RU1813075C - Enamel slip - Google Patents

Abstract

SUMMARY OF THE INVENTION: an enamel slurry contains a frit composition, wt.%: Silicon oxide 19-25 BF SiCte; alumina 2-5 BF AlaOa; boron oxide 10-15 BF BaOz: zirconium oxide fS-20 BF ZrOa; sodium oxide 13-15 BF NaaO; barium oxide 1-3 BF BaO; calcium oxide 2-4 BF CaO; zinc oxide 10-15 BF ZnO; calcium fluoride 8-10 BF CaP2; cryolite 2-44 BF 100m.h., quartz sand 0.2-0.4 m.h., bischofite 0.3-0.5 wt.h. (dry matter), water 20-30 wt.h. The disclosed composition improves the manufacturability of the slip and reduces the cost of preparing it. 2 tab.

Description

The invention relates to the protection of metals against corrosion and can be used to coat metal products.

The aim of the invention is to improve the manufacturability of the enamel slip and reduce the cost of its preparation.

This goal is achieved by the fact that in the proposed composition the clayless enamel slip contains frit, quartz sand, bischofite and water.

The proposed clay-free enamel slip has the following composition, parts by weight:

Frit100

Quartz sand 0.2 - 0.4

Bischofite (dry matter)

Water

To obtain a slip frit of the following composition, wt.%:

SI0219-25

0.3-0.5 20 - 30 used

Zroa

CaO

Nasaife

AO3

NaaO

Zno

B20z

Wow

CaP2

15-20

2-4

2-4

2-5

13-15

10-15

10-15

1-3

8-10

With

The selected frit for the enamel slurry allows the performance values presented by A.C. No. 1590457, 1988 to be maintained.

The compositions of the slip are given in table. 1.

It was found that as a result of the interaction of magnesium chloride, which is part of bischofite (77% MgCia) and quartz sand with a frit containing Zr02, a composition is formed that has binding properties that provide the necessary slip plasticity and adhesion to the substrate.

Sd

Bmshofit GOST 7759 - 73 in its composition contains the following salts in wt.% In 1 liter of water:

CaCl27.42 KCI 0.02

VG2.0,1

MgCla77.55 CaCO3 0.05 CaS04 1.07 The proposed enamel coating has no defects and retains all the service characteristics corresponding to OST 26-01-1-85 (see Table 2).

According to the proposed method, an acid-alkali-resistant zirconium enamel frit was used to prepare a slip. Quartz sand (GOST 2138-84) Bischofite (GOST 7759-73) Example .1. An enamel slip was prepared from zirconium enamel frit and binders (silica sand and bischofite). The composition of the slip, wt.h .:

Frit100. . Quartz sand 0.2 Bischofite (dry matter) 0.3 Water 20 The constituent components were loaded into a ball mill and crushed to a fineness of 10-12 units. (along the Lisenko vessel, Azarov method). The prepared slip was applied to primed steel samples and dried. Burned at a temperature of 720 ° C. Acid resistance and alkali resistance, mechanical strength, heat resistance were determined according to OST 26-01-1-85. Properties of the resulting coating. Acid resistance, mg / cm2 0.02. Alkali resistance, mg / cm2 - 0.18 Heat resistance, ° С 420 Mechanical impact strength, J 4.0.

Example 2. An enamel slip was prepared analogously to example 1. The composition of the slip, parts by weight:.

Frit100 Quartz sand 0.30 Bischofite (dry matter) 0.40 Water 25 Calcination was carried out at a temperature of 750 ° C. The properties of the resulting coating were determined according to OST 26-01-1-85.

Acid resistance, mg / cm2 0.025 Alkali resistance. mg / cm2 0.15

4.1

Heat resistance, ° С415 Mechanical impact strength, J

Example 3. An enamel slip was prepared analogously to example 1. The composition of the slip, wt.h .:

Frit100 Quartz sand 0.40 Bischofite (dry matter) 0.50 Water 30 Firing was carried out at a temperature of 800 ° C. The properties of the obtained coating were determined according to OST 26-01-1-85: Acid resistance, mg / cm 0.04 Alkali resistance, mg / cm2 0.22 Heat resistance, ° C 400 Mechanical impact strength, J 3.8 From the data given in the table . 2, it is seen that the most technologically advanced slip compositions in parts by weight of within the temperature range 720-800 ° С

Frit. Silica sand LL 0.2-0.4 Bischofite (dry matter) 0; 3-0.5 Water. 20-30 Thus, the proposed enamel slurry composition allows the use of low-cost natural material containing the salt reserve necessary for preparing the slurry. Bischofite contains water necessary for the preparation of a slip, reduces energy costs for grinding, scarce material - clay is not used in our invention, and a clay-free slip is recommended for a wide range of purposes regarding the type and size of enameled steel parts.

F o rmul izobret n and Enamel slip, including the frit composition, wt.%: 5Yu2 19-25: A 20z2-5; BaOz 10-15; Zr02 15-20: Na20 13-15; BaO 1-3; CaO 2-4; ZnO 10-15; CaF2 8-10; No. 3B Rb2-4, an additive based on magnesium chloride and water, characterized in that, in order to improve the technological preparation of the slurry and reduce the cost of its preparation, it contains bischofite and additionally quartz sand as an additive, in the following ratio of components, parts by weight;, Specified frit 100

Bischofite 0.3-0.5 Water 20-30 Quartz sand 0.2-0.4.

Table 1 Comparative data on the composition of slurries, May. hours

table 2

Continuation of the table. 2