Corrosion?

[vexx]

Hi,

We have to know these two following points for the exam, however we have not done any corrosion in class/missed two classes due to my 3/4.

* Describe the significance of corrosion of iron in social and economic terms
* Explain the chemistry involved in the corrosion of iron and the subsequent formation of rust including the electrochemical nature of the process.

Any help will be much appreciated.

Thanks,

Vexx.

[vexx]

Anyone?

[VeryCrazyEdu.]

welll for the first point- in economic terms it can cause a lot of damage. If not properly protected against through paint, alloys or placement with a more reactive metal rust can cause entire structures to be replaced, costing a lot of course.

For the second point, im fairly certain but dont take my work for it that the equation I learnt for it was the combined redox equation of the oxidation and reduction of iron with water and oxygen.

Thats all i got...lol my exam is tomorrow... :S

[vexx]

thanks for that though:)
perhaps someone else can be a bit more specific with the second part?
goodluck for exam!

[Potter]

Corrosion of iron..Hmmmm..

I think it's something like this..

Fe ---> Fe2+ + 2e- - oxidation#1
Fe2+ ---> Fe3 + e- - oxidation#2
2H2O + O2 + 4e- --> 4OH- - Reduction.

Oxidation #1 and Reduction combined eq -

Fe + 2H2O + O2 --->  Fe(OH)2

4Fe(OH)2 + 2H2O + O2 ---> 4Fe(OH)3

And magically somehow Fe(OH)3 becomes..

Fe2O3.xH2O

Btw, are you planning to do muep chem at scotch college?

[vexx]

thanks for that, i sort of get it but still a but fuzzy but my teacher said she'd go over it tomorrow

hmmm, i'm unsure, most likely scotch though just the time isn't so good. you doing it next year?

[Potter]

Yeah, at scotch college too. The time is a bit of a bitch.. I think I'll just be able to make it on time..

[vexx]

Yeah, at scotch college too. The time is a bit of a bitch.. I think I'll just be able to make it on time..

hmm hopefully it works out, otherwise i'll have to deal with monash each week >_>

[kenhung123]

How far do you live from scotch?

[vexx]

^ me? i live about 15min'ish. are you thinking of scotch enhancement too?

[kenhung123]

My teacher recommended Scotch seminars...not sure though

[vexx]

scotch seminars o_o?