Which metal object may be least affected by galvanic corrosion when submerged in saltwater?

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When metals are in saltwater and electrically connected, galvanic corrosion happens: the more anodic metal tends to corrode faster while the more cathodic metal is protected. The metal that will be least affected is the one that is inherently highly resistant to corrosion in chloride environments.

Stainless steel propeller shafts are protected by a stable chromium oxide layer, which gives them excellent resistance to corrosion in seawater. Even if they are in electrical contact with other metals, this passive film helps keep the stainless steel from corroding as quickly as the other materials listed. The other options are more prone to galvanic attack in saltwater: aluminum is very anodic and corrodes readily in seawater; bronze can suffer corrosion influenced by galvanic pairing with steel or stainless steel; lead, while relatively resistant in some respects, can still be affected by galvanic interactions and environmental factors.

So, the stainless steel propeller shaft is the best choice for the least galvanic corrosion risk in saltwater.