c6.1.12 reducing corrosion Flashcards
1
Q
physical barriers
A
painting
coating with oil/ grease/ plastic
2
Q
chemical protection
A
sacrificial protection
metal plating
3
Q
sacrificial protection
A
Putting something like a metal that is MORE REACTIVE than iron (ex. magnesium and zinc)
These will corrode first
4
Q
galvanising
A
covering with a layer of molten zinc
acts a physical barrier and then sacrificial metal
5
Q
tin plating
A
covering with a layer of tin
tin is less reactive than iron
but if the tin is scratched off, then the steel acts as a sacrificial metal, but it rusts even faster