(a) From the galvanic series (Table 17.2), cite three metals/alloys that may be used to ga...

(a) From the galvanic series (Table 17.2), cite three metals/alloys that may be used to galvanically protect cast iron.

(b) As Concept Check 17.4(b) notes, galvanic corrosion is prevented by making an electrical contact between the two metals in the couple and a third metal that is anodic to the other two. Using the galvanic series, name one metal that could be used to protect a nickel-steel galvanic couple.

Table 17.2 The Galvanic Series

Source: M. G. Fontana, Corrosion Engineering, 3rd edition. Copyright 1986 by McGraw-Hill Book Company. Reprinted with permission.

Concept Check 17.4

(b) Sometimes galvanic corrosion is prevented by making an electrical contact between both metals in the couple and a third metal that is anodic to these other two. Using the galvanic series, name one metal that could be used to protect a copper–aluminum galvanic couple.