SU739015A1 - Acid-resistant enamel - Google Patents

Description

The invention relates to the field of enamel coating and can be used to protect steel products from corrosion damage. The known composition of the enamel containing wt.%: SiOg 40,5-50,6; 6.9-12; BjOj 20.5-26.5; 12.5-20.6; KgO 0.7-2; CaF 1-7,2; MnO 0.7-10; CoO 0.6-1.6; NiO O, 5-0.6; metal chloride 0.1–5 u. To obtain a coating, a slip of a complex composition is used, which increases the cost of the coating. The closest is the composition of enamel containing wt.%: SiOg -58.08; BgO -4,4; APgOj - 2.65; - 2.7; Naj, 0 - 13.31; CaO - 2.4; NagSiF -3.36; - 0.71; TiO -2,1; CaF -4.15; Ug-O - 3.9; 5rO-l, 5; O, 74 2 The disadvantage of this enamel is that the resulting coating has low heat resistance (from 200 to 25 ° C) and insufficient chemical resistance (leachability in 20% HC1 solution for 8 hours, 2 mg). The object of the invention is to increase the heat resistance and acid resistance of the coating. It is achieved by the fact that enamel is resistant to water, including SiOg, VLO, KgO, CaO, oxides of Ni Co, as oxides of Ni and Co contains Nio and CoO, and additionally contains CaMg 0 in the following ratio of wt.%: 61-67 11-16 1.6 - 1.7 3-5.2 0.6-1.2 0.6 -1-, 2 2.8 -7 C VlgSig, .1 -5 Sand, boric acid (GOST) are used as precursors for the preparation of enamel. 5281-50), carbon dioxide P1, 1st potassium (GOST 2156-52), sodium carbonate (GOST 2156-52), carbon dioxide, tium (NPTU 2277-49), kob zlta oxide {CMTU 2144-49), nickel oxide (VTU GIK 3-51) and the mineral diopside CaMg Sn O. Diopside widely found in nature mineral Before “introduction to the charge it is necessary to grind it beforehand.

The preparation of the formulation is carried out in the following manner.

These components of the dispenser are mixed and melted in an oven at a temperature of 1260-12 ° C for 1.8-2.0 hours.

The melted mass is poured into a bath of running water to obtain an enamel frit, then dried, crushed with the introduction of suspending agents and applied to the product as a suspension.

The suspension is prepared from the following components, wt.%:

Enamel Frit100

Clay

A mole of an enamel frit, defined by a sediment of 0.9-1.2 cm in a Lysenko vessel, Schlicker is dipped onto the product by dipping and dried with compressed air. The product with the dried coating is placed in an oven, where it is calcined at a temperature of 880-900С within minutes.

The compositions of enamels presented in Table 2 were prepared and tested. one.

The described compositions have the properties shown in Table. 2,

The described enamel has the following advantages in comparison with the known one:

- provides acid-resistant coatings without prior application of the soil, which significantly reduces the complexity and cost of the process;

- the coating formed by enamel has increased acid resistance and heat resistance, which allows the formula from acid to acid enamel, including 6iOg, BgO,, KgO, CaO., N | H Co oxides, characterized in that in order to increase heat resistance and acid resistance, it contains hjiO and CoO as Ni and Co oxides and additionally contains CaMgSio 0 with the following ratio of components, wt.%: SiO 61-67 BoOi7-8 7 11-16 1.6-1, 7 3-5,2 2.8-7.0 0,6-1,2 0.6-1,2 CaNlgf Sig 0.1-5.0 Sources of information that are of particular interest in the examination of I. USSR author's certificate 391081, cl. From 03 to 7/04, 1970. 2. TU 26.01-449-72.

Claims (1)

Claim Acid-resistant enamel, including 6i0g, BgO ^, NagO, K ₂ 0, CaO, LigO, NIh Co oxides, characterized in that ₅ , in order to increase heat resistance and acid resistance, it contains ΝίΟ and CoO as oxides M and Co and, in addition, contains CaMgSig 0 ^ in the following ratio of components, wt.%: s SiOfc 61-67 7 — S