I am doing literature survey about corrosion inhibitors used for Magnesium Alloys, So As Graphene being light weight, atomically thin , inert, wear resistant and strong , that all will be strongest drivers for using graphene as corrosion inhibitors.
So, I need possible suggestion and guidance .
Thanks
Graphene can be used as a corrosion inhibiting coating, however, I am not sure if graphene can be grown directly onto your Mg alloy.
http://pubs.acs.org/doi/abs/10.1021/nn203507y
So, I guess you can grown graphene on a copper sheet and transfer it to your alloy in order to test its corrosion current.
I don't anything about your Mg alloy and its stability at different temperatures and atmospheres. You can also coat graphene oxide onto your Mg alloy and then reduce it at elevated temperatures in inert atmosphere.
Note: I don't have first hand experience in using graphene as a corrosion inhibitor, nonetheless, I work with graphene a lot.
Thanks & regards,
Yarjan
This always seems to me like a slightly crazy idea, as I assume graphene will be cathodic to almost all metals, thereby creating ideal conditions for pitting at defects in the coating (and it should be called a coating, not an inhibitor, as an inhibitor is defined as something that is added in small amounts to the environment ...). It is well known that pyrrolytic carbon films in copper tubes are one of the reasons for pitting of copper water pipes, and I don't see why graphene should be any different (the pyrrolitic carbon could have been graphene for all anyone knows).
Bob
I have used graphene as filler in organic coating. if interested palese see my paper on mg page
Thanks All for great and interesting answers. @tullio Dear can you please send me the exact title of paper so it will be easy for me to search on Google.
Thanks
I think that graphene oxide works better than graphene itself as a protecting coat for your Mg alloy. I guess also that you can use graphene or its oxide as a composite with any surfactant to modify the alloy surface. As such, you need to try the best method for your alloy.
Thanks Robert Alan Cottis for your valuable concern and answer to my question. Yes as graphite will behave cathod as its most noble element, Is graphene will also behave as Cathod to all metals? And you talked about pitting at defects in the coating yes its reason but as Graphene is hardest material , atomically thin and wear resistant so there will be less probability of scratches and defects in coating so still then can we use or not? Thanks
@farikhan Heakal , Thanks for your answer and thats really good idea but are you come across with any of article about graphene oxide as corrosion coating?
Thanks
If you could guarantee to produce total coverage of a metal with graphene and you could guarantee that the coating will not be damaged during use then it is plausible that graphene could provide corrosion protection.
However, metal components will typically be subjected to mechanical impact by spanners, sand particles etc that will produce local plastic deformation that will implicitly rupture any non-reforming coating such graphene. Real components also contain defects such as inclusions, grain boundaries. laps etc that will interfere with most coating processes that produce very thin films.
By all means explore this use of graphene, but make sure you test metals in real situations.
Or, to paraphrase Robert Alan Cottis' reply, there is no such thing as a perfect coating at the macroscopic scale in the real world. You will have defects in your coating and, with grapheme most likely being cathodic to the material you are trying to protect, you will have galvanic corrosion with a huge adverse area effect.
I have incorporated graphene into my sol-gel coating as corrosion inhibitors and I have obtained very good result with improved anti-corrosion performance and adhesion as well. But I have done the electrochemical investigations (Tafel and AC Impedance) with the graphene loaded samples for 360 Hours. Definitely with time, defects will be formed in your film on prolonged reaction with corrosive agent.
The interface strength between graphene and substrate must be very poor, I think.
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