> most stainless steel is nonreactive in itself and doesn't rely on an oxide coating correct, except the chromium reacts with oxygen to create a protective "skin." this is susceptible, in a maritime environment to galvanic corrosion, two dissimilar metals corroding due to presence of electrolyte (salt water) and electron flow which you have in a ship. also, stress corrosion is a thing.  > which is why they use it in the piping in chemical plants.  a much less harsh environment where metallic and electric contact can be controlled. you gotta paint your ship. there is no way around it.
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