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Originally Posted by |kbn|
My opinion is only really makes any difference if the metals are physically touching - dont know why.. but all of my stuff is fine.. Never used corrosion inhibiters, only d/I water + a biocide.
My d4 pump impeller is perfect - apart from the chip of the annodising that was there when it was new..... and I would assume that impellers would be the first thing to go.. if theres no contact of course..
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The D4 impeller and body is made from passivised 304 stainless steel, which is not galvanically reactive with copper or silver. Passivised 304/316 SS sits about mid-way between copper and silver on the galvanic reactivity scale. It is about as reactive with either silver or copper, as brass is with copper.