RU1807020C - Enamel dross - Google Patents

Abstract

Use: to obtain a primer-free coating on steel and cast iron. The inventive enamel slip contains a frit composition, wt.%: Silicon oxide 38-40 BF SI02, boron oxide 19-22 BF VzOz, alumina 4-7 BF A1gOz, calcium oxide 3-7 BF CaO, sodium oxide 21-24 BF NaaO, iron oxide, 5 BF Rv20z, cobalt oxide 0.4-0.6, BF Co20z, nickel oxide 1.0-1.5 BF N10, ftpr 0.9-2.0 BF F titanium oxide 0.5 -1.8 BF P02, manganese oxide 0.5-1.5 BF Mp02 - YuOmass.h., Clay May 5-6, h., Crystalline drill 0.4-0.6 wt.h., quartz sand 15 m.h., water 45-50 parts by weight, zinc oxide 2.5-4.0 parts by weight, chromium oxide 1.0-1.7 parts by weight, sodium nitrite 0.18-0, 25 parts by weight Coating characteristics: green on steel and cast iron, adhesion strength of 5 points, spall area less than 1%, spreadability 55-75 mm. Coating firing interval 850-900 ° C. 3 tab.

Description

The invention relates to a technology for the preparation of enamel slips and can be used to obtain an uncoated coating of steel and cast iron.

The purpose of the invention is to obtain a greenless coat of green on steel and cast iron, and to reduce the firing temperature.

The frit is prepared using the following technology.

Charge materials: quartz sand, industrial borax, quartz-feldspar raw materials, soda ash, sodium nitrate, potassium fluorite, cobalt oxide, nickel oxide are thoroughly mixed in a paddle mixer for 1B min, Frit is smelted in a rotary kiln at 1250- 1270 ° C for 150 minutes, then poured for granulation into cold running water.

For the preparation of enamel slip in a wet ball mill load specified in the proposed composition

components and grind to a fineness of grinding 12-20 units. along the vessel Lysenko (Azarov method), specific gravity 1.67-1.74 g / cm3.

The resulting enamel slip is applied to steel and cast iron products by known methods. After glazing, the articles are dried and calcined in an electric furnace for continuous burning of enamels for 3-5 minutes in the temperature range of 850-900 ° C.

Enamel creates a green surface on products without defects and provides sufficient adhesion to steel and cast iron.

The compositions of enamel slips are given in table 1.

As the frit, the compositions shown in Table 2 can be used.

The properties of the compositions and coatings based on them are shown in Table 3.

The developed enamel slip compositions are green at a low rate

(L

WITH

with

about VI

o to o

melting point, have sufficient adhesion to steel and cast iron. Enamel combines at the same time the functions of cover and soil, which significantly increases the performance and durability of the product.

Claims (1)

The claims Frit Enamel Slip composition, wt.%: SI02 38-40; VaOz 19-22; A120z 4-7; CaO 3-7; 21-24; Re203 2.95, 5; Co20z 0.4-0.6; NiO 1.0-1.5; F1 0.9-2.0; TiOa 0.5-1.8, Mn02 0.5-1.5, clay, silica sand, crystalline drill and water, characterized in that, in order to obtain a greenish coat of green color on steel and cast iron, to reduce the firing temperature, it additional contains zinc oxide, chromium oxide and sodium nitrite, in the following ratio of components, parts by weight: frit 100, clay 5-6; silica sand 15, crystalline drill 0.4-0.6; water 45-50, zinc oxide 2.5-4.0; chromium oxide 1.0-1.7, sodium nitrite 0.18-0.25. Table 1 table 2