SU682463A1 - Filler for a silicate composition - Google Patents

Description

one

The invention relates to the field of protecting metals from corrosion, repairing damage to a glass-enamel coating, and can be used in factories producing and operating chemical equipment (chemical, petrochemical, metallurgical, and other industries).

Lime composition of enamel containing, wt.%:

SiO258-65

HOSP8-12

Ti023-5

PgOb3-5

K202-7

LijO2- 6

NagO5-12

Pe2Other 3

MnO + NiO-fCoO 2

MgO to a

Saudo 5

Fto 3 in excess of 100% 1.

This composition is not used as a filler in a silicate composition for the repair of enamel coatings.

Closest to the invention is a filler composition of a silicate composition for the repair of enamel coatings, comprising, in wt%:

SiO245-65

AlaOs19-26

1-16

I-10

3-15

0.5- 6

0.5- 6

2-10

0.1-5

2

The main disadvantage of this filler is its low chemical resistance in aggressive environments.

The purpose of the invention is to increase the acid resistance of the coating.

This is achieved by the fact that the filler of the silicate composition for the repair of enamel coatings, including SiO2, MgO, CaO, Na2O, P2O5, 5Oz, also contains Ti02, ZnO, BaO at the following ratio of components, wt.%: Si0257-59

And OZ10,1 - 10.7

MgO5.0-5.3

CaO7.1-7.3

Na2O2,6- 2,8

PsOs5,1- 5,2

SOs5.0-5.1

TU21.0-1.1

ZnO3,1-3,3

BaO2.0-2.2

Specific compositions of the proposed filler are given in table. one.

Table 1DDD coatings oxides are mixed, subjected to heat treatment at

1320 ° C for 3 h, grind the resulting spec and filter out the fraction with a size of 5 particles L 70 microns. Sodium silicofluoride sodium (6%) is added to the obtained fraction and mixed with aqueous sodium silicate (39%).

The composition prepared by the known method K) of the glass-enamel coating is applied for 1.5-2 hours in natural condition (at 20-30 ° C) and then subjected to heat treatment at 100 ° C for 1 hour.

15 Repair compositions on the basis of the described filler compositions have chemical resistance (weight loss at boiling point,%), given in Table. 2-4.

table 2

Weight loss,%

In a 10% solution of acetic acid

Table 3

Weight loss

Claims (2)

Table 4 for 4 hours. Formula of the Invention A filler of a silicate composition for the repair of enamel coatings, including SiOa, ABO3, MgO. CaO, NajO, PaOg, SOa, 5 characterized by the fact that, in order to increase the acid resistance of the coating, it additionally contains TiO2, ZnO, and BaO at the next ratio of components, wt.%: 10 SiOa 57-59 AlaOs 0.1-10 , 7 MgO 5.0- 5.3 6824 3 6 CaO 7.1-7.3 NaaO2.6- 2.8 P2O5 5.1- 5.2 5Oz 5.0- 5.1 TiOs 1.0-1 , 1 ZnO 3.1–3.3 BaO 2.0– 2.2 Sources of information taken into account during the examination 1. USSR author's certificate No. 379545, cl. OZS 5/00, 1968. 2. USSR author's certificate No. 528273, cl. From OZS 7/00, 1974.