Question

If the zinc metal is scratched of from iron , iron still does not rust . It is suppose to cause now its in direct contact with moist air .

Answer 1

Corrosion is usually defined as the degradation of metals due to an electrochemical process. The formation of rust on iron, tarnish on silver, and the blue-green patina that develops on copper are all examples of corrosion. The total cost of corrosion in the United States is significant, with estimates in excess of half a trillion dollars a year.

Answer 2

Answer:

Even when zinc layer scartched from the iron ,it protects iron from getting oxidized because it is more reactive than iron so zinc gets oxidized and thus protects iron from getting rust.