exact answers only
Lets look from a different angle corrosion is basically oxidation and in oxidation the electrons are lost.
Here we have zinc coated on iron being more reactive the zinc will tend to loose the electrons even if the iron is exposed, even then being good conductor the electrons are given to the iron by the zinc. So actually the lost electrons are from the zinc , not the iron. Thats how Zinc protects iron even if the coation of zinc is removed from some places.
I am M.Sc (chemistry ) from Punjabi University Patiala. I am a science teacher with expertise in chemistry, with 8 years of experience in teaching. Writing and blogging is my hobby, I write whenever I am free. I am constantly working on creating a new and easy way of learning the tough things in an effective way. I am constantly working to make authentic and reliable information to be shared with my students and widen the horizons of knowledge. View more posts
The Unconditional Guru