It is more resistant to corrosion.
When a galvanised iron piece is scratched and the underlying metal is exposed, it is less likely to rust because the zinc coating provides cathodic protection to the iron beneath it. In contrast, a tinned iron piece, which is coated with tin, does not offer the same level of protection, and the exposed iron is more prone to rusting. Tin can corrode and does not protect the underlying iron as effectively as zinc does. Therefore, the galvanised iron piece has a better chance of preventing rust when scratched.
oxidation
Galvanised = metal (iron, steels) protected with a layer of zinc Alkanized = water or a solution with a pH greater than 7
galvanised
Iron has to be exposed to oxygen for oxidation to occur.
Corrugated Galvanised Iron
1,642 lbs
Coating iron with zinc through galvanization creates a protective layer that acts as a barrier against corrosion. The zinc layer sacrifices itself to protect the underlying iron, as zinc corrodes preferentially over iron. This process helps prevent rusting and extends the lifespan of the iron material.
Aluminium corrugated sheets are generally stronger than galvanised iron corrugated sheets because of the inherent strength of aluminium as a metal compared to iron. Aluminium is also more resistant to corrosion, making it a more durable option for outdoor applications.
I think what you are reffering to is iron oxide which is commonly known as rust
Yes, iron rusts when exposed to the elements outside due to a chemical reaction with oxygen and water.
It causes a chemical reaction and black smoke appears then there is a slight explosion in the air. Beware and stay safe when this occurs.