buff in a. If the pipe ends weren’t properly reamed smooth prior to soldering, the raised burrs inside the pipe can cause local turbulence, called erosion corrosion, which will corrode the pipe. A simple homemade copper cleaner to banish tarnish can be made by combining lemon juice with baking soda and stirring until mixed completely.Water moving through a pipe at unusually high velocity can wear away copper from the interior of the pipe.Stagnant water allowed to sit in horizontal lengths of piping for extended periods can corrode the inside of copper pipe.In this video, This Old House plumbing and heating expert Richard Trethewey explains causes and cures for water-pipe corrosion. ![]()
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