Application of Electrochemistry

One application we study about electrochemistry is protect iron from corrosion. We know that iron is widely used as housewares such as spoon, fence, etc. our motor also contains of iron. The weakness of iron is very easy to be corrosion. There are many way to protect iron from corrosion:
1. Mechanical Protected
We can protect iron by painting the iron, this the classic way. The another way is by using electroplating, coating process of iron with another metal. Note the coater metal is metal that have reduction potential less than reduction potential of iron, for example zinc. Why????because if the exfoliate zinc will be oxidation an will become anode and then iron will be reduced and become cathode. and the mini Galvani is not progress and corrosion is stopped.
the reaction is:

2. Cathode Protection
This process using the metal that have reduction potential greater than iron such as. This method is widely used as protection of tower or water pipe. To protect tower or water pipe usually use magnesium that connected with wire. magnesium will be oxidation and iron will be reduction the reaction is: