SU1416460A1 - Frit for producing enamel coating - Google Patents

Abstract

The invention relates to enamel compositions used for corrosion protection of steels operating in an aggressive environment. In order to reduce the firing temperature of a frit coating to obtain an enamel coating it contains: oil: SiOj 50.82-57.04; Tia, j 0.24-0.41; , 4.15-6.92; CaO.6.56-7.03; 10.43-14.82; KjO 0.87-1.46; 13.33-19.99; MgO 0.65-1.08; FejOj 1.43-2.39 "Frit cooking temperature 1000-1100 ° C, firing temperature of the coating 780-820 ° C, firing time 5-7 min. Acid resistance of the coating in 20% HjSO 0.17-0, 40 mg / cm, h, mechanical strength 0.27-0.5 J. 2 tabLo a

Description

05 4 Ed

The invention relates to the composition of enamels used for corrosion protection of steels operating in an aggressive environment (pipelines, bends, tubers and drawers).

The purpose of the invention is to reduce the firing temperature of the coating.

Specific formulations of frits are given in tabLo 1.10.

For the preparation of frits, borax is used, the cullet is glass production waste, and clay of the following composition; oil: SiO 62.71; Tioj

Activated coal 0.5-0.7 Sodium silicate 0.02-0.05

The composition is applied to the degreased metal surface with a thickness of 0.19-0.3 m14 and dried in a drying cabinet at 80-100 ° C for 0.5-1 h and calcined at 780-820 ° C after 5-7 min. In all cases, after firing, the coatings are free from defects.

Coatings obtained on the basis of the proposed compositions have properties that are listed in Table 2, Using the proposed composition, 75; Aljdj 12.6; FSjOj 4.36; CaO 5.6; 15 va improves the quality and core MgO 1.97 | 0.47; 2.65; 8.91; in the following ratio of components, mas%: clay 30-50; glass 40-30; borax 30-20 ..

rozionnuyu resistance enameled products.

Claims (1)

Invention Formula The raw materials are subjected to dry grinding. The mixture is thoroughly mixed and loaded into corundum crucibles. Cooking the frit is carried out in a muffle furnace at 1000-1100 ° C. Cooking time 3.5-4 h. with the following wet grinding in a porcelain mill The slip is prepared in the following composition at 100 May% frit; Chromium oxide 0.3-2.0 Nickel oxide 1.0-2.0 Carboxymethylcellulose0, 04-0.05 Activated coal 0.5-0.7 Sodium silicate 0.02-0.05 The composition is applied to the degreased metal surface with a thickness of 0.19-0.3 m14 and dried in a drying cabinet at 80-100 ° C for 0.5-1 h and calcined at 780-820 ° C after 5-7 min. In all cases, after firing, the coatings are free from defects. Coatings obtained on the basis of the proposed compositions have properties that are listed in Table 2. The use of the proposed composition allows to improve the quality and quality This allows you to improve the quality and rozionnuyu resistance enameled products. Invention Formula The frit for producing an enamel coating, including SiO, TiOj, CaO,,,, is characterized in that, in order to reduce the firing temperature of the coating, it additionally contains MgO and FejjOj with the following ratio five Ponents, masol: SiO TiO Cao Kjo MgO Re, 0h 50.82-57.04 0.24-0.41 4.15-6.92 6.56-7.03 10.43-14.82 0.87-1.46 13.33-19.99 0.65-1.08 1.43-2.39 Table 2 Indicator Acid resistance of frit,% Acid resistance of coating in 20% H2SO4 (mg / cm h) Temperature coefficient of linear expansion of TCLE, C Macrostructure of coating,% Mechanical strength, j. Roasting temperature, ° С Composition 12 - Prototype 0,417,010,2-  0.45 91.15 3.32 0.27 7 € 0-820 0.3 82.57 1,3 0.5 0.40-0.50 0.6-1.0 920