Do brass and stainless steel mix?

Assuming both metals are immersed in seawater, brass is one position higher than active 18/8 stainless in the galvanic series in seawater, so the active 18/8 would tend to corrode preferentially. However, passive 18/8 is a good deal higher than brass, and since in most circumstances the majority would be passive, the brass would corrode preferentially.

However, over-riding that is the fact that brass on its own is not great in seawater and any galvanic effect would tend to make a poor situation worse. Most propellers are made from brass with small additions of tin, connected to a stainless steel shaft. Unless an anode is fitted the corrosion rate of the propeller can sometimes be quite rapid.

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