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Originally Posted by Icelander
What about polymer or composites?
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if you can chemically and electrically isolate the iron from the environment, this should work. The main issue is that if you have any hole in the coating you can get an electrical connection and the iron can start donating electrons to other things. This leads to corrosion, which is generally considered bad. The main solution is to pair the iron up with something that is even more happy to donate electrons than the iron is, as a sacrificial electrode. Hence, zinc.
I'm not really sure how the graphene gets around this, just that some laboratory results showed increased corrosion resistance.
Luke