Abstract
Corrosion is a naturally occurring phenomenon and there is continuous interest in the development of new and more protective coatings or films that can be employed to prevent or minimise corrosion. In this review the corrosion protection afforded by two-dimensional graphene is described and discussed. Following a short introduction to corrosion, the application of graphene in the formulation of coatings and films is introduced. Initially, reduced graphene oxide (rGO) and metallic like graphene layers are reviewed, highlighting the issues with galvanic corrosion. Then the more successful graphene oxide (GO), functionalised GO and polymer grafted GO-modified coatings are introduced, where the functionalisation and grafting are tailored to optimise dispersion of graphene fillers. This is followed by rGO coupled with zinc rich coatings or conducting polymers, GO combined with sol-gels, layered double hydroxides or metal organic frameworks as protective coatings, where again the dispersion of the graphene sheets becomes important in the design of protective coatings. The role of graphene in the photocathodic protection of metals and alloys is briefly introduced, while graphene-like emerging materials, such as hexagonal boron nitride, h-BN, and graphitic carbon nitride, g-C3N4, are then highlighted.
Highlights
Corrosion is a naturally occurring phenomenon that results in the oxidation of metals or alloys and this is normally accompanied by dissolution of the metal or alloy
The more successful graphene oxide (GO), functionalised GO and polymer grafted GO-modified coatings are introduced, where the functionalisation and grafting are tailored to optimise dispersion of graphene fillers. This is followed by reduced graphene oxide (rGO) coupled with zinc rich coatings or conducting polymers, GO combined with sol-gels, layered double hydroxides or metal organic frameworks as protective coatings, where again the dispersion of the graphene sheets becomes important in the design of protective coatings
It is clear from the reports reviewed and the growing number of publications, where graphene is employed in corrosion protection, that graphene and its derivatives, GO and rGO, are interesting candidates in the formulation of corrosion protective films and coatings
Summary
Corrosion is a naturally occurring phenomenon that results in the oxidation of metals or alloys and this is normally accompanied by dissolution of the metal or alloy. These corrosion corrosion reactions reactions will willpropagate propagatewith withthe the oxidation oxidationreaction, reaction,Equation. Certain metals such as aluminium, titanium and magnesium cannot cannotbebeelectrodeposited electrodepositedfrom fromaqueous aqueoussolutions solutionsasasthe thecompeting competinghydrogen hydrogenion ionreduction reductionreaction reaction isisthermodynamically thermodynamicallyfavoured favouredand andwill willoccur occur ininpreference preference totothe thereduction reduction of of the the metal metal ions This can be achieved in ionic liquids or in conducting organic electrolytes where.
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