SILICATE ENAMEL COATING FOR INTERNAL PROTECTION OF STEEL PIPELINES Russian patent published in 2022 - IPC C03C8/06 

FIELD: oil industry; petrochemical industry.

SUBSTANCE: invention relates to the field of protection of inner surface of steel pipelines from corrosion wear; it can be used in the oil and petrochemical industry for the transportation of aggressive media. Silicate enamel coating for internal protection of steel pipelines, including SiO₂, B₂O₃, Na₂O, K₂O, Li₂O, TiO₂, Na₃AlF₆, MnO₂, CoO, CuO, contains components at the following ratio, wt.%: SiO₂ 55.0-58.5; В₂O₃ 10.0-11.8; Na₂O 10.0-11.8; K₂O 1.0-1.8; Li₂O 3.8-4.5; TiO₂ 3.7-4.5; Fe₂O₃ 0.8-1.5; Al₂O₃ 3.0-3.5; Na₃AlF₆ 2.3-3.0; MnO₂ 1.8-2.3; Co₂O₃ 0.8-1.2; CuO 0.3-0.8; CaO 0.3-1.0; MgO 0.3-0.4; SO₃ 0.1-0.3, wherein following oxides were introduced by the Chernoyarsk deposit diatomite, wt.%: SiO₂ 31.7-36.2, Al₂O₃ 3.0-3.5, Na₂O 0.1-0.5, K₂O 0.5-1.5, Fe₂O₃ 0.8-1.5, CaO 0.3-1.0, MgO 0.3-0.4, SO₃ 0.1-0.3.

EFFECT: increase in the corrosion resistance of silicate enamel coating, adhesion strength in the steel-enamel composition, and formation of a smooth defect-free surface.

1 cl, 5 ex, 1 tbl, 5 dwg