METHOD OF ANTI-CORROSION PROTECTION OF CATHODE-POLARIZABLE UNDERGROUND METAL STRUCTURES WITH LAYER OF POLYMER COMPOUND IN INSULATING COATING, POLYMER COMPOUND FOR AN INSULATING COATING OF CATHODE-POLARIZABLE UNDERGROUND METAL STRUCTURES AND USE OF ANIONITE MICROPARTICLES Russian patent published in 2021 - IPC F16L58/12 C08L95/00 C23F13/00 

FIELD: construction, oil and gas industry.

SUBSTANCE: invention can be used in construction and during repairing works of underground metal structures and, preferably, for field, technological and main oil, gas, product pipelines. Method of anticorrosive protection of cathode-polarizable underground metal structures with a polymer layer of mastic compound in an insulating coating consists in cathode polarization from an external direct current source of the metal structure, whereon an insulating coating is preliminarily formed, which adheres to the metal surface on the basis of a primer. Then, the next adhesive bonding anticorrosion layer is formed in the form of a polymer compound. After that, an exterior waterproof coat is developed on it. To form an adhesive binding anticorrosion layer, a polymer compound is used that contains a polymeric thermosetting or thermoplastic binder and a sufficient amount of anionite microparticles in the appropriate ionic form. Preliminarily, the number of anionite microparticles in the appropriate ionic form is determined in the composition of the polymer compound, the ions of which, according to the laboratory test for determining the peeling area of ​​protective coatings during cathodic polarization, can reduce the peeling area relative to the original polymer binder without adding anionite by more than 75%. Once the primer has dried, a flowable polymer compound is applied to it with a layer thickness of 0.5 to 3 mm, with simultaneous application, using a thermoplastic tie layer, of a reinforcing geotextile in the form of a fiberglass mesh. Thereafter, as an exterior waterproof layer, a metal structure, for example a pipeline, is wrapped with a polymeric film material to form an adhesive-adherent insulating polymeric layer compatible with the type of the polymer adjacent to the metal surface to be protected. In case of a thermosetting binder, a fluid high-resistance polymer compound, adhesive-compatible with the polymer-anionite layer, is used to form the exterior waterproof layer. Disclosed are a polymer compound and the use of anionite microparticles in an appropriate ionic form as an additive to the polymer compound.

EFFECT: improved anticorrosive protection of polymeric thermosetting and thermoplastic polymeric coatings by increasing durability of the adhesive bond with the metal surface while leveling the risks of underfilm corrosion under the peeled coating.

5 cl, 2 dwg, 4 tbl