SU1135727A1 - Enamel for corrosion protection of copper - Google Patents

Abstract

ENAMEL FOR ANTI-CORROSION PROTECTION, including barium, copper, sodium and phosphorus compounds, characterized in that, in order to increase acid and water resistance, it contains Ba (P05) 2, CulPOjlj, as compounds of barium, copper, sodium and phosphorus, ) JPri with the following ratio of components, May.%: Ba (PO.) 2 89.5-94.5 Cu (PO24.7-4.9 Na (PO,)

Description

This invention relates to vitreous coatings used as anticorrosive protective metal films. Known composition of the enamel, containing 101 wt.%: PHO 15-30; Na, 0 2-5; KgO 1-3 VgOz - 5-20; CuO 5-20; PjOjAO65 tl. The disadvantage of this composition is high temperature and toxicity. The closest to the invention is the enamel composition for anticorrosion copper reserves, containing, ng: RdOu C-AB; BaO 34.5-34.8; Na, About 15.5-16.2; 2.4-2.5; CuO 1.73-1.79; Fe2.0 0.45-0.52 zj. The coating contains a significant amount of oxides of alkali metals; thalls, in its composition, are toxic and, to a large extent, toxic oxide of thallium, have insufficient chemical resistance (weight loss during the installation of 8 water to 6.1%, in 2N. HCS 45% K the invention is novel acid and water resistance. The object is achieved in that the enamel for anticorrosive protection of copper, including barium, copper, sodium and phosphorus compounds, contains barium, copper, sodium and phosphorus compounds) and, CuCPOj), Na (POj with the following ratio of ingredients, Ba (ROE) 2 89.5-94.5 Sc (RD) g 4.7-4.9 At (RDF) at 0.8-5.6 Preliminary, according to well-known methods, vitreous components are obtained — barium polyphosphate barium (copper polyphosphate CuCPOjjj Crystal Scalable component - cyclic trim, sodium taphosphate (NaPOj) is produced by the interaction of sodium hydrogen phosphate and ammonium nitrate at 310320 0 according to the method of Carbe and Yander. The components are crushed, mixed and melted at 800-850 s. The melt is subjected to sharp quenching by pouring out into a metal plate. Rmal is deposited on copper using the well-known Schicker technology, i.e. they are crushed, shut off with a small amount of water to a pastelike consistency, the paste is applied onto the prepared metal by hand - with a brush or sprayed with a teepiM device, drying system: 1 out and put on sintering. Sintering is carried out at 780-800C, the exposure time depends on the dimensions of the furnace space and the mass of the product. On average, it is 0.5-1 minutes. Predpagae a te enamel compositions are given in tabd .; . properties of coatings obtained on their basis - in, 2. The use of the proposed. The composition will allow to obtain a non-toxic dense 1UN1n 1This is of good quality. Table 189.5 292.0 394.5 Table 2

Characteristic Transparent, with a golden hue, without cracks, possible individual coatings, point inclusions of bubbles, metal textures are clearly visible through the coatings

Coefficient of thermal expansion in the range of 15200С, degree H 14

P8

120

SUSTAINABLE% EVENING

Coating in boiled water

Chemical resistance determined by powder (Turner), X

Mass loss op 11111 cheshv1, water

2n.nse

2n.KaON

TerM (Я91клиро

bath (700-20 C)

Protective ci-prnas gas and gas corrosion, to C

briefly

(2-3 hours)

for a long time (more than 30 hours)

1135727 "

Continued table. 2

Steadily

0.6

0.8

0.3 0.1 7.6 5.1 Decompose

26

thirty

700

300

Claims (1)

ENAMEL FOR ANTI-CORROSION PROTECTION OF COPPER, including compounds of barium, copper, sodium and phosphorus, characterized in that, in order to increase acid and water resistance, 'it contains Ba (PO ₅ ) 2, Cu as compounds of barium, copper, sodium and phosphorus (P0 _e ) ₂ , Na (P0j) _} npH in the following ratio of components, May.%: Ba (PO ₃ ) ₂ 89.5-94.5 Cu (POj) ₂ 4.7-4.9 Na (POj) ₃ ί 0.8-5.6 SU „„ 1135727