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Posted by Matt Wilson [71.170.81.50] on Sunday, February 12, 2012 at 13:21:40 :
In Reply to: Water Distribution Tube (again) posted by gmharris [71.105.36.40] on Sunday, February 12, 2012 at 02:11:59 :
According to one website I just looked at (http://www.engineersedge.com/galvanic_capatability.htm), brass and cast iron are far enough apart on the galvanic chart to cause problems in the presence of moisture, but I'm not a chemist or corrosion engineer, so I can't comment any more on it. I do seem to recall having brass parts in cooling systems over the years, and not seeing much corrosion, though.
I had an engineering professor who owned many classic cars and hot rods, and he recommended the use of distilled water to prevent corrosion in cooling systems. He said the minerals in ordinary water are what allow water to conduct electricity and therefore cause galvanic corrosion. So if you remove the minerals, meaning if you use distilled water, then this will not be a problem, and radiators and other cooling system metals normally attacked by corrosion will last a really long time. I guess deionized water would also work. In this scenario, I suppose this would make it safer to use brass in cast iron.
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