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One of the simplest and most effective fire protection methods for building structures is the application of a fire retardant intumescent coating on the surface of a structure. These swelling (intumescent) type coatings are widely used today. Intumescent coatings can increase the fire resistance of polymer compositions, but they have insufficient chemical resistance, resistance to high humidity. As a result, corrosion pockets appear on the surface of the steel structure and under the coating during long-term operation, the coating peels off, and cracks appear on it, and adhesion decreases. The purpose of this work was to determine the effect of a film-forming substance (binder) on the resistance of intumescent paints to the action of a corrosive atmosphere. For this, intumescent compositions with three different binders were made. The paint composition was applied with a brush to metal plates. For the experiments, samples of St 3 were used. The problem was solved, which was aimed at studying the heat-insulating properties of the studied coatings and the microhardness of metal samples under it. As the main criterion for evaluating the fire retardant properties, the heating time of the metal substrate of the sample was used. It was revealed that three paints obtained satisfactory results and can be used in industry. But epoxy binder paint got better results.

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No abstract

Inner surface of tanks is subject to corrosion due to constant contact with aggressive medium. The greatest danger from the point of view of possible corrosion destruction of steel is water (bottom, lower belts of the tank) and gas-air mixture (roof, upper belt) due to saturation with aggressive components: hydrogen sulfide, carbon dioxide, salts. Failure statistics show that the main reason for the failure of oil tanks (about 70%) is the corrosive wear of the surface that comes into contact with the aggressive medium. The application of paint coatings on the internal surfaces of steel tanks for the storage of oil and oil products is an effective measure to reduce corrosion and increase the life of tanks. However, there are a great many coatings. From the experience of tank operation, paint coatings of the following types were selected to analyze the effectiveness of corrosion protection: XC-717, EP-0020, FL-777, VN-780. To select the paint coating of the inner surface of the tank, physical and mechanical parameters were determined and calculations of the corrosion rate of the tank walls for the above paint coatings were carried out. After physical and mechanical tests, it was established that the best values of the coating are EP-0020. Thus, it is recommended to use a EP-0020 coating as a passive protection of the inner surface to ensure the durability of the tanks.