Galvanisation is a method of protecting steel and iron from rustingby coating them with a thin layer of zinc. The galvanised article isprotected against rusting even if the zinc coating is broken. Can youreason this out?

Sure, I can explain this. Galvanisation protects steel and iron from rusting due to the properties of zinc and the electrochemical process that occurs. Here are the steps to understand this:

1. Zinc is more reactive than iron and steel. This means that it will oxidize (rust) before the iron or steel does.

2. When the zinc coating is applied to the iron or steel, it acts as a protective barrier. Even if this barrier is broken or scratched, the zinc will still corrode first because of its higher reactivity.

3. This process is known as "sacrificial protection" because the zinc sacrifices itself to protect the iron or steel. The zinc corrodes (or rusts) in place of the iron or steel.

4. This sacrificial protection continues even if the zinc layer is damaged. As long as there is some zinc present, it will continue to corrode before the iron or steel does.

5. Therefore, even if the zinc coating is broken, the underlying iron or steel is protected from rusting. This is why galvanised articles are protected against rusting even if the zinc coating is broken.