What comes first... We have a set of shipboard pumps which are in my opinion showing pitting similar to cavitation on the inlet vanes of the impellors. Some camps claim that due to galvanic action or electrolysis has caused this wear by first knocking off the oxide layer then accelerating wear....(indicative of small scalloping marks on the impellors, gray in color) The kicker is in my thinking is if there was galvanic corrosion going on in the system we would see it in many other areas not on the ni al bronze impelors where solely cavitation is expected. Gage lines and small pipe nipples of inferior material would be the first to rot. If have some good photos if anyone cares to view.
Any help would be appreciated
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