Anti-corrosion composition, characterised in that it comprises: a) at least one organic binding resin selected from alkyd resins, modified alkyd resins such as urethane modified alkyd resins or epoxy modified alkyd resins, terpene resins, acrylic resins such as styrene-acrylic resins, hydrocarbon resins, and vinyl resins such as vinyl acrylic resins and vinyl styrene resins; preferably, the binding resin is selected from urethane modified alkyd resins, also called urethane alkyd resins; b) at least one organic corrosion-inhibiting agent that is a compound comprising at least one thiol function and/or at least one thione function selected from 2-mercaptobenzothiazole or 2-MBT, also called benzothiazole-2-thiol or 2 -benzothazolethione, 6-methyl-2-mercaptobenzothiazole, naphthol[1,2-d]thiazole-2 -thione, 7-methyl-benzothiazole-2-thiol, 4-methyl-2 -benzothiazolethione, 6-ethyl-2-benzothiazolinethione, 2,5-dimercapto-1,3,4-thiadiazole or DMTD, mercaptobenzimidazole, and the salts thereof, such as for example the metals or amine salts thereof; preferably the organic corrosion-inhibiting agent is selected from the sodium salt (1/1) of benzothiazolethione, the zinc salt (2:1) of benzothiazolethione, and the cyclohexylamine salt of 2-mercaptobenzothiazole; c) optionally a solvent; and d) at least one solid inorganic corrosion-inhibiting agent selected from the metal oxides such as zinc, cerium, titanium, iron zirconium, praseodymium and antimony oxides; metalloid oxides; zinc calcium strontium aluminium orthophosphosilicate hydrate; synthetic amorphous silica exchanged by calcium ions; strontium aluminium polyphosphate hydrate; barium sulfate; zinc 5-nitroisophthalate; calcium strontium phosphosilicate rendered organophilic; zinc phosphate in particular rendered organophilic; zinc molybdate in particular rendered organophilic; modified aluminium polyphosphate; strontium titanate; antimony tin oxide; and molybdenum; said solid inorganic corrosion-inhibiting agent having a nanometric particle size, on the understanding that nanometric particle size means that the mean size, for example the mean diameter (d 50), of the nanometric particles is from 1 to 100 nm, preferably from 5 to 50 nm, more preferably from 10 to 50 nm, better from 10 to 20 nm, the size of the particles being measured by TEM (transmission electron microscopy). a) at least one organic binding resin selected from alkyd resins, modified alkyd resins such as urethane modified alkyd resins or epoxy modified alkyd resins, terpene resins, acrylic resins such as styrene-acrylic resins, hydrocarbon resins, and vinyl resins such as vinyl acrylic resins and vinyl styrene resins; preferably, the binding resin is selected from urethane modified alkyd resins, also called urethane alkyd resins; b) at least one organic corrosion-inhibiting agent that is a compound comprising at least one thiol function and/or at least one thione function selected from 2-mercaptobenzothiazole or 2-MBT, also called benzothiazole-2-thiol or 2 -benzothazolethione, 6-methyl-2-mercaptobenzothiazole, naphthol[1,2-d]thiazole-2 -thione, 7-methyl-benzothiazole-2-thiol, 4-methyl-2 -benzothiazolethione, 6-ethyl-2-benzothiazolinethione, 2,5-dimercapto-1,3,4-thiadiazole or DMTD, mercaptobenzimidazole, and the salts thereof, such as for example the metals or amine salts thereof; preferably the organic corrosion-inhibiting agent is selected from the sodium salt (1/1) of benzothiazolethione, the zinc salt (2:1) of benzothiazolethione, and the cyclohexylamine salt of 2-mercaptobenzothiazole; c) optionally a solvent; and d) at least one solid inorganic corrosion-inhibiting agent selected from the metal oxides such as zinc, cerium, titanium, iron zirconium, praseodymium and antimony oxides; metalloid oxides; zinc calcium strontium aluminium orthophosphosilicate hydrate; synthetic amorphous silica exchanged by calcium ions; strontium aluminium polyphosphate hydrate; barium sulfate; zinc 5-nitroisophthalate; calcium strontium phosphosilicate rendered organophilic; zinc phosphate in particular rendered organophilic; zinc molybdate in particular rendered organophilic; modified aluminium polyphosphate; strontium titanate; antimony tin oxide; and molybdenum; said solid inorganic corrosion-inhibiting agent having a nanometric particle size, on the understanding that nanometric particle size means that the mean size, for example the mean diameter (d 50), of the nanometric particles is from 1 to 100 nm, preferably from 5 to 50 nm, more preferably from 10 to 50 nm, better from 10 to 20 nm, the size of the particles being measured by TEM (transmission electron microscopy).