METHOD FOR CORRODED METAL SURFACE PROTECTION AND RECOVERY Russian patent published in 2008 - IPC C09D5/08 C09D5/12 C09D163/02 

FIELD: chemistry.

SUBSTANCE: invention concerns method of protection and recovery of corroded metal surfaces operating in abrasive wear conditions and aggressive media, e.g. in fertiliser transportation, and can be applied in power-producing, chemical and mining industry for rusted equipment repair. Method involves application of primer layer on metal surface with further drying till aftertack, insulation layer with further drying till aftertack, and external layer with further drying to complete hardening. Primer layer is made of composition including the following components, wt %: 20.0-30.0 of epoxy diane resin with epoxy equivalent weight of 450-500, 15.0-25.0 of Versamid 115 polyamide solidifier, 12.0-25.0 of pigments, 12.0-25.0 of fillers, 2.0-5.0 of amine-containing Cardolite NC 562 solidifier based on 3-n pentadecanylphenol, the rest is organic solvents. Insulation layer is made of composition including the following components, wt %: 20.0-35.0 of epoxy diane resin with epoxy equivalent weight of 450-500, 15.0-30.0 of Versamid 115 polyamide solidifier, 5.0-10.0 of fillers, 10.0-50.0 of micaceous iron ore, 2.0-5.0 of amine-containing Cardolite NC 562 solidifier based on 3-n pentadecanylphenol, 0.8-1.2 of structurising additive, the rest is organic solvents. External layer is made of composition including the following components, wt %: 20.0-40.0 of acrylic or polyether hydroxyl-containing resin, 11.0-22.0 of aliphatic isocyanate solidifier, 10.0-20.0 of pigments, 10.0-40.0 of micaceous iron ore, 5.0-10.0 of fillers, 0.2-0.6 of polysiloxane modified organically, 0.8-1.2 of structurising additive, 0.6-2.4 of aluminum powder, the rest is organic solvents. Composition of external layer includes additionally Metatin Catalyst tin dibutyllaurate in amount of 0.05-0.5 wt % as drying accelerator.

EFFECT: enhanced corrosion resistance of coating.

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