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Google “Galvanic Series”. Ever wonder why stainless steel screws are so hard to get out of our aluminum outboards? It is because aluminum and SS are so far apart on the chart. It is the aluminum that corrodes in the presence of SS and forms that white powdery stuff that locks them together.. It may come as a shock to see that aluminum / steel are pretty close together and less vulnerable to galvanic corrosion.
All I can add is this . When aluminum siding was the rage , it was not to be installed with galvanized nails. If you did, within a few years the area where the nail contacted the siding would dissolve away and the siding would fall off. I was told it was called galvantic action that caused it. I use steel bolts I figure if its good enough for the bolts in the outboard motor ,should be good for the boat also. Just my 2 cents
Speaking of bolts! OMC bolts are some kind of alloy of stainless and steel. I went to my local recycle place a while ago. Had some stainless steel separate from other scrap metal. The yard worker whipped out his magnet and said “nope same as steel”. He gave me a line that if a magnet sticks to a metal it is not stainless. John/Evin/Gale all use good bolts that don’t seam to rust but a magnet does stick to them. Thought you might like to know that!
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Suppose you could Google “Metals Nobility Chart”. Yes, galvanic corrosion is always a concern within a corrosion cell. Brass might also be a material to try.
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