No 1: Not many things can come close ??? Steel with mill scale (black steel) Cast iron Lead High silicon cast iron Aluminum and alloys Graphite Zinc (galvanized steel) Copper and alloys Magnesium No 2: Can endure a lot of use and abuse ??? Steel with mill scale (black steel) Cast iron Lead High silicon cast iron Aluminum and alloys Graphite Zinc (galvanized steel) Copper and alloys Magnesium No 3: That scale is in fact protective ??? Steel with mill scale (black steel) Cast iron Lead High silicon cast iron Aluminum and alloys Graphite Zinc (galvanized steel) Copper and alloys Magnesium No 4: An excellent choice ??? Steel with mill scale (black steel) Cast iron Lead High silicon cast iron Aluminum and alloys Graphite Zinc (galvanized steel) Copper and alloys Magnesium No 5: A long history and many stories to tell ??? Steel with mill scale (black steel) Cast iron Lead High silicon cast iron Aluminum and alloys Graphite Zinc (galvanized steel) Copper and alloys Magnesium No 6: Much used, but watch out! ??? Steel with mill scale (black steel) Cast iron Lead High silicon cast iron Aluminum and alloys Graphite Zinc (galvanized steel) Copper and alloys Magnesium No 7: Can't stand it ??? Steel with mill scale (black steel) Cast iron Lead High silicon cast iron Aluminum and alloys Graphite Zinc (galvanized steel) Copper and alloys Magnesium No 8: Sacrifice itself readily ??? Steel with mill scale (black steel) Cast iron Lead High silicon cast iron Aluminum and alloys Graphite Zinc (galvanized steel) Copper and alloys Magnesium No 9: Makes a perfect anode ??? Steel with mill scale (black steel) Cast iron Lead High silicon cast iron Aluminum and alloys Graphite Zinc (galvanized steel) Copper and alloys Magnesium 
