METHOD OF OBTAINING PROTECTIVE COATING ON SURFACE OF METAL PRODUCT, OPERATING UNDER CONDITIONS OF HIGHLY AGGRESSIVE MEDIUM, HIGHER TEMPERATURES AND ABRASIVE IMPACT

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to a method of obtaining a coating for the protection of metal surfaces of oil-field and chemical equipment, operating under conditions of a highly aggressive medium, higher temperatures and abrasive impact, against corrosion and salt-and-paraffin sediments. The method consists in the application of a lower layer of the coating in the form of a solution of a mixture of glycidoxypropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane, taken in a ratio from 2:1 to 1:2 with the concentration of silanes in the solution from 1 to 10 wt %, on the surface of a metal product, thermal processing of the product at a temperature of 110-115°C for 10-15 minutes, sputtering a powder composition, in which as the inorganic filling agent used is an inorganic filling agent with the Knoop hardness of 1200 and higher, with the following component ratio, wt %: polyphenylene sulphide 30-94, polyterafluoroethylene 1-40, the said inorganic filling agent 5-30, after which the product with the applied coating is subjected to thermal processing at a temperature of 340-370°C for 10-15 min, after which an upper layer of the coating, based on a (3,3,3-trifluoropropyl)methyldichlorosilane solution with the concentration of silane in the solution from 1 to 10 wt %, is applied, the product is subjected to thermal processing at a temperature of 110-115°C for 10-15 min.;EFFECT: increase of the corrosion resistance, adhesive properties and reduction of salt-and-paraffin sediments.;4 cl, 5 tbl