Anyone good at chemistry and knows a lot of corrosion?

I need some help with a school assignment...
and during the holidays... ==" thought i had some freedom D: lol
but yea... onto the topic, need some help with my assignment, just some background research
i need to know:
1. why does salt water conduct more electricity than regular water?
2. how does the level of conductivity of electricity change the rate of corrosion in iron?
3. what is inside of anti rust paint that makes the paint anti rust and protects the nail?

i would really appreciate it if people would help me >.< i need this done before school starts which is practically after tomorrow lol
and OMG got another assignment for media to do...

 

I think reading this will answer your questions, at least your first two. Your last question is that rust is the oxidisation of iron, it needs water and oxygen to rust, so when it's coated in paint the nail is not exposed to air and so doesn't corrode.

 

Anti-rust paint will generally have an agent that will oxidise instead of the iron. One example is zinc - zinc oxide will then act as a barrier against further corrosion of the iron.

 

ok thank you all very much >.<
man i love romulation very much for this lol

 

Besides paint, another method of reducing corrosion in the real world is, as my chemistry teacher puts it, "anode sacrifice". In places where it's not viable to use anti-rust paint (underground pipes, for example) the iron pipes are connected to another metal acting as an anode aka a reductor. The reductor (magnesium usually) will corrode in place of the iron in the iron pipes.

 

lol that sounds... pro :L
but I'm only doing an experiment for iron nails and i chose to protect with anti rust paint, normal paint and zinc wire cause the teacher said keep it simple lol... would've gone for some other complicated stuff but yea... :L