Cathodic protection of iron involves using another more reactive metal as a sacrificial anode. Classify each of the following metals by whether they would or would not act as a sacrificial anode to iron.

Drag each item to the appropriate bin.

View Available Hint(s)

Reset
Help
Ag
Mg
Cu
Pb
Sn
Zn
Au

a. Will act as sacrificial anode for iron
b. Will not act as sacrificial anode for iron

Explanation:

Materials used for sacrificial anodes must be relatively pure active metals.

Or we can say any metal with more negative potential that that of iron ( +0.59) is used for sacrificial anode for iron

so from the above the following can be used as sacrificial anode for iron

Mg = +1.06

Al = +0.96

Zn = +0.7

The following will not be used as sacrificial anode for iron because their negative reduction potential is less than that of iron ( +0.59)

Ag = -0.76

Cu = -0.44

Pb = 0

Sn = +0.34

Au = -3.05

it is a solid

explanation: