<Tr> <Td> Carbon, Graphite, Coke </Td> <Td> + 0.3 </Td> </Tr> <Tr> <Td> Platinum </Td> <Td> 0 to − 0.1 </Td> </Tr> <Tr> <Td> Mill scale on Steel </Td> <Td> − 0.2 </Td> </Tr> <Tr> <Td> High Silicon Cast Iron </Td> <Td> − 0.2 </Td> </Tr>

E. name two metals that would provide the iron storage tank with cathodic protection. (4 points)