A piece of magnesium can be attached to the iron hull of a boat to prevent it from rusting.

Why is the magnesium called a sacrificial metal?

How does the Mg keep the iron hull from rusting?

Which can be thought of as the positive cathode, the Mg or the steel hull? Explain.

Putting a block of Mg on a steel boat hull does not create a battery. Why not?

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The technique of protecting metal from accelerated corrosion by connecting it to a different metal that is more easily oxidized, i.e. the sacrificial anode, is called cathodic
protection. It's not necessary to cover the entire surface of the metal to be protected with the second, more easily oxidized metal. All that's required is electrical contact with the second, sacrificial metal. An underground steel pipeline, for example, can be protected by connecting it through an insulated wire to the sacrificial anode. Cathodic protection runs out when the sacrificial anode is completely consumed or the connection between the two dissimilar metals is broken. Which of the four metals below offers cathodic protection to the iron in the steel pipe? (Remember, steel is iron plus a small percentage of carbon.)

a)Zn

b) Ni

c) Al

d) Sn

champagnebee680

The technique of protecting a metal from accelerated corrosion byconnecting it to a
different metal that is more easily oxidized, i.e. the sacrificialanode, is called cathodic
protection. It's not necessary to cover the entire surface of themetal to be protected with
the second, more easily oxidized metal. All that's required iselectrical contact with the
second, sacrificial metal. An underground steel pipeline, forexample, can be protected by
connecting it through an insulated wire to the sacrificial anode.Cathodic protection runs
out when the sacrificial anode is completely consumed or theconnection between the two
dissimilar metals is broken.Which of the four metals below offerscathodic protection to the iron in the steel pipe?
Remember, steel is iron plus a small percentage of carbon.
Answer(s): ___________________________
Metal Choices: Zn Ni Al Sn
Please show your work !!!