The redox potentials for Aluminum are: -1.662 VThe redox potentials for Cast Iron are: -.440 VCan someone tell me how to show mathematically as well as analytically the answer? RELATED: How do you tell from redox potentials which metal is expected to dissolve if lets say Cu: .340V and Al: is -2.33V.My answer was Al due to it being a better anode and thus giving off more electrons.is that true and if not please help with both of these questions?
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Both Al and cast iron will corrodeIn fact, the general rule is that the metal with a more negative standard reduction potential will oxidize first and therefore corrode fasterTherefore, aluminum has a greater tendency to oxidize than does ironHowever, this does not occur, since a layer of insoluble aluminum oxide that forms on the surface of aluminum serves to protect the aluminum underneath from further corrosionWhile, the rust that forms on iron is too porous to protect the underlying metalThe method to determine which metal will corrode; say copper or aluminum is to consult a table of standard reduction potentials found in most chemistry booksAnd whichever metal is higher up on the list(i.ehas a more positive SRP) will corrode less (lose electrons: become oxidized) and the other metal lower on the list(less positive) will lose electrons(become oxidized)Therefore, Al corrodes first.
