SU1715726A1 - Frit for the ground enamel - Google Patents

Abstract

The invention relates to the anticorrosion protection of steel products of household, chemical and gas equipment. In order to increase the strength of adhesion to the substrate and reduce the price, the Frit for the soil enamel, when applied to the substrate without etching, contains the following components, wt%: SI02 45-52; CaO 12-16; Na20 22-24; B203 6.5-10; 0.1-3.4; ReaOz 0.1-2.4; MDO 1.0-1.6; N10 0.8-2.7. The firing temperature of the coating is 795-820 ° C. impact strength 0,125-0,13 mgm. 2 tab.

Description

The invention relates to the production of enamels for anticorrosive protection of household products, chemical and gas equipment.

The purpose of the invention is to increase the strength of adhesion to the substrate and reduce the cost.

The invention is illustrated by the specific examples given in Table 1.

For the preparation of frits, for example, composition 2 (based on 100 kg of frits), 33.3 kg of TPP ash are used to inject the total amount of CaO and MgO and partially SI02. NaaO. For the introduction of the remaining required oxides, the following raw materials of the grade h and h are used. kg;

SI02 (quartz sand)

Na20 (soda

calcined)

B20z (borax)

NIO (nickel oxide)

Rv20z (iron oxide)

 (alumina)

34.2

12.8

43

2.1

2.4

3.4

The injected ash of thermal power plants (Baltic Thermal Power Plant) includes May. %: SI02 36.2 ± 2; Na2O

2.2 ± 0.4; CaO 51.2 ± 3; MDO 3.9 ± 0.3; ppt 6.5 ± 0.5. ,

After preliminary thorough mixing of the charge materials, the frit is cooked in refractory crucibles at 1200-1300 ° C for 1-2 hours until full melting, followed by granulation with water.

The slip is prepared according to the following formulation, parts by weight:

Frit100

Clay5

Water42

The finished slip is applied by known methods to chemically degreased steel substrates without their prior pickling and, after drying, is burned in a muffle furnace at 795-810 ° C for 2.5-3.5 minutes.

The properties of specific compounds are given in table 2.

The use of soil enamel frit allows to significantly reduce material costs (by 30-40%) with a good bond 4

ate

1 with a substrate without pre-etching.

Formulas of the Invention Frit for soil enamel preferably for application to substrates without etching them, including SlOa. CaO, NaaO, VgOz, A120z, MdO, ReaOz, NIQ, o tl and h

Schi and so. that, in order to increase the strength of adhesion to the substrate and reduce the cost, it contains these components in the following amounts, wt.%: SlOa 45-52; CaO 12-16: MagO 22-24; B203 6.5-10; 0.1-3.4; MDO 1.0-1.6; RV203 0.1-2.4; NIO 0.9-2.7.

Table 1

table 2

Claims (1)

Claim Frit for ground enamel mainly for application to substrates without their 5 etching, including SIO2, CaO, No. gO, BrOz, AI2O3. MdO, BegOz, NIO, and with the fact that, in order to increase the adhesion to the substrate and reduce the cost, it contains these components in the following amounts, wt.%: SIO2 45-52; CaO 12-16: N820 22-24; In 0z ₂ 6,510; AI2O3 0.1-3.4; MgO 1.0-1.6; RunOz 01-2.4; N10 0.9-2.7. Table 1 Component Content Components, May. %, in the compositions 1 2 3 4 SIO2 45 48.2 51.9 52 CaO 16 fifteen 12 thirteen N'820 22 23.7 24 23 B2O3 6.9 7 10 6.5 AI2O3 3.4 1.6 0.1 1,5 TagOz 2,4 1.2 0.1 1.5 MDO 1,6 1.2 1,0 1.5 . N10 2.7 2.1 0.9 1,0 T aL) l and a 2 Properties Compositions 1 2 3 4 Prototype Firing temperature, ° C 810 795 820 810 760-780 ha, min Strength at 2.5 3 3 3 4 impact, kg <m 0.125 0.13 0.125 0.125 0.10-0.12