Anti-corrosion coating composition

A method of inhibiting corrosion of a structure or object having a surface, said method comprising covering at least a portion of the surface with an anti-corrosive coating comprising 0.1% to 50% by weight of humic acid, wherein said anti-corrosive coating contains an anti-corrosive pigment or sacrificial metal selected from the group consisting of aluminum, chromium, zinc, beryllium, magnesium, an alloy thereof, zinc phosphate, and combinations thereof.

A method of inhibiting corrosion of a structure or object having a surface, said method comprising covering at least a portion of the surface with an anti-corrosive coating comprising 0.1% to 50% by weight of humic acid, wherein said anti-corrosive coating further comprises from 0.01% to 30% by weight of single-layer or few-layer graphene sheets selected from a pristine graphene material having essentially zero % of non-carbon elements, or a non-pristine graphene material having 0.001% to 47% by weight of non-carbon elements wherein said non-pristine graphene is selected from the group consisting of graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, doped graphene, chemically functionalized graphene, and combinations thereof.