3️⃣Rusting Flashcards
What are ships built from and why?
Ships are built from steel because it is strong and inexpensive
What does rust do to steel?
It peels weakens and makes it flake
What is silica gel used for?
To remove all moisture from air
What is steel made from?
Iron and carbon
Why would a car not rust in the desert?
Because it is so dry and there’s no moisture
What is the equation for rust
Iron ➕oxygen ➕water ➡️ hydrated iron (iii) oxide
How do we prevent rust on ships?
We paint the ships
Why is gold not a good alternative to steel?
It is too expensive
What is stainless steel and why does it not rust?
It doesn’t rest because it has chromium in it
Where can we use aluminium?
Aeroplane
What is copper used for?
Water pipes
Do you get rust if there’s air ➕ water?
Rust
Do you get rust if there’s air ➕ no water?
No rust
Do you get rust if there’s no air ➕ water?
A little rust
Do you get rust if there’s air ➕ water ➕ contact with zinc?
No rust
What is the chemical name for rust?
Hydrated iron (iii) oxide
Two conditions required for rusting
Oxygen and water
Name 4 methods to prevent iron from rusting
Painting/oiling
Plastic coating
Galvanising
Sacrificial protection
How does a plastic coating work?
Prevents air and moisture reaching the iron
What is galvanising?
When iron objects are coated with zinc
Metals that can be used to galvanised iron
Zinc
Chromium
What is the cheapest method of preventing rust?
Painting and oiling
Give an example of when sacrificial protection is used
When attaching zinc bars to a ship
