Anti-corrosion coating composition

A humic acid-based coating suspension comprising humic acid, particles of an anti-corrosive pigment or sacrificial metal, and a binder resin dissolved or dispersed in a liquid medium, wherein said humic acid has a weight fraction from 0.1% to 50% based on the total coating suspension weight excluding the liquid medium, wherein said humic acid comprises chemical functional group selected from a derivative of an azide compound selected from the group consisting of 2-azidoethanol, 3-azidopropan-1-amine, 4-(2-azidoethoxy)-4-oxobutanoic acid, 2-azidoethyl-2-bromo-2-methylpropanoate, chlorocarbonate, azidocarbonate, dichlorocarbene, carbene, aryne, nitrene, (R—)-oxycarbonyl nitrenes, where R=any one of the following groups,

• and combinations thereof.

A humic acid-based coating suspension comprising humic acid, particles of an anti-corrosive pigment or sacrificial metal, and a binder resin dissolved or dispersed in a liquid medium, wherein said humic acid has a weight fraction from 0.1% to 50% based on the total coating suspension weight excluding the liquid medium, wherein said humic acid comprises a chemical functional group selected from OY, NHY, O=C—OY, P=C—NR′Y, O═C—SY, O=C—Y, —CR′1—OY, N′Y or C′Y, and Y is a functional group of a protein, a peptide, an amino acid, an enzyme, an antibody, a nucleotide, an oligonucleotide, an antigen, or an enzyme substrate, enzyme inhibitor or the transition state analog of an enzyme substrate or is selected from R′—OH, R′—NR′2, R′SH, R′CHO, R′CN, R′X, R′N±(R′)3X31, R′SiR′3, R′Si(—OR′—)yR3−y, R′Si(—O—SiR′2—)OR′, R′—R″, R′—N—CO, (C2H4O—)wH, —C3H6O—)wH, (—C2H4O)w—R′, (C3H6O)w—R′, R′, and w is an integer greater than one and less than 200.