A zinc coat
Galvanisation.
A scratch in the coating
An iron bar has a thin layer of zinc on it. The layer gets a scratch, and a bit of iron shows.
Will the iron rust?
What this lesson covers
The idea
Galvanisation protects steel and iron from rusting by coating them with a thin layer of zinc; the galvanised article stays protected even if the zinc coating is broken.
A scratch in the coating
An iron bar has a thin layer of zinc on it. The layer gets a scratch, and a bit of iron shows.
Will the iron rust?
- It stays protected
- It rusts quickly at once
- The zinc layer peels away fully
Coat with zinc
Press Next step.
Zinc protects
Galvanisation coats iron or steel with a thin layer of zinc. This prevents rusting. The article stays protected even if the zinc coating is broken.
Galvanisation protects steel and iron from rusting by coating them with a thin layer of zinc; the galvanised article stays protected even if the zinc coating is broken.
Notes
Galvanisation coats iron or steel with zinc; the article is protected even if the coating is broken.
Check yourself
Galvanisation coats iron or steel with a thin layer of ...
The aim of galvanisation is to ...
A galvanised article has a broken zinc coating. It is ...
- copper. The book names zinc for galvanisation.
- silver. The book names zinc for galvanisation.
- zinc — correct. Yes!
- protect iron and steel from rusting — correct. Yes!
- make iron more reactive with oxygen. The aim is to protect iron and steel from rusting.
- make a thick oxide layer on aluminium. That is anodising, not galvanisation.
- no longer protected. The book says it is protected even if the coating is broken.
- still protected against rusting — correct. Yes!
- protected only at the unbroken parts. The book says the galvanised article is protected even if the zinc coating is broken.