
Sorry buddy... but you don't quite understand it. If the Steel is a noble alloy it means very little corrosion of it, and ANY other metal in the loop. .... the very reason why it IS used in pumps. To corrode it has to be an active metal. Mixing an inactive metal (like your hard steel example) is like mixing plastic with water and copper. ie no effect. Your statement of the farther they are apart = more corrosion is not entirely true. They have to be
both active metals.
The electrical conductivity can and will be provided by the water in the absence of anything else. The current that passes through the water to have the effect of corrosion is so small that it will happen.
You should try a Zalman reserator with a copper block and tell me there is no corrosion. (I had one with a copper, low restriction GPU block)... the residue settled down the bottom of the reserator itself.
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